Incoming copy and paste:
My name is James Haley, and I represent an organization of Doom community members and game industry professionals who are making a public appeal to Raven Software and its parent company, Activision, Inc., to have the already-released source code of the games Heretic and Hexen transferred from a highly restrictive EULA to the GNU GPL.
Most of our organization members maintain GPL projects based on the Doom source code and would like to be able to extend support to these other Doom-engine games. Unfortunately, this incompatible license creates major problems.
An online copy of the open letter can be viewed at this URL: http://www.doomworld.com/eternity/letter.html