diff --git a/.env.dev b/.env.dev
index 37b509b5..4c463ee3 100644
--- a/.env.dev
+++ b/.env.dev
@@ -1,5 +1,4 @@
 MAFIASI_DEBUG=True
-MAFIASI_ENABLE_JABBER_INTEGRATION=False
 MAFIASI_ENABLE_LDAP_AUTH_BACKEND=False
 MAFIASI_ENABLE_LDAP_REGISTRATION=False
 MAFIASI_ENABLE_EP_INTEGRATION=False
diff --git a/.env.test b/.env.test
index 2233b2c0..5f4fae38 100644
--- a/.env.test
+++ b/.env.test
@@ -1,6 +1,5 @@
 MAFIASI_DEBUG=True
 MAFIASI_TESTING=True
-MAFIASI_ENABLE_JABBER_INTEGRATION=False
 MAFIASI_ENABLE_LDAP_AUTH_BACKEND=False
 MAFIASI_ENABLE_LDAP_REGISTRATION=False
 MAFIASI_ENABLE_MUMBLE_INTEGRATION=False
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e742a681..382f3cc3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,6 +30,7 @@ jobs:
         run: pip install pipenv
       - name: install project dependencies
         run: |
+          sudo apt update
           sudo apt install -y --no-install-recommends libgpgme-dev libsasl2-dev libldap2-dev libmagic-dev libjpeg-dev libgraphviz-dev gettext
           pipenv sync --dev
       - name: run tests
@@ -47,6 +48,7 @@ jobs:
         run: pip install pipenv
       - name: install project dependencies
         run: |
+          sudo apt update
           sudo apt install -y --no-install-recommends libgpgme-dev libsasl2-dev libldap2-dev libmagic-dev libjpeg-dev libgraphviz-dev gettext
           pipenv sync --dev
       - name: compile i18n messages
diff --git a/Dockerfile b/Dockerfile
index 493bb6c2..193b4804 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -26,8 +26,7 @@ ADD . /app/src
 # Put configs in appropriate locations
 RUN cp docker/nginx.conf /etc/nginx/sites-enabled/default && \
     cp docker/uwsgi.ini /etc/uwsgi/mafiasi-dashboard.ini && \
-    cp docker/supervisor.conf /etc/supervisor/conf.d/app.conf && \
-    touch /app/config/jabber_cert_fingerprint
+    cp docker/supervisor.conf /etc/supervisor/conf.d/app.conf
 
 RUN mkdir -p /app/static/mathjax
 RUN cp -rT /usr/share/javascript/mathjax /app/static/mathjax
diff --git a/Pipfile.lock b/Pipfile.lock
index 23b78ed7..5b3e91b3 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -37,11 +37,11 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:0f0d56dc5a6ad56fd4ba36484d6cc34451e1c6548c61daad8c320169f91eddc7",
-                "sha256:c6c2e98f5c7869efca1f8916fed228dd91539f9f1b444c314c06eef02980c716"
+                "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082",
+                "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==2023.5.7"
+            "version": "==2023.7.22"
         },
         "cffi": {
             "hashes": [
@@ -114,109 +114,113 @@
         },
         "charset-normalizer": {
             "hashes": [
-                "sha256:04afa6387e2b282cf78ff3dbce20f0cc071c12dc8f685bd40960cc68644cfea6",
-                "sha256:04eefcee095f58eaabe6dc3cc2262f3bcd776d2c67005880894f447b3f2cb9c1",
-                "sha256:0be65ccf618c1e7ac9b849c315cc2e8a8751d9cfdaa43027d4f6624bd587ab7e",
-                "sha256:0c95f12b74681e9ae127728f7e5409cbbef9cd914d5896ef238cc779b8152373",
-                "sha256:0ca564606d2caafb0abe6d1b5311c2649e8071eb241b2d64e75a0d0065107e62",
-                "sha256:10c93628d7497c81686e8e5e557aafa78f230cd9e77dd0c40032ef90c18f2230",
-                "sha256:11d117e6c63e8f495412d37e7dc2e2fff09c34b2d09dbe2bee3c6229577818be",
-                "sha256:11d3bcb7be35e7b1bba2c23beedac81ee893ac9871d0ba79effc7fc01167db6c",
-                "sha256:12a2b561af122e3d94cdb97fe6fb2bb2b82cef0cdca131646fdb940a1eda04f0",
-                "sha256:12d1a39aa6b8c6f6248bb54550efcc1c38ce0d8096a146638fd4738e42284448",
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-            "markers": "python_full_version >= '3.7.0'",
-            "version": "==3.1.0"
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+                "sha256:f87f746ee241d30d6ed93969de31e5ffd09a2961a051e60ae6bddde9ec3583aa"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==3.2.0"
         },
         "cryptography": {
             "hashes": [
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             ],
             "markers": "python_version >= '3.7'",
-            "version": "==41.0.1"
+            "version": "==41.0.2"
         },
         "cryptojwt": {
             "hashes": [
@@ -258,11 +262,11 @@
         },
         "django-auth-ldap": {
             "hashes": [
-                "sha256:6d18e747e1d9680360357945b03e0d16a3f50feea94176e2552f29ccf8c2973c",
-                "sha256:788b5b1ee70054681d7fae7d085deaa76f2fa6f64cc9fe3dd79daef62c2f6121"
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             "index": "pypi",
-            "version": "==4.3.0"
+            "version": "==4.4.0"
         },
         "django-cache-url": {
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@@ -470,11 +474,11 @@
         },
         "marshmallow": {
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-            "markers": "python_version >= '3.7'",
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+            "markers": "python_version >= '3.8'",
+            "version": "==3.20.1"
         },
         "nameparser": {
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@@ -680,45 +684,45 @@
         },
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-            "version": "==1.10.9"
+            "version": "==1.10.12"
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         "pygpgme": {
             "hashes": [
@@ -783,101 +787,101 @@
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@@ -900,11 +904,11 @@
                 "django"
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@@ -931,19 +935,19 @@
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+                "sha256:f779d3ad205f108d14e99bb3859aa7dd8e9c68874617c72354d7ecaec2a054ac",
+                "sha256:f87f746ee241d30d6ed93969de31e5ffd09a2961a051e60ae6bddde9ec3583aa"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==3.2.0"
         },
         "click": {
             "hashes": [
-                "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e",
-                "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"
+                "sha256:48ee849951919527a045bfe3bf7baa8a959c423134e1a5b98c05c20ba75a1cbd",
+                "sha256:fa244bb30b3b5ee2cae3da8f55c9e5e0c0e86093306301fb418eb9dc40fbded5"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==8.1.3"
+            "version": "==8.1.6"
         },
         "freezegun": {
             "hashes": [
@@ -1221,27 +1222,27 @@
         },
         "pathspec": {
             "hashes": [
-                "sha256:2798de800fa92780e33acca925945e9a19a133b715067cf165b8866c15a31687",
-                "sha256:d8af70af76652554bd134c22b3e8a1cc46ed7d91edcdd721ef1a0c51a84a5293"
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             ],
             "markers": "python_version >= '3.7'",
-            "version": "==0.11.1"
+            "version": "==0.11.2"
         },
         "platformdirs": {
             "hashes": [
-                "sha256:0ade98a4895e87dc51d47151f7d2ec290365a585151d97b4d8d6312ed6132fed",
-                "sha256:e48fabd87db8f3a7df7150a4a5ea22c546ee8bc39bc2473244730d4b56d2cc4e"
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             ],
             "markers": "python_version >= '3.7'",
-            "version": "==3.5.3"
+            "version": "==3.10.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159",
-                "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"
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             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==1.0.0"
+            "markers": "python_version >= '3.7'",
+            "version": "==1.2.0"
         },
         "py": {
             "hashes": [
@@ -1285,49 +1286,49 @@
         },
         "pyyaml": {
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+                "sha256:81e0b275a9ecc9c0c0c07b4b90ba548307583c125f54d5b6946cfee6360c733d",
+                "sha256:9046c58c4395dff28dd494285c82ba00b546adfc7ef001486fbf0324bc174fba",
+                "sha256:9eb6caa9a297fc2c2fb8862bc5370d0303ddba53ba97e71f08023b6cd73d16a8",
+                "sha256:a0cd17c15d3bb3fa06978b4e8958dcdc6e0174ccea823003a106c7d4d7899ac5",
+                "sha256:afd7e57eddb1a54f0f1a974bc4391af8bcce0b444685d936840f125cf046d5bd",
+                "sha256:b1275ad35a5d18c62a7220633c913e1b42d44b46ee12554e5fd39c70a243d6a3",
+                "sha256:b786eecbdf8499b9ca1d697215862083bd6d2a99965554781d0d8d1ad31e13a0",
+                "sha256:ba336e390cd8e4d1739f42dfe9bb83a3cc2e80f567d8805e11b46f4a943f5515",
+                "sha256:baa90d3f661d43131ca170712d903e6295d1f7a0f595074f151c0aed377c9b9c",
+                "sha256:bc1bf2925a1ecd43da378f4db9e4f799775d6367bdb94671027b73b393a7c42c",
+                "sha256:bd4af7373a854424dabd882decdc5579653d7868b8fb26dc7d0e99f823aa5924",
+                "sha256:bf07ee2fef7014951eeb99f56f39c9bb4af143d8aa3c21b1677805985307da34",
+                "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43",
+                "sha256:c8098ddcc2a85b61647b2590f825f3db38891662cfc2fc776415143f599bb859",
+                "sha256:d2b04aac4d386b172d5b9692e2d2da8de7bfb6c387fa4f801fbf6fb2e6ba4673",
+                "sha256:d858aa552c999bc8a8d57426ed01e40bef403cd8ccdd0fc5f6f04a00414cac2a",
+                "sha256:f003ed9ad21d6a4713f0a9b5a7a0a79e08dd0f221aff4525a2be4c346ee60aab",
+                "sha256:f22ac1c3cac4dbc50079e965eba2c1058622631e526bd9afd45fedd49ba781fa",
+                "sha256:faca3bdcf85b2fc05d06ff3fbc1f83e1391b3e724afa3feba7d13eeab355484c",
+                "sha256:fca0e3a251908a499833aa292323f32437106001d436eca0e6e7833256674585",
+                "sha256:fd1592b3fdf65fff2ad0004b5e363300ef59ced41c2e6b3a99d4089fa8c5435d",
+                "sha256:fd66fc5d0da6d9815ba2cebeb4205f95818ff4b79c3ebe268e75d961704af52f"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==6.0"
+            "version": "==6.0.1"
         },
         "requests": {
             "hashes": [
@@ -1339,11 +1340,11 @@
         },
         "responses": {
             "hashes": [
-                "sha256:8a3a5915713483bf353b6f4079ba8b2a29029d1d1090a503c70b0dc5d9d0c7bd",
-                "sha256:c4d9aa9fc888188f0c673eff79a8dadbe2e75b7fe879dc80a221a06e0a68138f"
+                "sha256:5d5a2ce3285f84e1f107d2e942476b6c7dff3747f289c0eae997cb77d2ab68e8",
+                "sha256:9d49c218ba3079022bd63427f12b0a43b43d2f6aaf5ed859b9df9d733b4dd775"
             ],
             "index": "pypi",
-            "version": "==0.23.1"
+            "version": "==0.23.2"
         },
         "six": {
             "hashes": [
@@ -1363,18 +1364,18 @@
         },
         "types-pyyaml": {
             "hashes": [
-                "sha256:662fa444963eff9b68120d70cda1af5a5f2aa57900003c2006d7626450eaae5f",
-                "sha256:ebab3d0700b946553724ae6ca636ea932c1b0868701d4af121630e78d695fc97"
+                "sha256:7d340b19ca28cddfdba438ee638cd4084bde213e501a3978738543e27094775b",
+                "sha256:a461508f3096d1d5810ec5ab95d7eeecb651f3a15b71959999988942063bf01d"
             ],
-            "version": "==6.0.12.10"
+            "version": "==6.0.12.11"
         },
         "urllib3": {
             "hashes": [
-                "sha256:48e7fafa40319d358848e1bc6809b208340fafe2096f1725d05d67443d0483d1",
-                "sha256:bee28b5e56addb8226c96f7f13ac28cb4c301dd5ea8a6ca179c0b9835e032825"
+                "sha256:8d22f86aae8ef5e410d4f539fde9ce6b2113a001bb4d189e0aed70642d602b11",
+                "sha256:de7df1803967d2c2a98e4b11bb7d6bd9210474c46e8a0401514e3a42a75ebde4"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==2.0.3"
+            "version": "==2.0.4"
         }
     }
 }
diff --git a/README.md b/README.md
index 74dd2b45..66127a0a 100644
--- a/README.md
+++ b/README.md
@@ -25,15 +25,6 @@ pipenv run ./manage.py migrate
 make
 ```
 
-If you want to use jabber (ejabberd), you have to load the SQL schema
-into the database (you'll find it in the ejabberd source code),
-migrate the jabber database and do some changes to the tables
-```
-psql jabber < ejabberd-source-code/sql/pg.sql
-./manage.py migrate --database jabber
-psql jabber < mafiasi/jabber/sql/*.sql
-```
-
 We try to keep these installation instructions up to date, but we can't
 guarantee.
