diff --git a/CMakeLists.txt b/CMakeLists.txt
index b782156f3e8312fb75321e407a9ad836b723ab7d..aa0b3aa480880da2df21fe6f23fc2d858fd77659 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 cmake_minimum_required (VERSION 3.9)
diff --git a/cmake/FindCONEX.cmake b/cmake/FindCONEX.cmake
index b55793223efb9a100c9fd005ae8a9036f886cc29..77ebd8377db256bebe679165b41b751fe2dbbf26 100644
--- a/cmake/FindCONEX.cmake
+++ b/cmake/FindCONEX.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 # - find Conex
diff --git a/cmake/FindPhysUnits.cmake b/cmake/FindPhysUnits.cmake
index 20fa1aaa4928ec0f37ce8ee573c7a4659756f98b..d645af7c2cbc9fbe3b8e87c151a21bf6d9241ccc 100644
--- a/cmake/FindPhysUnits.cmake
+++ b/cmake/FindPhysUnits.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 add_library (PhysUnits INTERFACE)
diff --git a/cmake/FindPythia8.cmake b/cmake/FindPythia8.cmake
index cbd3e75eed41ff3c8dbeae4ceeab55241f111abe..7e6592c063179fc8ffda687e81167a9d72cbe90b 100644
--- a/cmake/FindPythia8.cmake
+++ b/cmake/FindPythia8.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 #################################################
diff --git a/cmake/FindSphinx.cmake b/cmake/FindSphinx.cmake
index 62825ee4c3d14139ca371c9dd8d8f028da25181e..5083b74daaa92ad436036ada47842196b9a6ff3a 100644
--- a/cmake/FindSphinx.cmake
+++ b/cmake/FindSphinx.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 # Look for an executable called sphinx-build
diff --git a/cmake/corsikaConfig.cmake.in b/cmake/corsikaConfig.cmake.in
index 743e529eb41d14f43fac7d4d85298376233c977c..34ba7d199e44bf9f95825d86f1e71c359c52fa77 100644
--- a/cmake/corsikaConfig.cmake.in
+++ b/cmake/corsikaConfig.cmake.in
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 set (CORSIKA8_VERSION @c8_version@)
diff --git a/cmake/corsikaDefines.cmake b/cmake/corsikaDefines.cmake
index 57673ca03b2e37d9f1d8748f7a172873d7303cde..ecc5bbd8134c797fc8aebbbc38e7340580901bdf 100644
--- a/cmake/corsikaDefines.cmake
+++ b/cmake/corsikaDefines.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 
diff --git a/cmake/corsikaUtilities.cmake b/cmake/corsikaUtilities.cmake
index d9fd9f2e8b18f819920a25de5b03fbc4f424ef05..39b31e69296ffcc56a0d993f0dbaabf4ca72ce0e 100644
--- a/cmake/corsikaUtilities.cmake
+++ b/cmake/corsikaUtilities.cmake
@@ -3,9 +3,8 @@
 #
 # See file AUTHORS for a list of contributors.
 #
-# This software is distributed under the terms of the GNU General Public
-# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
-# the license.
+# This software is distributed under the terms of the 3-clause BSD license.
+# See file LICENSE for a full version of the license.
 #
 
 #################################################