Activision and Raven are releasing this code for people to learn from and play with. 
This code is copyright Activision 2003. This source is released under GNU GPLv2.


Some source code in this release is not covered by the GPL:
e.g.
zlib is Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler


  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.