diff --git a/metronome/src/androidMain/kotlin/DefaultMetronomeMediaPlayer.kt b/metronome/src/androidMain/kotlin/DefaultMetronomeMediaPlayer.kt
index 55418850b..faec70b5e 100644
--- a/metronome/src/androidMain/kotlin/DefaultMetronomeMediaPlayer.kt
+++ b/metronome/src/androidMain/kotlin/DefaultMetronomeMediaPlayer.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 import android.media.AudioAttributes
diff --git a/metronome/src/commonMain/kotlin/DefaultMetronome.kt b/metronome/src/commonMain/kotlin/DefaultMetronome.kt
index 86793ff81..294a85f68 100644
--- a/metronome/src/commonMain/kotlin/DefaultMetronome.kt
+++ b/metronome/src/commonMain/kotlin/DefaultMetronome.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 import com.splendo.kaluga.logging.error
diff --git a/metronome/src/commonMain/kotlin/DefaultMetronomeMediaPlayer.kt b/metronome/src/commonMain/kotlin/DefaultMetronomeMediaPlayer.kt
index 07cc9df14..7d0990c00 100644
--- a/metronome/src/commonMain/kotlin/DefaultMetronomeMediaPlayer.kt
+++ b/metronome/src/commonMain/kotlin/DefaultMetronomeMediaPlayer.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 import com.splendo.kaluga.media.MediaSource
diff --git a/metronome/src/commonMain/kotlin/Metronome.kt b/metronome/src/commonMain/kotlin/Metronome.kt
index 556f5a0d6..1958db139 100644
--- a/metronome/src/commonMain/kotlin/Metronome.kt
+++ b/metronome/src/commonMain/kotlin/Metronome.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 import kotlinx.coroutines.flow.Flow
diff --git a/metronome/src/commonMain/kotlin/MetronomeError.kt b/metronome/src/commonMain/kotlin/MetronomeError.kt
index 9392aa6fb..3b8d24e0a 100644
--- a/metronome/src/commonMain/kotlin/MetronomeError.kt
+++ b/metronome/src/commonMain/kotlin/MetronomeError.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 sealed class MetronomeError(message: String) : Error(message) {
diff --git a/metronome/src/commonMain/kotlin/MetronomeMediaPlayer.kt b/metronome/src/commonMain/kotlin/MetronomeMediaPlayer.kt
index 02707de10..5d4cefd17 100644
--- a/metronome/src/commonMain/kotlin/MetronomeMediaPlayer.kt
+++ b/metronome/src/commonMain/kotlin/MetronomeMediaPlayer.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 interface MetronomeMediaPlayer : AutoCloseable {
diff --git a/metronome/src/iosMain/kotlin/DefaultMetronomeMediaPlayer.kt b/metronome/src/iosMain/kotlin/DefaultMetronomeMediaPlayer.kt
index e55ea684f..3485eb8a9 100644
--- a/metronome/src/iosMain/kotlin/DefaultMetronomeMediaPlayer.kt
+++ b/metronome/src/iosMain/kotlin/DefaultMetronomeMediaPlayer.kt
@@ -1,3 +1,20 @@
+/*
+ Copyright 2024 Splendo Consulting B.V. The Netherlands
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+ */
+
 package com.splendo.kaluga.metronome
 
 import com.splendo.kaluga.media.MediaSource