APBS License

Primary author: Nathan A. Baker (baker@biochem.wustl.edu)
Department of Biochemistry and Molecular Biophysics
Center for Computational Biology
Washington University in St. Louis
Additional contributing authors are listed in the code documentation.

Copyright (c) 2002-2007. Washington University in St. Louis.
All Rights Reserved.
Copyright (c) 1999-2002. The Regents of the University of California.
Portions Copyright (c) 1995. Michael Holst.

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; either version 2 of the License, or (at your option) any later version.

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.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Linking APBS statically or dynamically with other modules is making a combined work based on APBS. Thus, the terms and conditions of the GNU General Public License cover the whole combination.

SPECIAL GPL EXCEPTION
In addition, as a special exception, the copyright holders of APBS give you permission to combine the APBS program with free software programs and libraries that are released under the GNU LGPL or with code included in releases of ISIM, Ion Simulator Interface, PMV, SMOL, VMD, and Vision. Such combined software may be linked with APBS and redistributed together in original or modified form as mere aggregation without requirement that the entire work be under the scope of the GNU General Public License. This special exception permission is also extended to any software listed in the SPECIAL GPL EXCEPTION clauses by the PMG, FEtk, MC, or MALOC libraries.

Note that people who make modified versions of APBS are not obligated to grant this special exception for their modified versions; it is their choice whether to do so. The GNU General Public License gives permission to release a modified version without this exception; this exception also makes it possible to release a modified version which carries forward this exception.