Permission is granted to copy, distribute, modify and/or use this software
(the SGP package) under the terms of the Creative Commons
Attribution-Share Alike 3.0 United States License.  To view a copy of this license, visit
http://creativecommons.org/licenses/by-sa/3.0/us/ or send a letter to Creative Commons,
171 Second Street, Suite 300, San Francisco, California, 94105, USA.