diff --git a/src/algorithms/observables/libs/CMakeLists.txt b/src/algorithms/observables/libs/CMakeLists.txt
index dbb70d7b9..fec53a212 100644
--- a/src/algorithms/observables/libs/CMakeLists.txt
+++ b/src/algorithms/observables/libs/CMakeLists.txt
@@ -2,18 +2,7 @@
 #
 # This file is part of GNSS-SDR.
 #
-# GNSS-SDR 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.
-#
-# GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-3.0-or-later
 #
 
 set(OBSERVABLES_LIB_HEADERS ${OBSERVABLES_LIB_HEADERS} obs_conf.h)
diff --git a/src/algorithms/observables/libs/obs_conf.cc b/src/algorithms/observables/libs/obs_conf.cc
index d16e3eb66..be42811df 100644
--- a/src/algorithms/observables/libs/obs_conf.cc
+++ b/src/algorithms/observables/libs/obs_conf.cc
@@ -1,5 +1,5 @@
 /*!
- * \file obs_conf.h
+ * \file obs_conf.cc
  * \brief Class that contains all the configuration parameters for generic
  * observables block
  * \author Javier Arribas, 2020. jarribas(at)cttc.es
@@ -13,18 +13,7 @@
  *
  * This file is part of GNSS-SDR.
  *
- * GNSS-SDR 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.
- *
- * GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: GPL-3.0-or-later
  *
  * -------------------------------------------------------------------------
  */
diff --git a/src/algorithms/observables/libs/obs_conf.h b/src/algorithms/observables/libs/obs_conf.h
index 6f98cd61b..c523013c6 100644
--- a/src/algorithms/observables/libs/obs_conf.h
+++ b/src/algorithms/observables/libs/obs_conf.h
@@ -13,18 +13,7 @@
  *
  * This file is part of GNSS-SDR.
  *
- * GNSS-SDR 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.
- *
- * GNSS-SDR 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 GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: GPL-3.0-or-later
  *
  * -------------------------------------------------------------------------
  */