Re: [Trisquel-users] The Gaming Trap

[onpon4]

All of the Doom source code by id Software was also released under the GNU  
GPL. Odamex is derived from code under the GPL, and it's libre. The problem  
with Zandronum is it's derived from ZDoom, which contains additional Doom  
Source License code from other contributors (since that is the license the  
ZDoom project chose to use, I think mainly because the Doom Source License  
doesn't have as strong copyleft).