 
diff --git a/locale/de_DE/LC_MESSAGES/django.po b/locale/de_DE/LC_MESSAGES/django.po
index cc5bbbc0..fbac592e 100644
--- a/locale/de_DE/LC_MESSAGES/django.po
+++ b/locale/de_DE/LC_MESSAGES/django.po
@@ -4,15 +4,15 @@ msgstr ""
 "Project-Id-Version: Mafiasi\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2023-01-18 14:54+0100\n"
-"PO-Revision-Date: 2023-01-18 14:58+0100\n"
-"Last-Translator: Markus Neblung <markus.neblung@uni-hamburg.de>\n"
+"PO-Revision-Date: 2023-07-27 20:41+0200\n"
+"Last-Translator: Timon Engelke <timon.engelke@uni-hamburg.de>\n"
 "Language-Team: \n"
 "Language: de_DE\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
-"X-Generator: Poedit 3.2.2\n"
+"X-Generator: Poedit 3.0.1\n"
 
 #: mafiasi/base/middleware.py:15
 msgid ""
@@ -376,6 +376,18 @@ msgstr "PDF hochladen"
 msgid "Reminder: Memory minutes for \"%(coursename)s\""
 msgstr "Erinnerung: Gedächtnisprotokoll für \"%(coursename)s\""
 
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:33
+msgid "Block this Gprot"
+msgstr "Dieses GProt blockieren"
+
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:34
+msgid ""
+"When a Gprot is blocked, a hash is saved that ensures that the same file "
+"cannot be uploaded again."
+msgstr ""
+"Wenn das GProt blockiert ist, dann wird ein Hash gespeichert, der "
+"verhindert, dass die gleiche Datei erneut hochgeladen wird."
+
 #: mafiasi/gprot/templates/gprot/_action_list.html:6
 msgid "View"
 msgstr "Anzeigen"
@@ -987,7 +999,16 @@ msgstr "Es sind nur PDF-Dateien erlaubt."
 msgid "Please select a file to upload."
 msgstr "Bitte wähle eine Datei zum Hochladen aus."
 
-#: mafiasi/gprot/views.py:285
+#: mafiasi/gprot/views.py:217
+msgid ""
+"This file was blocked because it is an original exam. Please do not try to "
+"upload it again because we will get problems with the university."
+msgstr ""
+"Der Upload wurde blockiert, weil es sich um eine Originalklausur handelt. "
+"Bitte versuche nicht, sie nochmal hochzuladen, damit wir keine Probleme mit "
+"der Universität bekommen."
+
+#: mafiasi/gprot/views.py:307
 msgid "Only PNG, JPEG and GIF files are allowed."
 msgstr "Es sind nur Bilder im PNG-, JPEG- oder GIF-Format erlaubt."
 
@@ -1408,97 +1429,6 @@ msgstr "Einladungsmails"
 msgid "Invitation mail was resent."
 msgstr "Einladungsmail wurde erneut versandt."
 
-#: mafiasi/jabber/apps.py:9 mafiasi/jabber/templates/jabber/index.html:5
-msgid "Jabber"
-msgstr "Jabber"
-
-#: mafiasi/jabber/apps.py:10
-msgid ""
-"On our Jabber server you can chat with your fellow students, which are "
-"already on your contact list."
-msgstr ""
-"Auf unserem Jabber-Server hast du deine Kommilitonen automatisch in der "
-"Kontaktliste und kannst mit ihnen chatten."
-
-#: mafiasi/jabber/templates/jabber/index.html:10
-#, python-format
-msgid ""
-"Your Jabber ID is <strong>%(username)s</strong>@%(jabber_domain)s. Note: "
-"it's different from your username."
-msgstr ""
-"Deine Jabber-ID lautet abweichend: <strong>%(username)s</"
-"strong>@%(jabber_domain)s."
-
-#: mafiasi/jabber/templates/jabber/index.html:12
-#, python-format
-msgid "Your Jabber ID is <strong>%(username)s@%(jabber_domain)s</strong>."
-msgstr ""
-"Deine Jabber-ID lautet: <strong>%(username)s@%(jabber_domain)s</strong>."
-
-#: mafiasi/jabber/templates/jabber/index.html:17
-#, python-format
-msgid ""
-"<p>If you want to change your Jabber password, just change it in your <a "
-"href=\"%(account_url)s\">account settings</a>.</p>"
-msgstr ""
-"<p>Wenn du dein Jabber-Passwort ändern möchtest, ändere einfach dein "
-"Passwort in den <a href=\"%(account_url)s\">Account-Einstellungen</a>.</p>"
-
-#: mafiasi/jabber/templates/jabber/index.html:19
-#: mafiasi/mumble/templates/mumble/index.html:23
-msgid "The fingerprint of the current SSL certificate is:"
-msgstr "Der Fingerprint des aktuellen SSL-Zertifikats lautet:"
-
-#: mafiasi/jabber/templates/jabber/index.html:22
-msgid "Configure your Jabber Client"
-msgstr "Einrichtung deines Jabber-Clients"
-
-#: mafiasi/jabber/templates/jabber/index.html:24
-msgid ""
-"\n"
-"    In order to use Jabber, you need to install a Jabber client and "
-"configure it\n"
-"    to connect to the Mafiasi server. One option is <a href=\"https://gajim."
-"org\"\n"
-"    target=\"_blank\">Gajim</a>, which is recommended by us.\n"
-"  "
-msgstr ""
-"\n"
-"Um Jabber nutzen zu können, musst du einen Jabber-Client installieren und "
-"dort deinen Mafiasi-Zugang einrichten. Die von uns empfohlene Option ist <a "
-"href=\"https://gajim.org\" target=\"_blank\">Gajim</a>."
-
-#: mafiasi/jabber/templates/jabber/index.html:32
-msgid ""
-"\n"
-"    For Android systems, we recommend using\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, which is\n"
-"    a free Jabber client. It is available for free on F-Droid or paid on "
-"the\n"
-"    Play Store.\n"
-"  "
-msgstr ""
-"\n"
-"    Für Android-Systeme empfehlen wir\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, ein\n"
-"    freier Jabber-Client, der kostenlos über F-Droid und kostenpflichtig\n"
-"    im Play Store bezogen werden kann.\n"
-"\n"
-"  "
-
-#: mafiasi/jabber/templates/jabber/index.html:41
-msgid ""
-"\n"
-"    Below you can see the required configuration for Gajim, Dino, Pidgin and "
-"Conversations.\n"
-"  "
-msgstr ""
-"\n"
-"Unten findest du die nötigen Einstellungen für Gajim, Dino, Pidgin und "
-"Conversations."
-
 #: mafiasi/kanboard/apps.py:10
 msgid "Kanboard"
 msgstr "Kanboard"
@@ -1658,14 +1588,6 @@ msgstr ""
 "Matrix ermöglicht dezentrales Chatten und VoIP mit Ende-zu-Ende-"
 "Verschlüsselung."
 
-#: mafiasi/mattermost/apps.py:10
-msgid "Chat"
-msgstr "Chat"
-
-#: mafiasi/mattermost/apps.py:11
-msgid "An online team chat service"
-msgstr "Mattermost ist ein Online-Chatservice für Teams"
-
 #: mafiasi/mumble/apps.py:9 mafiasi/mumble/templates/mumble/index.html:5
 msgid "Mumble"
 msgstr "Mumble"
@@ -2098,30 +2020,6 @@ msgstr "Neue E-Mail-Adresse"
 msgid "Change Email"
 msgstr "Mailadresse ändern"
 
-#: mafiasi/registration/templates/registration/account.html:92
-msgid ""
-"Note: You can \"change\" your password to the current password to "
-"synchronize it with other services (e.g. Jabber)"
-msgstr ""
-"Hinweis: Du kannst dein Passwört auf das aktuelle Passwort \"ändern\", um es "
-"mit anderen Diensten zu synchronisieren (z.B. Jabber)"
-
-#: mafiasi/registration/templates/registration/account.html:96
-msgid "Old password"
-msgstr "Altes Passwort"
-
-#: mafiasi/registration/templates/registration/account.html:105
-msgid "New password"
-msgstr "Neues Passwort"
-
-#: mafiasi/registration/templates/registration/account.html:114
-msgid "New password confirmation"
-msgstr "Neues Passwort bestätigen"
-
-#: mafiasi/registration/templates/registration/account.html:125
-msgid "Change password"
-msgstr "Passwort ändern"
-
 #: mafiasi/registration/templates/registration/email_error.html:5
 msgid "Email address is invalid"
 msgstr "E-Mail-Adresse ist ungültig"
@@ -3046,18 +2944,6 @@ msgstr ""
 #~ msgid "e-mails"
 #~ msgstr "E-Mails"
 
-#, fuzzy
-#~| msgid ""
-#~| "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</"
-#~| "a> to create or manage your Jabber account."
-#~ msgid ""
-#~ "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</a> "
-#~ "to see your Jabber account data."
-#~ msgstr ""
-#~ "Du musst dich <a href=\"%(login_url)s?"
-#~ "next=%(jabber_index_url)s\">einloggen</a>, um deinen Jabber-Account zu "
-#~ "erstellen oder zu verwalten."
