OpFor itself is released under the following license:

Copyright (c) 2008-2011 Brian Haskin Jr.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.


The game of Arimaa is covered by the following:

This software is being provided with a written authorization from Arimaa.com
and in compliance with "Section 3 of the Arimaa Public License".
Authorization #90819. Any rights granted by the end user license of this
software apply only to this software and do not extend to the Arimaa game. The
end user is responsible to ensure that any derivate work based on this software
complies with the Arimaa Public License and obtain any authorization or license
by contacting Arimaa.com. The Arimaa name is a trademark of Arimaa.com. The
Arimaa game is patented. The Arimaa game rules, the Arimaa board design and the
Arimaa piece design are copyright protected. The Arimaa Public License allows
cost free use of the Arimaa game for non-commercial use.
Arimaa is a registered trademark of Omar Syed.