Edit the header of license.terms.

license.terms

@@ -1,6 +1,15 @@
-This software is copyrighted by Marc Culler, Nathan Dunfield, Matthias
-Goerner and others. The following terms apply to all files associated
-with the software unless explicitly disclaimed in individual files.
+This file describes the license terms for the software package TkGL.
+
+TkGL is copyrighted by Marc Culler ([email protected]),
+Nathan Dunfield ([email protected]), Matthias Goerner
+([email protected]) and others.  It is derived from the software
+package Togl, which is copyrighted by Brian Paul ([email protected]),
+Benjamin Bederson ([email protected]) and Greg Couch
+([email protected]), and which is licensed under the
+same terms.
+
+The following terms apply to all files associated with TkGL unless
+explicitly disclaimed in individual files.
 
 The authors hereby grant permission to use, copy, modify, distribute,
 and license this software and its documentation for any purpose, provided