-
 #~ msgid "Mafiasi Hub"
 #~ msgstr "Mafiasi Hub"
 
@@ -3068,21 +2954,6 @@ msgstr ""
 #~ "Muss mit einem Buchstaben beginnen und nur alphanumerische Zeichen "
 #~ "enthalten. Nur Kleinbuchstaben."
 
-#~ msgid "Create Jabber account"
-#~ msgstr "Jabber-Account erstellen"
-
-#~ msgid ""
-#~ "To create your Jabber account you have to enter your current password:"
-#~ msgstr ""
-#~ "Um deinen Jabber-Account zu erstellen, musst du dein aktuelles Passwort "
-#~ "eingeben:"
-
-#~ msgid ""
-#~ "You can now <a href=\"%(create_url)s\">create your Jabber account</a>."
-#~ msgstr ""
-#~ "Du kannst nun deinen <a href=\"%(create_url)s\">Jabber-Account erstellen</"
-#~ "a>."
-
 #~ msgid "Account was created."
 #~ msgstr "Account wurde erstellt."
 
@@ -3250,14 +3121,5 @@ msgstr ""
 #~ msgid "Confirm password:"
 #~ msgstr "Passwort bestätigen:"
 
-#~ msgid "Reset password of your Jabber account"
-#~ msgstr "Jabber-Account-Passwort zurücksetzen"
-
-#~ msgid ""
-#~ "Enter your current password to set the Jabber password to the entered one."
-#~ msgstr ""
-#~ "Gib dein aktuelles Passwort ein, um das Jabber-Passwort auf dieses "
-#~ "zurückzusetzen."
-
 #~ msgid "Reset password"
 #~ msgstr "Passwort zurücksetzen"
diff --git a/locale/en_US/LC_MESSAGES/django.po b/locale/en_US/LC_MESSAGES/django.po
index f5ea29f5..3bd0860f 100644
--- a/locale/en_US/LC_MESSAGES/django.po
+++ b/locale/en_US/LC_MESSAGES/django.po
@@ -3,14 +3,14 @@ msgstr ""
 "Project-Id-Version: Mafiasi\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2023-01-18 14:47+0100\n"
-"PO-Revision-Date: 2022-03-07 16:02+0100\n"
-"Last-Translator: Markus Neblung <9neblung@informatik.uni-hamburg.de>\n"
+"PO-Revision-Date: 2023-07-27 20:41+0200\n"
+"Last-Translator: Timon Engelke <timon.engelke@uni-hamburg.de>\n"
 "Language-Team: \n"
 "Language: en\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"X-Generator: Poedit 2.4.2\n"
+"X-Generator: Poedit 3.0.1\n"
 
 #: mafiasi/base/middleware.py:15
 msgid ""
@@ -371,6 +371,18 @@ msgstr "Upload PDF"
 msgid "Reminder: Memory minutes for \"%(coursename)s\""
 msgstr "Reminder: Memory minutes for \"%(coursename)s\""
 
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:33
+msgid "Block this Gprot"
+msgstr "Block this Gprot"
+
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:34
+msgid ""
+"When a Gprot is blocked, a hash is saved that ensures that the same file "
+"cannot be uploaded again."
+msgstr ""
+"When a Gprot is blocked, a hash is saved that ensures that the same file "
+"cannot be uploaded again."
+
 #: mafiasi/gprot/templates/gprot/_action_list.html:6
 msgid "View"
 msgstr "View"
@@ -987,7 +999,15 @@ msgstr "Only PDF files are allowed."
 msgid "Please select a file to upload."
 msgstr "Please select a file to upload."
 
-#: mafiasi/gprot/views.py:285
+#: mafiasi/gprot/views.py:217
+msgid ""
+"This file was blocked because it is an original exam. Please do not try to "
+"upload it again because we will get problems with the university."
+msgstr ""
+"This file was blocked because it is an original exam. Please do not try to "
+"upload it again because we will get problems with the university."
+
+#: mafiasi/gprot/views.py:307
 msgid "Only PNG, JPEG and GIF files are allowed."
 msgstr "Only PNG, JPEG and GIF files are allowed."
 
@@ -1411,100 +1431,6 @@ msgstr "invitation mails"
 msgid "Invitation mail was resent."
 msgstr "Invitation mail was resent."
 
-#: mafiasi/jabber/apps.py:9 mafiasi/jabber/templates/jabber/index.html:5
-msgid "Jabber"
-msgstr "Jabber"
-
-#: mafiasi/jabber/apps.py:10
-msgid ""
-"On our Jabber server you can chat with your fellow students, which are "
-"already on your contact list."
-msgstr ""
-"On our Jabber server you can chat with your fellow students, which are "
-"already on your contact list."
-
-#: mafiasi/jabber/templates/jabber/index.html:10
-#, python-format
-msgid ""
-"Your Jabber ID is <strong>%(username)s</strong>@%(jabber_domain)s. Note: "
-"it's different from your username."
-msgstr ""
-"Your Jabber ID is <strong>%(username)s</strong>@%(jabber_domain)s. Note: "
-"it's different from your username."
-
-#: mafiasi/jabber/templates/jabber/index.html:12
-#, python-format
-msgid "Your Jabber ID is <strong>%(username)s@%(jabber_domain)s</strong>."
-msgstr "Your Jabber ID is <strong>%(username)s@%(jabber_domain)s</strong>."
-
-#: mafiasi/jabber/templates/jabber/index.html:17
-#, python-format
-msgid ""
-"<p>If you want to change your Jabber password, just change it in your <a "
-"href=\"%(account_url)s\">account settings</a>.</p>"
-msgstr ""
-"<p>If you want to change your Jabber password, just change it in your <a "
-"href=\"%(account_url)s\">account settings</a>.</p>"
-
-#: mafiasi/jabber/templates/jabber/index.html:19
-#: mafiasi/mumble/templates/mumble/index.html:23
-msgid "The fingerprint of the current SSL certificate is:"
-msgstr "The fingerprint of the current SSL certificate is:"
-
-#: mafiasi/jabber/templates/jabber/index.html:22
-msgid "Configure your Jabber Client"
-msgstr "Configure your Jabber Client"
-
-#: mafiasi/jabber/templates/jabber/index.html:24
-msgid ""
-"\n"
-"    In order to use Jabber, you need to install a Jabber client and "
-"configure it\n"
-"    to connect to the Mafiasi server. One option is <a href=\"https://gajim."
-"org\"\n"
-"    target=\"_blank\">Gajim</a>, which is recommended by us.\n"
-"  "
-msgstr ""
-"\n"
-"    In order to use Jabber, you need to install a Jabber client and "
-"configure it\n"
-"    to connect to the Mafiasi server. One option is <a href=\"https://gajim."
-"org\"\n"
-"    target=\"_blank\">Gajim</a>, which is recommended by us.\n"
-"  "
-
-#: mafiasi/jabber/templates/jabber/index.html:32
-msgid ""
-"\n"
-"    For Android systems, we recommend using\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, which is\n"
-"    a free Jabber client. It is available for free on F-Droid or paid on "
-"the\n"
-"    Play Store.\n"
-"  "
-msgstr ""
-"\n"
-"    For Android systems, we recommend using\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, which is\n"
-"    a free Jabber client. It is available for free on F-Droid or paid on "
-"the\n"
-"    Play Store.\n"
-"  "
-
-#: mafiasi/jabber/templates/jabber/index.html:41
-msgid ""
-"\n"
-"    Below you can see the required configuration for Gajim, Dino, Pidgin and "
-"Conversations.\n"
-"  "
-msgstr ""
-"\n"
-"    Below you can see the required configuration for Gajim, Dino, Pidgin and "
-"Conversations.\n"
-"  "
-
 #: mafiasi/kanboard/apps.py:10
 msgid "Kanboard"
 msgstr "Kanboard"
@@ -1661,14 +1587,6 @@ msgstr "Matrix"
 msgid "Matrix provides decentralized messaging and VoIP with E2E encryption."
 msgstr "Matrix provides decentralized messaging and VoIP with E2E encryption."
 
-#: mafiasi/mattermost/apps.py:10
-msgid "Chat"
-msgstr "Chat"
-
-#: mafiasi/mattermost/apps.py:11
-msgid "An online team chat service"
-msgstr "Mattermost is an online team chat service"
-
 #: mafiasi/mumble/apps.py:9 mafiasi/mumble/templates/mumble/index.html:5
 msgid "Mumble"
 msgstr "Mumble"
@@ -2090,30 +2008,6 @@ msgstr "New Email Address"
 msgid "Change Email"
 msgstr "Change Email"
 
-#: mafiasi/registration/templates/registration/account.html:92
-msgid ""
-"Note: You can \"change\" your password to the current password to "
-"synchronize it with other services (e.g. Jabber)"
-msgstr ""
-"Note: You can \"change\" your password to the current password to "
-"synchronize it with other services (e.g. Jabber)"
-
-#: mafiasi/registration/templates/registration/account.html:96
-msgid "Old password"
-msgstr "Old password"
-
-#: mafiasi/registration/templates/registration/account.html:105
-msgid "New password"
-msgstr "New password"
-
-#: mafiasi/registration/templates/registration/account.html:114
-msgid "New password confirmation"
-msgstr "New password confirmation"
-
-#: mafiasi/registration/templates/registration/account.html:125
-msgid "Change password"
-msgstr "Change password"
-
 #: mafiasi/registration/templates/registration/email_error.html:5
 msgid "Email address is invalid"
 msgstr "Email address is invalid"
@@ -3018,17 +2912,6 @@ msgstr ""
 #~ msgid "e-mails"
 #~ msgstr "Email"
 
-#, fuzzy
-#~| msgid ""
-#~| "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</"
-#~| "a> to create or manage your Jabber account."
-#~ msgid ""
-#~ "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</a> "
-#~ "to see your Jabber account data."
-#~ msgstr ""
-#~ "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</a> "
-#~ "to create or manage your Jabber account."
-
 #~ msgid "Mafiasi Hub"
 #~ msgstr "Mafiasi Hub"
 
@@ -3039,19 +2922,6 @@ msgstr ""
 #~ "Must start with a letter and only contain alphanumeric characters. "
 #~ "Lowercase only."
 
-#~ msgid "Create Jabber account"
-#~ msgstr "Create Jabber account"
-
-#~ msgid ""
-#~ "To create your Jabber account you have to enter your current password:"
-#~ msgstr ""
-#~ "To create your Jabber account you have to enter your current password:"
-
-#~ msgid ""
-#~ "You can now <a href=\"%(create_url)s\">create your Jabber account</a>."
-#~ msgstr ""
-#~ "You can now <a href=\"%(create_url)s\">create your Jabber account</a>."
-
 #~ msgid "Account was created."
 #~ msgstr "Account was created."
