diff --git a/.clang-format b/.clang-format
index 537bac562..1c493308f 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,3 +1,6 @@
+# Author: Steffen Vogel <steffen.vogel@opal-rt.com>
+# SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
+# SPDX-License-Identifier: Apache-2.0
 ---
 BasedOnStyle: LLVM
 
diff --git a/.clangd b/.clangd
index bd2dd8854..6c614a474 100644
--- a/.clangd
+++ b/.clangd
@@ -1,3 +1,6 @@
+# Author: Steffen Vogel <steffen.vogel@opal-rt.com>
+# SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
+# SPDX-License-Identifier: Apache-2.0
 ---
 Diagnostics:
   UnusedIncludes: Strict
diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index b11003261..a2cf7c8ec 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -1,3 +1,7 @@
+# Author: Steffen Vogel <steffen.vogel@opal-rt.com>
+# SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
+# SPDX-License-Identifier: Apache-2.0
+
 # Introduced clang-format
 aa16979fdde7cd377977c38eaee02062c3908515
 
diff --git a/.mailmap b/.mailmap
index dd5725840..1cfb5ffe6 100644
--- a/.mailmap
+++ b/.mailmap
@@ -1,3 +1,8 @@
+# Author: Philipp Jungkamp <philipp.jungkamp@opal-rt.com>
+# SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
+# SPDX-License-Identifier: Apache-2.0
+---
+
 Anju <ameghwani@gmail.com>
 
 Dennis Potter <dennis@dennispotter.eu>