diff --git a/base/src/main/java/de/staropensource/sosengine/base/annotations/EventListener.java b/base/src/main/java/de/staropensource/sosengine/base/annotations/EventListener.java
index 8cc569b..fbadd1e 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/annotations/EventListener.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/annotations/EventListener.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.staropensource.sosengine.base.annotations;
 
 import de.staropensource.sosengine.base.classes.Event;
diff --git a/base/src/main/java/de/staropensource/sosengine/base/annotations/package-info.java b/base/src/main/java/de/staropensource/sosengine/base/annotations/package-info.java
index af31de9..b058a1f 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/annotations/package-info.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/annotations/package-info.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Contains annotations.
  *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/classes/Event.java b/base/src/main/java/de/staropensource/sosengine/base/classes/Event.java
index 015a4c9..4d04e7d 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/classes/Event.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/classes/Event.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.staropensource.sosengine.base.classes;
 
 import de.staropensource.sosengine.base.annotations.EventListener;
diff --git a/base/src/main/java/de/staropensource/sosengine/base/classes/package-info.java b/base/src/main/java/de/staropensource/sosengine/base/classes/package-info.java
index 672191c..b986681 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/classes/package-info.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/classes/package-info.java
@@ -18,7 +18,7 @@
  */
 
 /**
- * Contains various interfaces.
+ * Contains various interfaces and abstract classes.
  *
  * @since 1-alpha0
  */
diff --git a/base/src/main/java/de/staropensource/sosengine/base/data/info/package-info.java b/base/src/main/java/de/staropensource/sosengine/base/data/info/package-info.java
index d9eb21c..eae38a5 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/data/info/package-info.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/data/info/package-info.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Provides various classes that can be used to retrieve information about the engine or JVM.
  */
diff --git a/base/src/main/java/de/staropensource/sosengine/unittests/UnitConfig.java b/base/src/main/java/de/staropensource/sosengine/unittests/UnitConfig.java
index 1f8bf13..1ed8616 100644
--- a/base/src/main/java/de/staropensource/sosengine/unittests/UnitConfig.java
+++ b/base/src/main/java/de/staropensource/sosengine/unittests/UnitConfig.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.staropensource.sosengine.unittests;
 
 import de.staropensource.sosengine.base.types.LogLevel;
diff --git a/base/src/main/java/de/staropensource/sosengine/unittests/UnitLogger.java b/base/src/main/java/de/staropensource/sosengine/unittests/UnitLogger.java
index 29efd2d..4f1718c 100644
--- a/base/src/main/java/de/staropensource/sosengine/unittests/UnitLogger.java
+++ b/base/src/main/java/de/staropensource/sosengine/unittests/UnitLogger.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package de.staropensource.sosengine.unittests;
 
 import de.staropensource.sosengine.base.types.LogLevel;
diff --git a/base/src/main/java/de/staropensource/sosengine/unittests/package-info.java b/base/src/main/java/de/staropensource/sosengine/unittests/package-info.java
index 8ae2ea8..0a042c7 100644
--- a/base/src/main/java/de/staropensource/sosengine/unittests/package-info.java
+++ b/base/src/main/java/de/staropensource/sosengine/unittests/package-info.java
@@ -1,3 +1,22 @@
+/*
+    STAROPENSOURCE ENGINE SOURCE FILE
+    Copyright (c) 2024 The StarOpenSource Engine Contributors
+    Licensed under the GNU Affero General Public License v3
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Classes in this package are designed to be used within unit tests.
  * They aim at simplifying certain aspects of unit testing.