 
diff --git a/locale/fr_FR/LC_MESSAGES/django.po b/locale/fr_FR/LC_MESSAGES/django.po
index c155c79b..d6d162f8 100644
--- a/locale/fr_FR/LC_MESSAGES/django.po
+++ b/locale/fr_FR/LC_MESSAGES/django.po
@@ -3,15 +3,15 @@ msgstr ""
 "Project-Id-Version: Mafiasi\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2023-01-18 14:47+0100\n"
-"PO-Revision-Date: 2022-03-07 16:02+0100\n"
-"Last-Translator: Markus Neblung <9neblung@informatik.uni-hamburg.de>\n"
+"PO-Revision-Date: 2023-07-27 20:48+0200\n"
+"Last-Translator: Timon Engelke <timon.engelke@uni-hamburg.de>\n"
 "Language-Team: \n"
 "Language: fr_FR\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"X-Generator: Poedit 2.4.2\n"
 "Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"X-Generator: Poedit 3.0.1\n"
 
 #: mafiasi/base/middleware.py:15
 msgid ""
@@ -380,6 +380,18 @@ msgstr "Télécharger le PDF"
 msgid "Reminder: Memory minutes for \"%(coursename)s\""
 msgstr "Rappel: Mémoire minutes pour \"%(coursename)s\""
 
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:33
+msgid "Block this Gprot"
+msgstr "Bloquer cette mémoire"
+
+#: mafiasi/gprot/templates/admin/gprot/gprot/change_form.html:34
+msgid ""
+"When a Gprot is blocked, a hash is saved that ensures that the same file "
+"cannot be uploaded again."
+msgstr ""
+"Quand une mémoire est bloquée, un hachage est enregistré pour assurer que le "
+"même fichier ne peut plus être téléversé."
+
 #: mafiasi/gprot/templates/gprot/_action_list.html:6
 msgid "View"
 msgstr "Vue"
@@ -1006,7 +1018,16 @@ msgstr "Seuls les fichiers PDF sont autorisés."
 msgid "Please select a file to upload."
 msgstr "S'il vous plaît sélectionner un fichier à télécharger."
 
-#: mafiasi/gprot/views.py:285
+#: mafiasi/gprot/views.py:217
+msgid ""
+"This file was blocked because it is an original exam. Please do not try to "
+"upload it again because we will get problems with the university."
+msgstr ""
+"Le fichier a été bloqué parce qu'il s'agit d'un examen original. Merce de ne "
+"pas essayer pas de le téléverser à nouveau afin d'éviter des problèmes avec "
+"l'université."
+
+#: mafiasi/gprot/views.py:307
 msgid "Only PNG, JPEG and GIF files are allowed."
 msgstr "Seuls les fichiers PNG, JPEG et GIF sont autorisés."
 
@@ -1441,102 +1462,6 @@ msgstr "mails d'invitation"
 msgid "Invitation mail was resent."
 msgstr "Invitation courrier était renvoyé."
 
-#: mafiasi/jabber/apps.py:9 mafiasi/jabber/templates/jabber/index.html:5
-msgid "Jabber"
-msgstr "Jabber"
-
-#: mafiasi/jabber/apps.py:10
-msgid ""
-"On our Jabber server you can chat with your fellow students, which are "
-"already on your contact list."
-msgstr ""
-"Sur notre serveur Jabber vous pouvez discuter avec vos collègues étudiants, "
-"qui sont déjà sur votre liste de contacts."
-
-#: mafiasi/jabber/templates/jabber/index.html:10
-#, python-format
-msgid ""
-"Your Jabber ID is <strong>%(username)s</strong>@%(jabber_domain)s. Note: "
-"it's different from your username."
-msgstr ""
-"Votre Jabber ID est <strong>%(username)s</strong>@%(jabber_domain)s. "
-"Remarque: il est différent de votre nom d'utilisateur."
-
-#: mafiasi/jabber/templates/jabber/index.html:12
-#, python-format
-msgid "Your Jabber ID is <strong>%(username)s@%(jabber_domain)s</strong>."
-msgstr ""
-"Votre identifiant Jabber est <strong>%(username)s@%(jabber_domain)s</strong>."
-
-#: mafiasi/jabber/templates/jabber/index.html:17
-#, python-format
-msgid ""
-"<p>If you want to change your Jabber password, just change it in your <a "
-"href=\"%(account_url)s\">account settings</a>.</p>"
-msgstr ""
-"<p> Si vous souhaitez modifier votre mot de passe Jabber, il suffit de "
-"changer dans votre <a href=\"%(account_url)s\"> paramètres de compte </a>. </"
-"p>"
-
-#: mafiasi/jabber/templates/jabber/index.html:19
-#: mafiasi/mumble/templates/mumble/index.html:23
-msgid "The fingerprint of the current SSL certificate is:"
-msgstr "L'empreinte du certificat SSL actuel est:"
-
-#: mafiasi/jabber/templates/jabber/index.html:22
-msgid "Configure your Jabber Client"
-msgstr "Configurez votre client Jabber"
-
-#: mafiasi/jabber/templates/jabber/index.html:24
-msgid ""
-"\n"
-"    In order to use Jabber, you need to install a Jabber client and "
-"configure it\n"
-"    to connect to the Mafiasi server. One option is <a href=\"https://gajim."
-"org\"\n"
-"    target=\"_blank\">Gajim</a>, which is recommended by us.\n"
-"  "
-msgstr ""
-"\n"
-"En afin d'utiliser Jabber, vous devez installer un client jabber et le "
-"configurer \n"
-"pour se connecter au serveur Mafiasi. Une option est <a href=\"https://gajim."
-"org\"\n"
-"target=\"_blank\">Gajim</a>, qui est recommendé par nous.\n"
-"  "
-
-#: mafiasi/jabber/templates/jabber/index.html:32
-msgid ""
-"\n"
-"    For Android systems, we recommend using\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, which is\n"
-"    a free Jabber client. It is available for free on F-Droid or paid on "
-"the\n"
-"    Play Store.\n"
-"  "
-msgstr ""
-"\n"
-"    Pour les systèmes Android, nous recommandons d'utiliser\n"
-"    <a href=\"https://conversations.im\" target=\"_blank\">Conversations</"
-"a>, c'est\n"
-"    un client Jabber libre. Il est disponible gratuitement sur F-Droid ou "
-"payé sur le\n"
-"    Play Store.\n"
-"  "
-
-#: mafiasi/jabber/templates/jabber/index.html:41
-msgid ""
-"\n"
-"    Below you can see the required configuration for Gajim, Dino, Pidgin and "
-"Conversations.\n"
-"  "
-msgstr ""
-"\n"
-"    Vous trouverez ci-dessous la configuration requise pour Gajim, Dino, "
-"Pidgin et Conversations.\n"
-"  "
-
 #: mafiasi/kanboard/apps.py:10
 msgid "Kanboard"
 msgstr "Kanboard"
@@ -1697,14 +1622,6 @@ msgstr ""
 "Matrix fournit messagerie décentralisée et VoIP avec chiffrement de bout en "
 "bout."
 
-#: mafiasi/mattermost/apps.py:10
-msgid "Chat"
-msgstr "Chat"
-
-#: mafiasi/mattermost/apps.py:11
-msgid "An online team chat service"
-msgstr "Mattermost est un service de chat de groupe en ligne"
-
 #: mafiasi/mumble/apps.py:9 mafiasi/mumble/templates/mumble/index.html:5
 msgid "Mumble"
 msgstr "Marmonner"
@@ -2134,30 +2051,6 @@ msgstr "Nouvel adresse é-mail"
 msgid "Change Email"
 msgstr "Modifier adresse é-mail"
 
-#: mafiasi/registration/templates/registration/account.html:92
-msgid ""
-"Note: You can \"change\" your password to the current password to "
-"synchronize it with other services (e.g. Jabber)"
-msgstr ""
-"Remarque: Vous pouvez \"changement\" votre mot de passe le mot de passe en "
-"cours pour le synchroniser avec d'autres services (par exemple, Jabber)"
-
-#: mafiasi/registration/templates/registration/account.html:96
-msgid "Old password"
-msgstr "Ancien mot de passe"
-
-#: mafiasi/registration/templates/registration/account.html:105
-msgid "New password"
-msgstr "Nouveau mot de passe"
-
-#: mafiasi/registration/templates/registration/account.html:114
-msgid "New password confirmation"
-msgstr "Nouvelle confirmation de mot de passe"
-
-#: mafiasi/registration/templates/registration/account.html:125
-msgid "Change password"
-msgstr "Changer le mot de passe"
-
 #: mafiasi/registration/templates/registration/email_error.html:5
 msgid "Email address is invalid"
 msgstr "Adresse é-mail ne est pas valide"
@@ -3065,17 +2958,6 @@ msgstr ""
 #~ msgid "e-mails"
 #~ msgstr "Èmail"
 
-#, fuzzy
-#~| msgid ""
-#~| "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</"
-#~| "a> to create or manage your Jabber account."
-#~ msgid ""
-#~ "You have to <a href=\"%(login_url)s?next=%(jabber_index_url)s\">login</a> "
-#~ "to see your Jabber account data."
-#~ msgstr ""
-#~ "Vous devez vous identifier <a href=\"%(login_url)s?"
-#~ "next=%(jabber_index_url)s\"> </a> pour créer ou gérer votre compte Jabber."
-
 #~ msgid "Mafiasi Hub"
 #~ msgstr "Mafiasi Hub"
 
@@ -3086,21 +2968,6 @@ msgstr ""
 #~ "Doit commencer par une lettre et ne contenir que des caractères "
 #~ "alphanumériques. Minuscules seulement."
 
-#~ msgid "Create Jabber account"
-#~ msgstr "Créez un compte Jabber"
-
-#~ msgid ""
-#~ "To create your Jabber account you have to enter your current password:"
-#~ msgstr ""
-#~ "Pour créer votre compte Jabber, vous devez entrer votre mot de passe "
-#~ "actuel:"
-
-#~ msgid ""
-#~ "You can now <a href=\"%(create_url)s\">create your Jabber account</a>."
-#~ msgstr ""
-#~ "Vous pouvez maintenant <a href=\"%(create_url)s\"> créer votre compte </"
-#~ "a> Jabber."
-
 #~ msgid "Account was created."
 #~ msgstr "Compte a été créé."
