diff --git a/src/include/Commons.h b/src/include/Commons.h
index a9370909ee9a1f79a6a35e408f591a9b8766852b..7e4d2520719a82fbebcee2198797bb11ad335562 100644
--- a/src/include/Commons.h
+++ b/src/include/Commons.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file Commons.h
  *
diff --git a/src/include/Configuration.h b/src/include/Configuration.h
index 726f7471bdbbc784cb4d370e411d3c1634df9c58..6ac9417969c84928f7fa51959d3a014b46f07eac 100644
--- a/src/include/Configuration.h
+++ b/src/include/Configuration.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file Configuration.h
  *
diff --git a/src/include/TransitionMatrix.h b/src/include/TransitionMatrix.h
index 6adb60f763132a0c1b9895709763e5506f7f2bbc..b5a093bb745c7f125652cecd2ce5261c26ec6ff4 100644
--- a/src/include/TransitionMatrix.h
+++ b/src/include/TransitionMatrix.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file TransitionMatrix.h
  *
diff --git a/src/include/algebraic.h b/src/include/algebraic.h
index efd13cf77de5c430060b1f0c248f637839983150..fe06bbaf2d8748673740f5669f0edf7795c48b5b 100644
--- a/src/include/algebraic.h
+++ b/src/include/algebraic.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file algebraic.h
  *
diff --git a/src/include/clu_subs.h b/src/include/clu_subs.h
index 2360c0607913b3f2939c7ce3a4219943f02bdc5d..3a94928ff5002170ddfa4447d7df74396c6c6fa8 100644
--- a/src/include/clu_subs.h
+++ b/src/include/clu_subs.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file clu_subs.h
  *
diff --git a/src/include/lapack_calls.h b/src/include/lapack_calls.h
index 5165ceca0df53c4b29bcf0441557a27ce6a512be..0abfd747d43da0a427c65c8ea7ad3376bcef4a0c 100644
--- a/src/include/lapack_calls.h
+++ b/src/include/lapack_calls.h
@@ -1,6 +1,19 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
 
-/*! \file lapack_calss.h
+   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.
+ */
+
+/*! \file lapack_calls.h
  *
  * \brief C++ interface to LAPACK calls.
  *
diff --git a/src/include/logging.h b/src/include/logging.h
index a8818ea4b2e6f18635e5f1b0a0345ce2d55e1c75..31a89025da07520789bdfc1b83ca1da03e78e755 100644
--- a/src/include/logging.h
+++ b/src/include/logging.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file logging.h
  *
diff --git a/src/include/sph_subs.h b/src/include/sph_subs.h
index 427ae3a63af00fa92a1d2df86a8babcbaa91746c..4fef0bd5c8933c60ff5b2f9cced0b556899e71dd 100644
--- a/src/include/sph_subs.h
+++ b/src/include/sph_subs.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file sph_subs.h
  *
diff --git a/src/include/tfrfme.h b/src/include/tfrfme.h
index 8f271819242be698c859d58ff3956e12c465cf82..d6ef0cbfde1232ec68184d592efa924649236fec 100644
--- a/src/include/tfrfme.h
+++ b/src/include/tfrfme.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file tfrfme.h
  *
diff --git a/src/include/tra_subs.h b/src/include/tra_subs.h
index 37e728507fe71f9444d7f1fd405044b2aad6e3e4..132d0fd8d16a595f54f47ffcf54cbc7b17f73640 100644
--- a/src/include/tra_subs.h
+++ b/src/include/tra_subs.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file tra_subs.h
  *
diff --git a/src/include/types.h b/src/include/types.h
index 8c6ab4b214a0e8cfe10c07f3d8b7823897b73533..e258c75e8bfa6a448de8f5a35dddfbbef5f2e170 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -1,4 +1,17 @@
-/* Distributed under the terms of GPLv3 or later. See COPYING for details. */
+/* Copyright 2024 INAF - Osservatorio Astronomico di Cagliari
+
+   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.
+ */
 
 /*! \file types.h
  *