diff --git a/BGL/include/CGAL/boost/graph/IO/3MF.h b/BGL/include/CGAL/boost/graph/IO/3MF.h
index 1fc0831a501..5345b449c1d 100644
--- a/BGL/include/CGAL/boost/graph/IO/3MF.h
+++ b/BGL/include/CGAL/boost/graph/IO/3MF.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/GOCAD.h b/BGL/include/CGAL/boost/graph/IO/GOCAD.h
index 3bc7d8f4b4f..4e6498c1daa 100644
--- a/BGL/include/CGAL/boost/graph/IO/GOCAD.h
+++ b/BGL/include/CGAL/boost/graph/IO/GOCAD.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/INP.h b/BGL/include/CGAL/boost/graph/IO/INP.h
index 7eb28ea62ad..6822f341f9a 100644
--- a/BGL/include/CGAL/boost/graph/IO/INP.h
+++ b/BGL/include/CGAL/boost/graph/IO/INP.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/OBJ.h b/BGL/include/CGAL/boost/graph/IO/OBJ.h
index 9ab8b4deed6..a433b831846 100644
--- a/BGL/include/CGAL/boost/graph/IO/OBJ.h
+++ b/BGL/include/CGAL/boost/graph/IO/OBJ.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/OFF.h b/BGL/include/CGAL/boost/graph/IO/OFF.h
index 48fa4f9381f..e9b8e9a8b58 100644
--- a/BGL/include/CGAL/boost/graph/IO/OFF.h
+++ b/BGL/include/CGAL/boost/graph/IO/OFF.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
@@ -7,6 +7,7 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
 //
 // Author(s)     : Andreas Fabri
+//                 Mael Rouxel-Labbé
 
 #ifndef CGAL_BGL_IO_OFF_H
 #define CGAL_BGL_IO_OFF_H
diff --git a/BGL/include/CGAL/boost/graph/IO/PLY.h b/BGL/include/CGAL/boost/graph/IO/PLY.h
index 6f1b79d471b..c497cb2fc44 100644
--- a/BGL/include/CGAL/boost/graph/IO/PLY.h
+++ b/BGL/include/CGAL/boost/graph/IO/PLY.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/STL.h b/BGL/include/CGAL/boost/graph/IO/STL.h
index f91bd7d9675..d4b12fef865 100644
--- a/BGL/include/CGAL/boost/graph/IO/STL.h
+++ b/BGL/include/CGAL/boost/graph/IO/STL.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/VTK.h b/BGL/include/CGAL/boost/graph/IO/VTK.h
index a0585a14795..ab063b67b7b 100644
--- a/BGL/include/CGAL/boost/graph/IO/VTK.h
+++ b/BGL/include/CGAL/boost/graph/IO/VTK.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/WRL.h b/BGL/include/CGAL/boost/graph/IO/WRL.h
index bd179ef1263..d724d32b88a 100644
--- a/BGL/include/CGAL/boost/graph/IO/WRL.h
+++ b/BGL/include/CGAL/boost/graph/IO/WRL.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  GeometryFactory (France).  All rights reserved.
+// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
 //
diff --git a/BGL/include/CGAL/boost/graph/IO/polygon_mesh_io.h b/BGL/include/CGAL/boost/graph/IO/polygon_mesh_io.h
index b4b7241e1b4..681d849f6bd 100644
--- a/BGL/include/CGAL/boost/graph/IO/polygon_mesh_io.h
+++ b/BGL/include/CGAL/boost/graph/IO/polygon_mesh_io.h
@@ -7,6 +7,7 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
 //
 // Author(s)     : Maxime Gimeno
+//                 Mael Rouxel-Labbé
 
 #ifndef CGAL_BOOST_GRAPH_POLYGON_MESH_IO_H
 #define CGAL_BOOST_GRAPH_POLYGON_MESH_IO_H
diff --git a/Stream_support/include/CGAL/IO/3MF.h b/Stream_support/include/CGAL/IO/3MF.h
index 674d79c93b9..bc05b8e15dc 100644
--- a/Stream_support/include/CGAL/IO/3MF.h
+++ b/Stream_support/include/CGAL/IO/3MF.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015 GeometryFactory
+// Copyright (c) 2015-2020 GeometryFactory
 //
 // This file is part of CGAL (www.cgal.org);
 //
diff --git a/Stream_support/include/CGAL/IO/OBJ.h b/Stream_support/include/CGAL/IO/OBJ.h
index 0fa8218324b..a96d76c8c51 100644
--- a/Stream_support/include/CGAL/IO/OBJ.h
+++ b/Stream_support/include/CGAL/IO/OBJ.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  Geometry Factory
+// Copyright (c) 2015-2020  Geometry Factory
 // All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
diff --git a/Stream_support/include/CGAL/IO/OFF.h b/Stream_support/include/CGAL/IO/OFF.h
index 76cb18d086b..327af08b4b1 100644
--- a/Stream_support/include/CGAL/IO/OFF.h
+++ b/Stream_support/include/CGAL/IO/OFF.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015 GeometryFactory
+// Copyright (c) 2015-2020 GeometryFactory
 //
 // This file is part of CGAL (www.cgal.org);
 //
diff --git a/Stream_support/include/CGAL/IO/PLY.h b/Stream_support/include/CGAL/IO/PLY.h
index fd127d2aa7b..b5afb8e1552 100644
--- a/Stream_support/include/CGAL/IO/PLY.h
+++ b/Stream_support/include/CGAL/IO/PLY.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015  Geometry Factory
+// Copyright (c) 2015-2020  Geometry Factory
 // All rights reserved.
 //
 // This file is part of CGAL (www.cgal.org)
diff --git a/Stream_support/include/CGAL/IO/STL.h b/Stream_support/include/CGAL/IO/STL.h
index 26974cdb7e7..a86994b2a82 100644
--- a/Stream_support/include/CGAL/IO/STL.h
+++ b/Stream_support/include/CGAL/IO/STL.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018  GeometryFactory Sarl (France).
+// Copyright (c) 2018-2020  GeometryFactory Sarl (France).
 // All rights reserved.
 //
 // Licensees holding a valid commercial license may use this file in
diff --git a/Stream_support/include/CGAL/IO/VTK.h b/Stream_support/include/CGAL/IO/VTK.h
index 1c44865ccf4..2788fe7bc79 100644
--- a/Stream_support/include/CGAL/IO/VTK.h
+++ b/Stream_support/include/CGAL/IO/VTK.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018  GeometryFactory Sarl (France).
+// Copyright (c) 2018-2020  GeometryFactory Sarl (France).
 // All rights reserved.
 //
 // Licensees holding a valid commercial license may use this file in
diff --git a/Stream_support/include/CGAL/IO/WKT.h b/Stream_support/include/CGAL/IO/WKT.h
index 65b7473e860..ba4e9183fdb 100644
--- a/Stream_support/include/CGAL/IO/WKT.h
+++ b/Stream_support/include/CGAL/IO/WKT.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018  GeometryFactory Sarl (France).
+// Copyright (c) 2018-2020  GeometryFactory Sarl (France).
 // All rights reserved.
 //
 // Licensees holding a valid commercial license may use this file in
diff --git a/Stream_support/include/CGAL/IO/io.h b/Stream_support/include/CGAL/IO/io.h
index 70465314fea..74e6ffacfd8 100644
--- a/Stream_support/include/CGAL/IO/io.h
+++ b/Stream_support/include/CGAL/IO/io.h
@@ -1,4 +1,5 @@
-// Copyright (c) 1997
+// Copyright (c) 1997-2020
+//
 // Utrecht University (The Netherlands),
 // ETH Zurich (Switzerland),
 // INRIA Sophia-Antipolis (France),