 
diff --git a/mafiasi/base/templates/base/licenses.html b/mafiasi/base/templates/base/licenses.html
index f5148a76..45a8a11f 100644
--- a/mafiasi/base/templates/base/licenses.html
+++ b/mafiasi/base/templates/base/licenses.html
@@ -154,7 +154,7 @@ <h3>Third-party assets</h3>
 			<td><a href="http://glyphicons.com/">Glyphicons Halflings</a> (as part of Bootstrap)</td>
 			<td>Jan Kovařík</td>
 			<td>See bootstrap license</td>
-			<td>Dashboard icons for "Dudel", "Jabber"; some icons in buttons</td>
+			<td>Dashboard icons for "Bitpoll"; some icons in buttons</td>
 		</tr>
 		<tr>
 			<td><a href="http://www.redmine.org/projects/redmine/wiki/Logo">Redmine logo</a></td>
diff --git a/mafiasi/base/templates/base/technical_info.html b/mafiasi/base/templates/base/technical_info.html
index 107cb2bf..b36763a8 100644
--- a/mafiasi/base/templates/base/technical_info.html
+++ b/mafiasi/base/templates/base/technical_info.html
@@ -63,7 +63,6 @@
         <li><a href="https://www.npmjs.com/package/ep_subscript_and_superscript">subscript_and_superscript</a></li>
     </ul>
     <li><a href="http://www.sogo.nu/">SOGo</a></li>
-    <li><a href="https://www.ejabberd.im/">Ejabberd</a></li>
     <li><a href="http://www.postfix.org/">Postfix</a></li>
     <li><a href="https://getsentry.com/welcome/">Sentry</a></li>
 </ul>
diff --git a/mafiasi/gprot/admin.py b/mafiasi/gprot/admin.py
index 803ec89b..7aabe1dd 100644
--- a/mafiasi/gprot/admin.py
+++ b/mafiasi/gprot/admin.py
@@ -1,7 +1,12 @@
-from django.contrib import admin
+import hashlib
+
+from django.contrib import admin, messages
+from django.shortcuts import get_object_or_404, redirect
+from django.urls import path, reverse
 
 from mafiasi.gprot.models import (
     Attachment,
+    BlockedGprots,
     Favorite,
     GProt,
     Label,
@@ -18,6 +23,35 @@ class GProtAdmin(admin.ModelAdmin):
     list_filter = ("published", "is_pdf")
     search_fields = ("course__name",)
 
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path("<path:object_id>/block/", self.admin_site.admin_view(self.block_view), name="gprot_block"),
+        ]
+
+        return custom_urls + urls
+
+    def block_view(self, request, object_id):
+        to_block = get_object_or_404(GProt, pk=object_id)
+        if not to_block.is_pdf:
+            messages.error(request, "Cannot block, not a PDF")
+        else:
+            to_block.published = False
+            to_block.save()
+            pdf_filefield = to_block.content_pdf
+            if not pdf_filefield:
+                messages.error(request, "Cannot block, no file")
+            else:
+                pdf_filefield.file.open()
+                contents = pdf_filefield.file.read()
+                pdf_filefield.file.close()
+                pdf_filefield.delete()
+                hash = hashlib.sha256(contents).hexdigest()
+                BlockedGprots.objects.create(pdf_hash=hash, gprot_title=str(to_block), blocked_by=request.user)
+                messages.success(request, "Successfully blocked")
+
+        return redirect(reverse("admin:gprot_gprot_change", args=(object_id,)))
+
 
 admin.site.register(GProt, GProtAdmin)
 
@@ -25,3 +59,4 @@ class GProtAdmin(admin.ModelAdmin):
 admin.site.register(Reminder)
 admin.site.register(Label)
 admin.site.register(Favorite)
+admin.site.register(BlockedGprots)
diff --git a/mafiasi/gprot/migrations/0006_blockedgprots.py b/mafiasi/gprot/migrations/0006_blockedgprots.py
new file mode 100644
index 00000000..532d2a74
--- /dev/null
+++ b/mafiasi/gprot/migrations/0006_blockedgprots.py
@@ -0,0 +1,27 @@
+# Generated by Django 4.1 on 2023-07-27 17:43
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("gprot", "0005_alter_favorite_url"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="BlockedGprots",
+            fields=[
+                ("id", models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("pdf_hash", models.CharField(max_length=64)),
+                ("gprot_title", models.CharField(max_length=100)),
+                (
+                    "blocked_by",
+                    models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+                ),
+            ],
+        ),
+    ]
diff --git a/mafiasi/gprot/models.py b/mafiasi/gprot/models.py
index dcff4eb7..2e4a0b4e 100644
--- a/mafiasi/gprot/models.py
+++ b/mafiasi/gprot/models.py
@@ -60,6 +60,15 @@ def __str__(self):
         return "[{0}] {1}: {2}{3}".format(self.pk, self.exam_date, self.course, append)
 
 
+class BlockedGprots(models.Model):
+    pdf_hash = models.CharField(max_length=64)
+    gprot_title = models.CharField(max_length=100)
+    blocked_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
+
+    def __str__(self):
+        return "BlockedGprot: {0}".format(self.gprot_title)
+
+
 class Attachment(models.Model):
     gprot = models.ForeignKey(GProt, on_delete=models.CASCADE)
     file = models.FileField(upload_to=make_attachment_filename)
diff --git a/mafiasi/gprot/templates/admin/gprot/gprot/change_form.html b/mafiasi/gprot/templates/admin/gprot/gprot/change_form.html
new file mode 100644
index 00000000..60fb762a
--- /dev/null
+++ b/mafiasi/gprot/templates/admin/gprot/gprot/change_form.html
@@ -0,0 +1,37 @@
+{% extends "admin/change_form.html" %}
+{% load i18n %}
+{% block extrastyle %}{{ block.super }}
+<style>
+.block {
+    padding: 12px 14px 7px;
+    margin: 0 0 20px;
+    background: var(--darkened-bg);
+    border: 1px solid var(--hairline-color);
+    border-radius: 4px;
+    text-align: right;
+    overflow: hidden;
+}
+
+.block > p {
+    margin: 10px 7px;
+}
+.block > a {
+    float: left;
+    background: var(--delete-button-bg);
+    border-radius: 4px;
+    height: 15px;
+    line-height: 15px;
+    margin-bottom: 5px;
+    color: var(--button-fg);
+    padding: 10px 7px;
+    display: block;
+}
+</style>
+{% endblock %}
+{% block after_related_objects %}
+<div class="block">
+<a href="{% url 'admin:gprot_block' object_id %}">{% translate 'Block this Gprot' %}</a>
+    <p>{% blocktranslate %}When a Gprot is blocked, a hash is saved that ensures that the same file cannot be uploaded again.{% endblocktranslate %}</p>
+</div>
+    <div style="clear: left;"></div>
+{% endblock %}
diff --git a/mafiasi/gprot/views.py b/mafiasi/gprot/views.py
index 7ca9e705..be6217fe 100644
--- a/mafiasi/gprot/views.py
+++ b/mafiasi/gprot/views.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import hashlib
 import json
 import time
 from datetime import date
@@ -24,7 +25,14 @@
 from raven.contrib.django.raven_compat.models import client
 
 from mafiasi.gprot.forms import GProtBasicForm, GProtCreateForm, GProtSearchForm
-from mafiasi.gprot.models import Attachment, Favorite, GProt, Notification, Reminder
+from mafiasi.gprot.models import (
+    Attachment,
+    BlockedGprots,
+    Favorite,
+    GProt,
+    Notification,
+    Reminder,
+)
 from mafiasi.gprot.sanitize import clean_html
 from mafiasi.teaching.forms import CourseForm, TeacherForm
 from mafiasi.teaching.models import Course, Teacher, insert_autocomplete_courses
@@ -195,6 +203,7 @@ def edit_gprot(request, gprot_pk):
                     error = _("Only files up to {0} MB are allowed.").format(settings.GPROT_PDF_MAX_SIZE)
                 if magic.from_buffer(upload.read(1024), mime=True) != "application/pdf":
                     error = _("Only PDF files are allowed.")
+
             else:
                 error = _("Please select a file to upload.")
 
@@ -204,6 +213,16 @@ def edit_gprot(request, gprot_pk):
                 gprot.content_pdf = upload
                 gprot.save()
                 _clean_pdf_metadata(gprot)
+                # we have to calculate the hash after cleaning the file
+                gprot.content_pdf.file.open()
+                pdf_content = gprot.content_pdf.file.read()
+                gprot.content_pdf.file.close()
+                hash = hashlib.sha256(pdf_content).hexdigest()
+                if BlockedGprots.objects.filter(pdf_hash=hash).exists():
+                    error = _(
+                        "This file was blocked because it is an original exam. Please do not try to upload it again because we will get problems with the university."
+                    )
+                    gprot.content_pdf.delete()
 
         else:
             content = request.POST.get("content", "")
diff --git a/mafiasi/jabber/__init__.py b/mafiasi/jabber/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/mafiasi/jabber/admin.py b/mafiasi/jabber/admin.py
deleted file mode 100644
index 849332f0..00000000
--- a/mafiasi/jabber/admin.py
+++ /dev/null
@@ -1,25 +0,0 @@
-from django import forms
-from django.contrib import admin
-
-from mafiasi.base.models import Yeargroup
-from mafiasi.jabber.models import (
-    DefaultGroup,
-    JabberUserMapping,
-    YeargroupSrGroupMapping,
-)
-
-
-class YeargroupSrGroupMappingForm(forms.ModelForm):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        yeargroups = Yeargroup.objects.values_list("id", "name")
-        self.fields["yeargroup_id"] = forms.ChoiceField(choices=yeargroups)
-
-
-class YeargroupSrGroupMappingAdmin(admin.ModelAdmin):
-    form = YeargroupSrGroupMappingForm
-
-
-admin.site.register(DefaultGroup)
-admin.site.register(JabberUserMapping)
-admin.site.register(YeargroupSrGroupMapping, YeargroupSrGroupMappingAdmin)
diff --git a/mafiasi/jabber/apps.py b/mafiasi/jabber/apps.py
deleted file mode 100644
index 6ba45408..00000000
--- a/mafiasi/jabber/apps.py
+++ /dev/null
@@ -1,15 +0,0 @@
-from django.utils.translation import gettext_lazy as _
-
-from mafiasi.base.base_apps import BaseService
-
-
-class JabberConfig(BaseService):
-    default = True
-    name = "mafiasi.jabber"
-    verbose_name = "Jabber"
-    title = _("Jabber")
-    description = _(
-        "On our Jabber server you can chat with your fellow students, which are already on your contact list."
-    )
-    link = "/jabber/"
-    image = "img/services/jabber.svg"
diff --git a/mafiasi/jabber/dbrouter.py b/mafiasi/jabber/dbrouter.py
deleted file mode 100644
index 6c9898b1..00000000
--- a/mafiasi/jabber/dbrouter.py
+++ /dev/null
@@ -1,23 +0,0 @@
-class JabberRouter(object):
-    def db_for_read(self, model, **hints):
-        if model._meta.app_label == "jabber":
-            return "jabber"
-        return None
-
-    def db_for_write(self, model, **hints):
-        if model._meta.app_label == "jabber":
-            return "jabber"
-        return None
-
-    def allow_relation(self, obj1, obj2, **hints):
-        if obj1._meta.app_label == "jabber" or obj2._meta.app_label == "jabber":
-            return obj1._meta.app_label == obj2._meta.app_label
-        return None
-
-    def allow_migrate(self, db, app_label, model_name=None, **hints):
-        if db == "jabber":
-            return app_label == "jabber"
-        else:
-            if app_label == "jabber":
-                return False
-        return None
diff --git a/mafiasi/jabber/erlangparser.py b/mafiasi/jabber/erlangparser.py
deleted file mode 100644
index bb40a2fd..00000000
--- a/mafiasi/jabber/erlangparser.py
+++ /dev/null
@@ -1,34 +0,0 @@
-import json
-import re
-from typing import Union
-
-
-def parse(string: str) -> dict:
-    # To make the data json, the headers have to be quoted and the angle brackets have to be removed
-    # i.e. {key, <<"value">>} to {"key": "value"}
-    quoted_headers = re.sub(r"\{(\w+),", r'{"\1":', string)
-    no_angle_brackets = re.sub(r'<<("[^"]+")>>', r"\1", quoted_headers)
-    data = json.loads(no_angle_brackets)
-    # Now, the data is available in Python, but it is a list of one-element dictionaries
-    # These dictionaries are merged here.
