diff --git a/.editorconfig b/.editorconfig
index fbc2f393c..43461fa34 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,5 +1,10 @@
+# .editorconfig
+
 # see http://EditorConfig.org
 
+# SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 # This is the file in the root of the project.
 # For sub folders you can have other files that override only some settings.
 # For these, this settings should be false.
diff --git a/.gitignore b/.gitignore
index 3103df8d8..8a43e8d13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
 # Built application files
 *.apk
 *.ap_
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5342e6d2..0e017cb88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 # Changelog
 All notable changes to this project will be documented in this file.
 
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 3bcdff389..49e67aafd 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2018-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 In the Nextcloud community, participants from all over the world come together to create Free Software for a free internet. This is made possible by the support, hard work and enthusiasm of thousands of people, including those who create and use Nextcloud software.
 
 Our code of conduct offers some guidance to ensure Nextcloud participants can cooperate effectively in a positive and inspiring atmosphere, and to explain how together we can strengthen and support each other.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3bf77a53d..a778b58ed 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 # [Nextcloud](https://nextcloud.com) Talk for Android app
 
 # Index
diff --git a/README.md b/README.md
index c415ec28b..b050b4003 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 # [Nextcloud](https://nextcloud.com) Talk for Android :speech_balloon:
 
 [![Build Status](https://drone.nextcloud.com/api/badges/nextcloud/talk-android/status.svg)](https://drone.nextcloud.com/nextcloud/talk-android) [![Codacy Badge](https://app.codacy.com/project/badge/Grade/b89a720efbd24754984a776804913bca)](https://www.codacy.com/gh/nextcloud/talk-android/dashboard) [![Releases](https://img.shields.io/github/release/nextcloud/talk-android.svg)](https://github.com/nextcloud/talk-android/releases/latest)
diff --git a/SECURITY.md b/SECURITY.md
index b7b4cc7fe..4a991e128 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 # Security Policy
 
 ## Supported Versions
diff --git a/SETUP.md b/SETUP.md
index 6f91244af..96cf791a4 100644
--- a/SETUP.md
+++ b/SETUP.md
@@ -1,3 +1,7 @@
+<!--
+ ~ SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+ ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 # [Nextcloud](https://nextcloud.com) Talk for Android Setup Guide
 
 # Index
diff --git a/app/src/gplay/AndroidManifest.xml b/app/src/gplay/AndroidManifest.xml
index 7015fc328..10c70356c 100644
--- a/app/src/gplay/AndroidManifest.xml
+++ b/app/src/gplay/AndroidManifest.xml
@@ -1,25 +1,11 @@
 <!--
   ~ Nextcloud Talk application
   ~
-  ~ @author Mario Danic
-  ~ @author Tim Krüger
-  ~ Copyright (C) 2022 Tim Krüger <t@timkrueger.me>
-  ~ Copyright (C) 2017-2019 Mario Danic <mario@lovelyhq.com>
-  ~
-  ~ This program is free software: you can redistribute it and/or modify
-  ~ it under the terms of the GNU General Public License as published by
-  ~ the Free Software Foundation, either version 3 of the License, or
-  ~ at your option) any later version.
-  ~
-  ~ This program is distributed in the hope that it will be useful,
-  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
-  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  ~ GNU General Public License for more details.
-  ~
-  ~ You should have received a copy of the GNU General Public License
-  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
-  -->
-
+  ~ SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+  ~ SPDX-FileCopyrightText: 2022 Tim Krüger <t@timkrueger.me>
+  ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:tools="http://schemas.android.com/tools">
 
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 78ee53876..ae24affc5 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,25 +1,11 @@
 <!--
   ~ Nextcloud Talk application
   ~
-  ~ @author Mario Danic
-  ~ @author Marcel Hibbe
-  ~ Copyright (C) 2017-2019 Mario Danic <mario@lovelyhq.com>
-  ~ Copyright (C) 2021-2023 Marcel Hibbe <dev@mhibbe.de>
-  ~
-  ~ This program is free software: you can redistribute it and/or modify
-  ~ it under the terms of the GNU General Public License as published by
-  ~ the Free Software Foundation, either version 3 of the License, or
-  ~ at your option) any later version.
-  ~
-  ~ This program is distributed in the hope that it will be useful,
-  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
-  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  ~ GNU General Public License for more details.
-  ~
-  ~ You should have received a copy of the GNU General Public License
-  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
-  -->
-
+  ~ SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+  ~ SPDX-FileCopyrightText: 2021-2023 Marcel Hibbe <dev@mhibbe.de>
+  ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
@@ -87,7 +73,7 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
-    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <permission
         android:name="${applicationId}.${broadcastPermission}"
@@ -149,8 +135,8 @@
 
