diff --git a/docs/08_concepts.adoc b/docs/08_concepts.adoc
index 569ac0e..b12b943 100644
--- a/docs/08_concepts.adoc
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@@ -49,19 +49,14 @@ on this list.
 image:08-Crosscutting-Concepts-Structure-EN.png["Possible topics for crosscutting concepts"]
 ****
 
-
-=== Domain model
-
-image:UmlDiagram.png["Example UML Diagram"]
-
-
-
-=== _<Concept 2>_
-
-_<explanation>_
-
-...
-
-=== _<Concept n>_
-
-_<explanation>_
+=== _Security_
+Security is extremely important as only authenticated users using a POD must be able to access
+the map view as well as the other functionalities. All routes are protected, so they are not accessed
+without this authentication.
+The backend is also protected from unauthorized requests.
+
+=== _Privacy_
+Privacy is extremely important as data from the user's locations and friends must not be seen
+or stored outside the PODS. In order to maintain this the RestAPI manages the communication with
+the frontend saving only the nicknames of the users on a database and all sensitive information
+on the PODs.