Source:
http://swanmodel.sourceforge.net/support/copyright_and_liability.htm

Copyright and Liability  

* The SWAN program is freely available to all developers under the terms of the GNU General Public License. On the first page of all parts of the source code, i.e. subroutines, functions and modules, the following text is attached:


* SWAN (Simulating WAves Nearshore); a third generation wave model Copyright © 1993-2011 Delft University of Technology

* 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.

* A copy of the GNU General Public License is available at http://www.gnu.org/copyleft/gpl.html#SEC3 or by writing to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA