This is the source code for the computer games Heretic & Hexen by Raven Software. The source was originally published under a restrictive EULA in January 1999. After a long campaign by members of the online Doom community, it was re-licensed under the GNU Public License, version 2, in 2008 and published on Source Forge.
For more information on the history of the source code, please see http://doomwiki.org/wiki/Raven_source_code_licensing
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.