Although the sources have been released, the artwork and other materials are still copyright and the game is thus still considered copyrighted. It can not legally be released on a Live CD or DVD.

This obviously would not prevent you from putting your own valid copy on a Live DVD for your own use, just from releasing it for others. That should pretty much be a matter of installing the Linux version and doing a remaster. Of course, that's easy for someone who has never done a remaster to say.