drmlessgames: Yes, but is it the only source? They placed the assets in the source release. id software doesnt put their game's data in their source releases. They, wolfire, too said that the assets were free to share but not to resale. In that case, icoder could sell their $2 port, and then offer instructions on how to obtain the free to share assets. I think Wolfire blundered by not putting the game assets clearly in a specific license. "Here's the assets, but don't sell 'em , bye" is not a proper license.
Oh, if that's the case that there are people that are allowed to distribute the other bits of the game without violating the license then I see your point. I didn't remember hearing anything to indicate that I could redistribute those portions of the game. And such a provision strikes me as odd.