diff --git a/test/gtest_factor_gnss_displacement_2d.cpp b/test/gtest_factor_gnss_displacement_2d.cpp
index e4039c42502dd63f0e13e67a351a850a21b5c48c..9c89e6b1af41d76c5a390462c3edcd7dced05f65 100644
--- a/test/gtest_factor_gnss_displacement_2d.cpp
+++ b/test/gtest_factor_gnss_displacement_2d.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)
diff --git a/test/gtest_factor_gnss_displacement_3d.cpp b/test/gtest_factor_gnss_displacement_3d.cpp
index c3ea94f31656d0f131074111283dff61277d863e..ae0f108aa3c3d6a9540b2bf0cd357f21cb2ba09c 100644
--- a/test/gtest_factor_gnss_displacement_3d.cpp
+++ b/test/gtest_factor_gnss_displacement_3d.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)
diff --git a/test/gtest_factor_gnss_displacement_3d_with_clock.cpp b/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
index 884d8f887029e0e219108fbc73d4de61e321b03d..e1ee2530f5a556bdd179b8d815c67ae12632a28d 100644
--- a/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
+++ b/test/gtest_factor_gnss_displacement_3d_with_clock.cpp
@@ -1,3 +1,22 @@
+// WOLF - Copyright (C) 2020,2021,2022,2023
+// Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
+// Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
+// Joan Vallvé Navarro (jvallve@iri.upc.edu)
+// All rights reserved.
+//
+// This file is part of WOLF.
+// WOLF is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // WOLF - Copyright (C) 2020,2021,2022 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.
 // Authors: Joan Solà Ortega (jsola@iri.upc.edu) and
 // Joan Vallvé Navarro (jvallve@iri.upc.edu)