I'm not really sure. I should probably do some research, shouldn't I?
Grove Shuffler is Copyright (C) 2001-2003 Hal Canary, University of Wisconsin-Madison, and Kyle Petersen, Brandeis University.
Grove Shuffler comes with ABSOLUTELY NO WARRANTY. This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation.