For PDL::Graphics::PGPLOT::Map (an interface to the GMT map databases):

Copyright (c) 2000-2002 Douglas Hunt. All rights reserved. This program is free software;
you can redistribute it and/or modify it under the same terms as Perl itself. 


For the GMT system:

 /*--------------------------------------------------------------------
 *    THE GMT-system
 *
 *	Copyright (c) 1991-2000 by P. Wessel and W. H. F. Smith
 *	See COPYING file for copying and redistribution conditions.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; version 2 of the License.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	Contact info: www.soest.hawaii.edu/gmt
 *
 *--------------------------------------------------------------------*/