-    result = dict()
-    for item in data:
-        result.update(item)
-    return result
-
-
-def _sanitize(object_to_sanitize: Union[list, str]) -> Union[list, str]:
-    # To avoid possible code injections, keep only letters, digits, and whitespace
-    if isinstance(object_to_sanitize, list):
-        return [_sanitize(x) for x in object_to_sanitize]
-    return re.sub(r"[^\w\s]", "", object_to_sanitize)
-
-
-def dump(object: dict) -> str:
-    # First, the merged dictionary has to be split in a list of one-element dictionaries
-    data = [{_sanitize(k): _sanitize(v)} for k, v in object.items()]
-    # Then, the data is stringified and the transformations from before (header quotes, angle brackets) are reverted
-    string = json.dumps(data)
-    no_quoted_headers = re.sub(r'\{"(\w+)":', r"{\1,", string)
-    angle_brackets = re.sub(r'("[^"]+")', r"<<\1>>", no_quoted_headers)
-    return angle_brackets
diff --git a/mafiasi/jabber/migrations/0001_initial.py b/mafiasi/jabber/migrations/0001_initial.py
deleted file mode 100644
index f171df0a..00000000
--- a/mafiasi/jabber/migrations/0001_initial.py
+++ /dev/null
@@ -1,203 +0,0 @@
-# -*- coding: utf-8 -*-
-
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-    dependencies = []
-
-    operations = [
-        migrations.CreateModel(
-            name="DefaultGroup",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("group_type", models.CharField(max_length=16, choices=[("student", "Student"), ("other", "Other")])),
-            ],
-            options={},
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="JabberUser",
-            fields=[
-                ("username", models.TextField(serialize=False, primary_key=True)),
-                ("password", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "users",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="JabberUserMapping",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("mafiasi_user_id", models.IntegerField(unique=True)),
-                ("jabber_user", models.OneToOneField(to="jabber.JabberUser", on_delete=models.CASCADE)),
-            ],
-            options={},
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="PrivacyDefaultList",
-            fields=[
-                ("username", models.TextField(serialize=False, primary_key=True)),
-                ("name", models.TextField()),
-            ],
-            options={
-                "db_table": "privacy_default_list",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="PrivacyList",
-            fields=[
-                ("id", models.IntegerField(serialize=False, primary_key=True)),
-                ("username", models.TextField()),
-                ("name", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "privacy_list",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="PrivacyListData",
-            fields=[
-                (
-                    "privacy_list",
-                    models.ForeignKey(
-                        related_name="data",
-                        primary_key=True,
-                        db_column="id",
-                        serialize=False,
-                        to="jabber.PrivacyList",
-                        on_delete=models.CASCADE,
-                    ),
-                ),
-                ("t", models.CharField(max_length=1)),
-                ("value", models.TextField()),
-                ("action", models.CharField(max_length=1)),
-                ("ord", models.IntegerField()),
-                ("match_all", models.BooleanField(default=False)),
-                ("match_iq", models.BooleanField(default=False)),
-                ("match_message", models.BooleanField(default=False)),
-                ("match_presence_in", models.BooleanField(default=False)),
-                ("match_presence_out", models.BooleanField(default=False)),
-            ],
-            options={
-                "db_table": "privacy_list_data",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="PrivateStorage",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("username", models.TextField()),
-                ("namespace", models.TextField()),
-                ("data", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "private_storage",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="Rostergroups",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("username", models.TextField()),
-                ("jid", models.TextField()),
-                ("grp", models.TextField()),
-            ],
-            options={
-                "db_table": "rostergroups",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="Rosteruser",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("username", models.TextField()),
-                ("jid", models.TextField()),
-                ("nick", models.TextField()),
-                ("subscription", models.CharField(max_length=1)),
-                ("ask", models.CharField(max_length=1)),
-                ("askmessage", models.TextField()),
-                ("server", models.CharField(max_length=1)),
-                ("subscribe", models.TextField(blank=True)),
-                ("type", models.TextField(blank=True)),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "rosterusers",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="SrGroup",
-            fields=[
-                ("name", models.TextField(serialize=False, primary_key=True)),
-                ("opts", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "sr_group",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="SrUser",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("jid", models.TextField()),
-                ("grp", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "sr_user",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="Vcard",
-            fields=[
-                ("username", models.TextField(serialize=False, primary_key=True)),
-                ("vcard", models.TextField()),
-                ("created_at", models.DateTimeField()),
-            ],
-            options={
-                "db_table": "vcard",
-            },
-            bases=(models.Model,),
-        ),
-        migrations.CreateModel(
-            name="YeargroupSrGroupMapping",
-            fields=[
-                ("id", models.AutoField(verbose_name="ID", serialize=False, auto_created=True, primary_key=True)),
-                ("yeargroup_id", models.IntegerField(unique=True)),
-                ("sr_group", models.ForeignKey(to="jabber.SrGroup", on_delete=models.CASCADE)),
-            ],
-            options={},
-            bases=(models.Model,),
-        ),
-        migrations.AlterUniqueTogether(
-            name="sruser",
-            unique_together=set([("jid", "grp")]),
-        ),
-        migrations.AlterUniqueTogether(
-            name="jabberusermapping",
-            unique_together=set([("jabber_user", "mafiasi_user_id")]),
-        ),
-        migrations.AddField(
-            model_name="defaultgroup",
-            name="sr_group",
-            field=models.ForeignKey(to="jabber.SrGroup", on_delete=models.CASCADE),
-            preserve_default=True,
-        ),
-    ]
diff --git a/mafiasi/jabber/migrations/0002_auto_20150515_0237.py b/mafiasi/jabber/migrations/0002_auto_20150515_0237.py
deleted file mode 100644
index 2fa74888..00000000
--- a/mafiasi/jabber/migrations/0002_auto_20150515_0237.py
+++ /dev/null
@@ -1,25 +0,0 @@
-# -*- coding: utf-8 -*-
-
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-    dependencies = [
-        ("jabber", "0001_initial"),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name="privacylistdata",
-            name="privacy_list",
-            field=models.OneToOneField(
-                related_name="data",
-                primary_key=True,
-                db_column="id",
-                serialize=False,
-                to="jabber.PrivacyList",
-                on_delete=models.CASCADE,
-            ),
-        ),
-    ]
diff --git a/mafiasi/jabber/migrations/0003_auto_20161011_2104.py b/mafiasi/jabber/migrations/0003_auto_20161011_2104.py
deleted file mode 100644
index d8c7d58c..00000000
--- a/mafiasi/jabber/migrations/0003_auto_20161011_2104.py
+++ /dev/null
@@ -1,19 +0,0 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.10.2 on 2016-10-11 19:04
-
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-    dependencies = [
-        ("jabber", "0002_auto_20150515_0237"),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name="jabberuser",
-            name="password",
-            field=models.TextField(default="NO_PASSWORDS_IN_DB_ZYYJN53N3M5QMHNQKLOAQD7E"),
-        ),
-    ]
diff --git a/mafiasi/jabber/migrations/0004_alter_created_at.py b/mafiasi/jabber/migrations/0004_alter_created_at.py
deleted file mode 100644
index 0b1f906e..00000000
--- a/mafiasi/jabber/migrations/0004_alter_created_at.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# Generated by Django 3.2 on 2021-09-03 12:41
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-    dependencies = [
-        ("jabber", "0003_auto_20161011_2104"),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name="sruser",
-            name="created_at",
-            field=models.DateTimeField(auto_now_add=True),
-        ),
-        migrations.AlterField(
-            model_name="srgroup",
-            name="created_at",
-            field=models.DateTimeField(auto_now_add=True),
-        ),
-    ]
diff --git a/mafiasi/jabber/migrations/__init__.py b/mafiasi/jabber/migrations/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/mafiasi/jabber/models.py b/mafiasi/jabber/models.py
deleted file mode 100644
index fe871ee3..00000000
--- a/mafiasi/jabber/models.py
+++ /dev/null
@@ -1,310 +0,0 @@
-import logging
-from html import escape
-
-from django.conf import settings
-from django.contrib.auth import get_user_model
-from django.db import models, transaction
-from django.db.models.signals import post_save
-from django.dispatch import receiver
-from django.utils.timezone import now
-
-from mafiasi.base.models import Mafiasi, Yeargroup
-from mafiasi.jabber import erlangparser
-
-
-class PrivacyDefaultList(models.Model):
-    username = models.TextField(primary_key=True)
-    name = models.TextField()
-
-    class Meta:
-        db_table = "privacy_default_list"
-
-    def __str__(self):
-        return "{0}: {1}".format(self.username, self.name)
-
-
-class PrivacyList(models.Model):
-    id = models.IntegerField(primary_key=True)
-    username = models.TextField()
-    name = models.TextField()
-    created_at = models.DateTimeField()
-
-    class Meta:
-        db_table = "privacy_list"
-
-    def __str__(self):
-        return "{0}: {1}".format(self.username, self.name)
-
-
-class PrivacyListData(models.Model):
-    privacy_list = models.OneToOneField(
-        PrivacyList, on_delete=models.CASCADE, db_column="id", related_name="data", primary_key=True
-    )
-    t = models.CharField(max_length=1)
-    value = models.TextField()
-    action = models.CharField(max_length=1)
-    ord = models.IntegerField()
-    match_all = models.BooleanField(default=False)
-    match_iq = models.BooleanField(default=False)
-    match_message = models.BooleanField(default=False)
-    match_presence_in = models.BooleanField(default=False)
-    match_presence_out = models.BooleanField(default=False)
-
-    class Meta:
-        db_table = "privacy_list_data"
-
-    def __str__(self):
-        return str(self.privacy_list)
-
-
-class PrivateStorage(models.Model):
-    username = models.TextField()
-    namespace = models.TextField()
-    data = models.TextField()
-    created_at = models.DateTimeField()
-
-    class Meta:
-        db_table = "private_storage"
-
-    def __str__(self):
-        return self.username
-
-
-class Rostergroups(models.Model):
-    username = models.TextField()
-    jid = models.TextField()
-    grp = models.TextField()
-
-    class Meta:
-        db_table = "rostergroups"
-
-    def __str__(self):
-        return "{0} {1}/{2}".format(self.username, self.grp, self.jid)
-
-
-class Rosteruser(models.Model):
-    username = models.TextField()
-    jid = models.TextField()
-    nick = models.TextField()
-    subscription = models.CharField(max_length=1)
-    ask = models.CharField(max_length=1)
-    askmessage = models.TextField()
-    server = models.CharField(max_length=1)
-    subscribe = models.TextField(blank=True)
-    type = models.TextField(blank=True)
-    created_at = models.DateTimeField()
-
-    class Meta:
-        db_table = "rosterusers"
-
-    def __str__(self):
-        return "{0}: {1} ({2})".format(self.username, self.nick, self.jid)
-
-
-class SrGroup(models.Model):
-    name = models.TextField(primary_key=True)
-    opts = models.TextField()
-    created_at = models.DateTimeField(auto_now_add=True)
-
-    class Meta:
-        db_table = "sr_group"
-
-    def __str__(self):
-        return self.name
-
-
-class SrUser(models.Model):
-    jid = models.TextField()
-    grp = models.TextField()
-    created_at = models.DateTimeField(auto_now_add=True)
-
-    class Meta:
-        db_table = "sr_user"
-        unique_together = ("jid", "grp")
-
-    def __str__(self):
-        return "{0} in {1}".format(self.jid, self.grp)
-
-
-class JabberUser(models.Model):
-    username = models.TextField(primary_key=True)
-    password = models.TextField(default="NO_PASSWORDS_IN_DB_ZYYJN53N3M5QMHNQKLOAQD7E")
-    created_at = models.DateTimeField()
-
-    class Meta:
-        db_table = "users"
-
-    def __str__(self):
-        return self.username
-
-    def get_jid(self):
-        return "{0}@{1}".format(self.username, settings.JABBER_DOMAIN)
-
-    def set_nickname(self, nickname):
-        Vcard.objects.filter(username=self.username).delete()
-        vcard_tpl = "<vCard xmlns='vcard-temp'><NICKNAME>{nick}</NICKNAME></vCard>"
-        vcard_xml = vcard_tpl.format(nick=escape(nickname, quote=True))
-        try:
-            vcard = Vcard.objects.get(username=self.username)
-            vcard.vcard = vcard_xml
-        except Vcard.DoesNotExist:
-            vcard = Vcard(username=self.username, vcard=vcard_xml, created_at=now())
-        vcard.save()
-
-
-class Vcard(models.Model):
-    username = models.TextField(primary_key=True)
-    vcard = models.TextField()
-    created_at = models.DateTimeField()
-
-    class Meta:
-        db_table = "vcard"
-
-    def __str__(self):
-        return self.username
-
-
-class JabberUserMapping(models.Model):
-    jabber_user = models.OneToOneField(JabberUser, on_delete=models.CASCADE)
-    mafiasi_user_id = models.IntegerField(unique=True)
-
-    class Meta:
-        unique_together = ("jabber_user", "mafiasi_user_id")
-
-    def __str__(self):
-        return "{0} owns {1}@{2}".format(self.mafiasi_user, self.jabber_user, settings.JABBER_DOMAIN)
-
-    def _set_mafiasi_user(self, user):
-        self.mafiasi_user_id = user.pk
-
-    def _get_mafiasi_user(self):
-        if not hasattr(self, "_mafiasi_user"):
-            User = get_user_model()
-            try:
-                self._mafiasi_user = User.objects.get(pk=self.mafiasi_user_id)
-            except User.DoesNotExist:
-                self._mafiasi_user = None
-        return self._mafiasi_user
-
-    mafiasi_user = property(_get_mafiasi_user, _set_mafiasi_user)
-
-
-class YeargroupSrGroupMapping(models.Model):
-    yeargroup_id = models.IntegerField(unique=True)
-    sr_group = models.ForeignKey(SrGroup, on_delete=models.CASCADE)
-
-    def __str__(self):
-        return "{0} -> {1}".format(self.yeargroup, self.sr_group)
-
-    def _get_yeargroup(self):
-        if not hasattr(self, "_yeargroup"):
-            self._yeargroup = Yeargroup.objects.get(pk=self.yeargroup_id)
-        return self._yeargroup
-
-    def _set_yeargroup(self, yeargroup):
-        self.yeargroup_id = yeargroup.pk
-
-    yeargroup = property(_get_yeargroup, _set_yeargroup)
-
-
-GROUP_TYPE_CHOICES = (
-    ("student", "Student"),
-    ("other", "Other"),
-)
-
-
-class DefaultGroup(models.Model):
-    group_type = models.CharField(max_length=16, choices=GROUP_TYPE_CHOICES)
-    sr_group = models.ForeignKey(SrGroup, on_delete=models.CASCADE)
-
-    def __str__(self):
-        return "{0}: {1}".format(self.get_group_type_display(), self.sr_group)
-
-
-def get_or_create_account(user):
-    try:
-        mapping = JabberUserMapping.objects.get(mafiasi_user_id=user.pk)
-        return mapping.jabber_user
-    except JabberUserMapping.DoesNotExist:
-        return create_jabber_account(user)
-
-
-@receiver(post_save, sender=Mafiasi)
-def _account_creation_cb(instance, created, **kwargs):
-    if created:
-        create_jabber_account(instance)
-
-
-def create_jabber_account(mafiasi):
-    if mafiasi.is_student:
-        group_type = "student"
-    else:
-        group_type = "other"
-
-    default_groups = DefaultGroup.objects.filter(group_type=group_type)
-    sr_groups = [dg.sr_group for dg in default_groups]
-
-    if mafiasi.yeargroup:
-        try:
-            m = YeargroupSrGroupMapping.objects.get(yeargroup_id=mafiasi.yeargroup.pk)
-            sr_groups.append(m.sr_group)
-        except YeargroupSrGroupMapping.DoesNotExist:
-            logging.exception("Jabber yeargroup missing for user %s", mafiasi)
-
-    user = JabberUser.objects.create(username=mafiasi.username, created_at=now())
-
-    if mafiasi.first_name:
-        nickname = "{0} ({1})".format(mafiasi.first_name, mafiasi.username)
-    else:
-        nickname = mafiasi.username
-    user.set_nickname(nickname)
-
-    JabberUserMapping.objects.create(mafiasi_user_id=mafiasi.pk, jabber_user=user)
-
-    jid = user.get_jid()
-    for sr_group in sr_groups:
-        SrUser.objects.create(jid=jid, grp=sr_group.name, created_at=now())
-
-    return user
-
-
-@receiver(post_save, sender=Yeargroup)
-def create_yeargroup(instance: Yeargroup, created, **kwargs):
-    if not created:
-        # No changes necessary
-        return
-
-    jabber_group_name = instance.slug
-    # The sr_group table is the table containing the groups for the shared roster (sr).
-    # For each yeargroup, all students of the yeargroup are added to the corresponding
-    # sr_group automatically, via the create_jabber_account hook above.
-    sr_group = SrGroup.objects.create(name=jabber_group_name, opts=erlangparser.dump({"name": instance.name}))
-    # Then, the sr group is mapped to the correct yeargroup in mafiasi.
-    YeargroupSrGroupMapping.objects.create(yeargroup_id=instance.id, sr_group=sr_group)
-
-    if instance.is_student_group:
-        # To make the new group visible to all other users, it is added to 'jxxxx_seher'. This
-        # is a group containing all users that should see the other users and the default group
-        # for new student users. Therefore, only student yeargroups should be added to the groups
-        # seen by jxxxx_seher, other groups should only see themselves.
-        # This code is in an atomic transaction to avoid other changes to the options string during
-        # the operation. Unfortunately, these options are stored as an Erlang string which has to be
-        # parsed manually.
-        with transaction.atomic(using=SrGroup.objects.db):
-            seher_group, _created = SrGroup.objects.get_or_create(name="jxxxx_seher", defaults={"opts": "[]"})
-            current_group_options = seher_group.opts
-            # These options are in the erlang string format
-            options = erlangparser.parse(current_group_options)
-            displayed_groups = options.get("displayed_groups", [])
-            displayed_groups.append(jabber_group_name)
-            displayed_groups.sort()
-            options["displayed_groups"] = displayed_groups
-            seher_group.opts = erlangparser.dump(options)
-            seher_group.save()
-    else:
-        # For non-student groups, make the group view itself.
-        options = sr_group.opts
-        data = erlangparser.parse(options)
-        data["displayed_groups"] = [jabber_group_name]
-        sr_group.opts = erlangparser.dump(data)
-        sr_group.save()
diff --git a/mafiasi/jabber/sql/srgroup.sql b/mafiasi/jabber/sql/srgroup.sql
deleted file mode 100644
index d62d304e..00000000
--- a/mafiasi/jabber/sql/srgroup.sql
+++ /dev/null
@@ -1 +0,0 @@
-ALTER TABLE sr_group ADD PRIMARY KEY(name);
diff --git a/mafiasi/jabber/sql/sruser.sql b/mafiasi/jabber/sql/sruser.sql
deleted file mode 100644
index 9ea7777a..00000000
--- a/mafiasi/jabber/sql/sruser.sql
+++ /dev/null
@@ -1 +0,0 @@
-ALTER TABLE sr_user ADD COLUMN id SERIAL PRIMARY KEY;
diff --git a/mafiasi/jabber/static/css/jabber.css b/mafiasi/jabber/static/css/jabber.css
deleted file mode 100644
index dcdc0926..00000000
--- a/mafiasi/jabber/static/css/jabber.css
+++ /dev/null
@@ -1,77 +0,0 @@
-#gajim-jabber-config-img {
-	position: relative;
-	width: 531px;
-	height: 220px;
-	background: url(../img/gajim-en.png);
-	font-size: 14px;
-	margin: 1em;
-}
-
-#gajim-jabber-config-username {
-	position: absolute;
-	top: 58px;
-	left: 103px;
-}
-
-#gajim-jabber-config-server {
-	position: absolute;
-	top: 58px;
-	left: 315px;
-}
-
-#dino-jabber-config-img {
-	position: relative;
-	width: 402px;
-	height: 255px;
-	background: url(../img/dino-en.png);
-	font-size: 15px;
-	margin: 1em;
-}
-
-#dino-jabber-config-username {
-	position: absolute;
-	top: 128px;
-	left: 63px;
-}
-
-#pidgin-jabber-config-img {
-	position: relative;
-	width: 397px;
-	height: 509px;
-	background: url(../img/pidgin-en.png);
-	font-size: 12px;
-	margin: 1em;
-}
-
-#pidgin-jabber-config-username {
-	position: absolute;
-	top: 105px;
-	left: 190px;
-}
-
-#pidgin-jabber-config-domain {
-	position: absolute;
-	top: 132px;
-	left: 190px;
-}
-
-#pidgin-jabber-config-alias {
-	position: absolute;
-	top: 272px;
-	left: 190px;
-}
-
-#conversations-jabber-config-img {
-	position: relative;
-	width: 400px;
-	height: 445px;
-	background: url(../img/conversations-en.png);
-	font-size: 15px;
-	margin: 1em;
-}
-
-#conversations-jabber-config-username {
-	position: absolute;
-	top: 143px;
-	left: 33px;
-}
diff --git a/mafiasi/jabber/static/img/conversations-en.png b/mafiasi/jabber/static/img/conversations-en.png
deleted file mode 100644
index 83761ee1..00000000
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diff --git a/mafiasi/jabber/static/img/dino-en.png b/mafiasi/jabber/static/img/dino-en.png
deleted file mode 100644
index 6d1ef8e8..00000000
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diff --git a/mafiasi/jabber/static/img/gajim-en.png b/mafiasi/jabber/static/img/gajim-en.png
deleted file mode 100644
index 853f7fcb..00000000
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diff --git a/mafiasi/jabber/static/img/pidgin-en.png b/mafiasi/jabber/static/img/pidgin-en.png
deleted file mode 100644
index 258fe508..00000000
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diff --git a/mafiasi/jabber/static/js/jabber.js b/mafiasi/jabber/static/js/jabber.js
deleted file mode 100644
index 18089fd5..00000000
--- a/mafiasi/jabber/static/js/jabber.js
+++ /dev/null
@@ -1,4 +0,0 @@
-$('#jabber-screenshot-tabs a').click(function (e) {
-    e.preventDefault()
-    $(this).tab('show')
-})
diff --git a/mafiasi/jabber/templates/jabber/index.html b/mafiasi/jabber/templates/jabber/index.html
deleted file mode 100644
index 725830d0..00000000
--- a/mafiasi/jabber/templates/jabber/index.html
+++ /dev/null
@@ -1,99 +0,0 @@
-{% extends "base.html" %}
-{% load i18n %}
-{% load static %}
-
-{% block wtitle %}{% block ptitle %}{% trans "Jabber" %}{% endblock %}{% endblock %}
-
-{% block content %}
-<div class="alert alert-info">
-{% if user.username != jabber_user.username %}
-{% blocktrans with username=jabber_user.username %}Your Jabber ID is <strong>{{ username }}</strong>@{{ jabber_domain }}. Note: it's different from your username.{% endblocktrans %}
-{% else %}
-{% blocktrans with username=jabber_user.username %}Your Jabber ID is <strong>{{ username }}@{{ jabber_domain }}</strong>.{% endblocktrans %}
-{% endif %}
-</div>
-
-{% url 'registration_account' as account_url %}
-{% blocktrans %}<p>If you want to change your Jabber password, just change it in your <a href="{{ account_url }}">account settings</a>.</p>{% endblocktrans %}
-
-<p>{% trans "The fingerprint of the current SSL certificate is:" %}<br />
-<span style="white-space:pre;font-family:monospace;">{{ cert_fingerprint }}</span></p>
-
-<h3>{% trans 'Configure your Jabber Client' %}</h3>
-<p>
-  {% blocktrans %}
-    In order to use Jabber, you need to install a Jabber client and configure it
-    to connect to the Mafiasi server. One option is <a href="https://gajim.org"
-    target="_blank">Gajim</a>, which is recommended by us.