         <activity
             android:name=".conversationlist.ConversationsListActivity"
-            android:theme="@style/AppTheme"
-            android:exported="true">
+            android:exported="true"
+            android:theme="@style/AppTheme">
 
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />
@@ -192,17 +178,17 @@
         <activity
             android:name=".fullscreenfile.FullScreenImageActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
-            android:theme="@style/FullScreenImageTheme"/>
+            android:theme="@style/FullScreenImageTheme" />
 
         <activity
             android:name=".fullscreenfile.FullScreenMediaActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
-            android:theme="@style/FullScreenMediaTheme"/>
+            android:theme="@style/FullScreenMediaTheme" />
 
         <activity
             android:name=".fullscreenfile.FullScreenTextViewerActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
-            android:theme="@style/FullScreenTextTheme"/>
+            android:theme="@style/FullScreenTextTheme" />
 
         <activity
             android:name=".activities.TakePhotoActivity"
diff --git a/detekt.yml b/detekt.yml
index d38d10547..7a7c5d561 100644
--- a/detekt.yml
+++ b/detekt.yml
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
 build:
   maxIssues: 122
   weights:
diff --git a/gradle/verification-keyring.keys.license b/gradle/verification-keyring.keys.license
new file mode 100644
index 000000000..67f06b09c
--- /dev/null
+++ b/gradle/verification-keyring.keys.license
@@ -0,0 +1,2 @@
+# SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
diff --git a/gradle/verification-metadata.xml.license b/gradle/verification-metadata.xml.license
new file mode 100644
index 000000000..67f06b09c
--- /dev/null
+++ b/gradle/verification-metadata.xml.license
@@ -0,0 +1,2 @@
+# SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
diff --git a/gradle/wrapper/gradle-wrapper.jar.license b/gradle/wrapper/gradle-wrapper.jar.license
new file mode 100644
index 000000000..3f0600eb9
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar.license
@@ -0,0 +1,2 @@
+# SPDX-FileCopyrightText: 2015-2021 the original authors
+# SPDX-License-Identifier: Apache-2.0
diff --git a/spotbugs-filter.xml b/spotbugs-filter.xml
index c6620163a..6cdf090c1 100644
--- a/spotbugs-filter.xml
+++ b/spotbugs-filter.xml
@@ -1,30 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
-
 <!--
-  ~ Nextcloud Talk application
-  ~
-  ~ @author Mario Danic
-  ~ @author Andy Scherzinger
-  ~ @author Tim Krüger
-  ~ Copyright (C) 2021 Tim Krüger <t@timkrueger.me>
-  ~ Copyright (C) 2021 Andy Scherzinger <info@andy-scherzinger.de>
-  ~ Copyright (C) 2017-2019 Mario Danic <mario@lovelyhq.com>
-  ~
-  ~ This program is free software: you can redistribute it and/or modify
-  ~ it under the terms of the GNU General Public License as published by
-  ~ the Free Software Foundation, either version 3 of the License, or
-  ~ at your option) any later version.
-  ~
-  ~ This program is distributed in the hope that it will be useful,
-  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
-  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  ~ GNU General Public License for more details.
-  ~
-  ~ You should have received a copy of the GNU General Public License
-  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
-  -->
-
+  ~ Nextcloud Talk - Android Client
+  ~ 
+  ~ SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
+  ~ SPDX-FileCopyrightText: 2021 Andy Scherzinger <info@andy-scherzinger.de>
+  ~ SPDX-FileCopyrightText: 2021 Tim Krüger <t@timkrueger.me>
+  ~ SPDX-FileCopyrightText: 2017-2019 Mario Danic <mario@lovelyhq.com>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
 <FindBugsFilter>
     <Match>
         <Class name="~.*\.Manifest\$.*" />