diff --git a/Number_types/include/CGAL/Interval_traits.h b/Number_types/include/CGAL/Interval_traits.h
index c2120570d27..75b5d8333f9 100644
--- a/Number_types/include/CGAL/Interval_traits.h
+++ b/Number_types/include/CGAL/Interval_traits.h
@@ -1,11 +1,20 @@
-// TODO: Add licence
+// Copyright (c) 2008 Max-Planck-Institute Saarbruecken (Germany).
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); 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; version 2.1 of the License.
+// See the file LICENSE.LGPL distributed with CGAL.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
 //
 // This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 // WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 //
 // $URL$
 // $Id$
-//
+// 
 //
 // Author(s)     : Michael Hemmer <hemmer@mpi-inf.mpg.de>
 //
diff --git a/Number_types/include/CGAL/leda_bigfloat_interval.h b/Number_types/include/CGAL/leda_bigfloat_interval.h
index 934e9e00b99..36d05c941d4 100644
--- a/Number_types/include/CGAL/leda_bigfloat_interval.h
+++ b/Number_types/include/CGAL/leda_bigfloat_interval.h
@@ -1,3 +1,22 @@
+// Copyright (c) 2008 Max-Planck-Institute Saarbruecken (Germany).
+// All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org); 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; version 2.1 of the License.
+// See the file LICENSE.LGPL distributed with CGAL.
+//
+// Licensees holding a valid commercial license may use this file in
+// accordance with the commercial license agreement provided with the software.
+//
+// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+//
+// $URL$
+// $Id$
+// 
+//
+// Author(s)     : Michael Hemmer
 // TODO: add sign to RET