-  {% endblocktrans %}
-<p>
-
-<p>
-  {% blocktrans %}
-    For Android systems, we recommend using
-    <a href="https://conversations.im" target="_blank">Conversations</a>, which is
-    a free Jabber client. It is available for free on F-Droid or paid on the
-    Play Store.
-  {% endblocktrans %}
-</p>
-
-<p>
-  {% blocktrans %}
-    Below you can see the required configuration for Gajim, Dino, Pidgin and Conversations.
-  {% endblocktrans %}
-</p>
-
-
-<div id="jabber-screenshot-tabs">
-  <ul class="nav nav-tabs" role="tablist">
-    <li role="presentation" class="active"><a href="#gajim" role="tab" data-toggle="tab">Gajim</a></li>
-    <li role="presentation"><a href="#dino" role="tab" data-toggle="tab">Dino</a></li>
-    <li role="presentation"><a href="#pidgin" role="tab" data-toggle="tab">Pidgin</a></li>
-    <li role="presentation"><a href="#conversations" role="tab" data-toggle="tab">Conversations</a></li>
-  </ul>
-
-  <div class="tab-content">
-    <div role="tabpanel" class="tab-pane active" id="gajim">
-      <div id="gajim-jabber-config-img">
-        <div id="gajim-jabber-config-username">
-          {{ jabber_user.username }}
-        </div>
-        <div id="gajim-jabber-config-server">
-          {{ jabber_domain }}
-        </div>
-      </div>
-    </div>
-    <div role="tabpanel" class="tab-pane" id="dino">
-      <div id="dino-jabber-config-img">
-        <div id="dino-jabber-config-username">
-          {{ jabber_user.username }}@{{ jabber_domain }}
-        </div>
-      </div>
-    </div>
-    <div role="tabpanel" class="tab-pane" id="pidgin">
-      <div id="pidgin-jabber-config-img">
-        <div id="pidgin-jabber-config-username">
-          {{ jabber_user.username }}
-        </div>
-        <div id="pidgin-jabber-config-domain">{{ jabber_domain }}</div>
-        <div id="pidgin-jabber-config-alias">{{ user_display_name }}</div>
-      </div>
-    </div>
-    <div role="tabpanel" class="tab-pane" id="conversations">
-      <div id="conversations-jabber-config-img">
-        <div id="conversations-jabber-config-username">
-          {{ jabber_user.username }}@{{ jabber_domain }}
-        </div>
-      </div>
-    </div>
-  </div>
-</div>
-
-{% endblock %}
-
-{% block css %}
-<link rel="stylesheet" type="text/css" href="{% static 'css/jabber.css' %}"/>
-{% endblock %}
-{% block js %}
-  <script type="text/javascript" src="{% static 'js/jabber.js' %}"></script>
-{% endblock js %}
diff --git a/mafiasi/jabber/urls.py b/mafiasi/jabber/urls.py
deleted file mode 100644
index 45a00541..00000000
--- a/mafiasi/jabber/urls.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from django.urls import path
-
-from .views import index
-
-urlpatterns = [
-    path("", index, name="jabber_index"),
-]
diff --git a/mafiasi/jabber/views.py b/mafiasi/jabber/views.py
deleted file mode 100644
index d0710119..00000000
--- a/mafiasi/jabber/views.py
+++ /dev/null
@@ -1,26 +0,0 @@
-from django.conf import settings
-from django.contrib import messages
-from django.contrib.auth.decorators import login_required
-from django.shortcuts import redirect
-from django.template.response import TemplateResponse
-from django.utils.translation import gettext_lazy as _
-
-from mafiasi.jabber.models import get_or_create_account
-from mafiasi.registration.forms import CheckPasswordForm
-
-
-@login_required
-def index(request):
-    jabber_user = get_or_create_account(request.user)
-    user_display_name = request.user.get_ldapuser().display_name
-
-    return TemplateResponse(
-        request,
-        "jabber/index.html",
-        {
-            "jabber_user": jabber_user,
-            "user_display_name": user_display_name,
-            "jabber_domain": settings.JABBER_DOMAIN,
-            "cert_fingerprint": settings.JABBER_CERT_FINGERPRINT,
-        },
-    )
diff --git a/mafiasi/mattermost/__init__.py b/mafiasi/mattermost/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/mafiasi/mattermost/apps.py b/mafiasi/mattermost/apps.py
deleted file mode 100644
index 41823cd6..00000000
--- a/mafiasi/mattermost/apps.py
+++ /dev/null
@@ -1,14 +0,0 @@
-from django.conf import settings
-from django.utils.translation import gettext_lazy as _
-
-from mafiasi.base.base_apps import BaseService
-
-
-class MattermostConfig(BaseService):
-    default = True
-    name = "mafiasi.mattermost"
-    verbose_name = "Mattermost"
-    title = _("Chat")
-    description = _("An online team chat service")
-    link = settings.MATTERMOST_URL
-    image = "img/services/mattermost.svg"
diff --git a/mafiasi/mattermost/urls.py b/mafiasi/mattermost/urls.py
deleted file mode 100644
index 43aeb0ff..00000000
--- a/mafiasi/mattermost/urls.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from django.urls import path
-
-from .views import get_user_info
-
-urlpatterns = [
-    path("user", get_user_info, name="mattermost_get_user_info"),
-]
diff --git a/mafiasi/mattermost/views.py b/mafiasi/mattermost/views.py
deleted file mode 100644
index 0dbdd34e..00000000
--- a/mafiasi/mattermost/views.py
+++ /dev/null
@@ -1,17 +0,0 @@
-from django.http import JsonResponse
-from oauth2_provider.decorators import protected_resource
-
-
-@protected_resource()
-def get_user_info(request):
-    user = request.resource_owner
-
-    return JsonResponse(
-        {
-            "id": user.id,
-            "username": user.get_username(),
-            "login": user.get_username(),
-            "email": user.email,
-            "name": user.get_full_name(),
-        }
-    )
diff --git a/mafiasi/settings.py b/mafiasi/settings.py
index 92fcc30b..a3ef7fe2 100644
--- a/mafiasi/settings.py
+++ b/mafiasi/settings.py
@@ -13,7 +13,6 @@
 TESTING = env.bool("MAFIASI_TESTING", default=False)
 
 # Feature toggles
-ENABLE_JABBER_INTEGRATION = env.bool("MAFIASI_ENABLE_JABBER_INTEGRATION")
 ENABLE_EP_INTEGRATION = env.bool("MAFIASI_ENABLE_EP_INTEGRATION")
 ENABLE_VAULT_INTEGRATION = env.bool("MAFIASI_ENABLE_VAULT_INTEGRATION")
 
@@ -164,7 +163,6 @@
         "mafiasi.pks",
         "mafiasi.kanboard",
         "mafiasi.whiteboard",
-        "mafiasi.mattermost",
         "mafiasi.discourse",
         "mafiasi.fb18",
         ###
@@ -274,20 +272,6 @@
     },
 ]
 
-if ENABLE_JABBER_INTEGRATION:
-    JABBER_DOMAIN = "jabber.mafiasi.de"
-    JABBER_CERT_FINGERPRINT_FILE = str(env.path("MAFIASI_JABBER_CERT_FINGERPRINT_FILE"))
-    if os.path.isfile(JABBER_CERT_FINGERPRINT_FILE):
-        JABBER_CERT_FINGERPRINT = (
-            subprocess.check_output(["openssl", "x509", "-in", JABBER_CERT_FINGERPRINT_FILE, "-noout", "-fingerprint"])
-            .decode()
-            .strip()
-        )
-    else:
-        JABBER_CERT_FINGERPRINT = ""
-    INSTALLED_APPS.insert(INSTALLED_APPS.index("mafiasi.mattermost"), "mafiasi.jabber")
-    DATABASES["jabber"] = env.dj_db_url("MAFIASI_DB_JABBER", default="sqlite://:memory:")
-
 if ENABLE_EP_INTEGRATION:
     DATABASES["etherpad"] = env.dj_db_url("MAFIASI_DB_ETHERPAD", default="sqlite://:memory:")
     ETHERPAD_API_KEY = env.str("MAFIASI_EP_API_KEY")
@@ -298,8 +282,6 @@
     VAULT_URL = env.str("MAFIASI_VAULT_URL", default="https://vault.mafiasi.de")
     VAULT_ADMIN_TOKEN = env.str("MAFIASI_VAULT_ADMIN_TOKEN")
 
-DATABASE_ROUTERS = ["mafiasi.jabber.dbrouter.JabberRouter", "ldapdb.router.Router"]
-
 PROJECT_NAME = "mafiasi.de"
 PROJECT_BANNER = "Mafiasi Hub"
 BANNER_IMG = ""
@@ -315,7 +297,6 @@
 SOGO_URL = "https://sogo.mafiasi.de"
 GIT_URL = "https://git.mafiasi.de"
 TAUSCHEN_URL = "https://tauschen.mafiasi.de"
-MATTERMOST_URL = "https://mattermost.mafiasi.de"
 NEXTCLOUD_URL = "https://cloud.mafiasi.de"
 JITSI_URL = "https://conference.mafiasi.de"
 DISCOURSE_URL = "https://archiv.mafiasi.de/forum/discourse"