To avoid some potential legal problems related to shadow rendering code Creative Labs apparently holds a patent to, id Software has decided to hold off on releasing the code. Rather than risking legal action, id Software co-founder John Carmack has decided to rewrite part of the Doom 3 engine's code. Yesterday it was revealed that id Software had delayed releasing the code to the public because of Bethesda's concerns of potential liability related to the Creative Labs patent.
According to a tweet from Carmack, Bethesda's lawyer's raised issues about the patent by Creative Labs for a stencil shadowing technique called “Carmack's Reverse” which was created by Carmack and other coders. id Software used the technique under contract for Doom 3, but because they are providing the source code to the public, using the technique might have caused a legal headache with Creative Labs.
Bethesda and id Software have not revealed when it will be released. Chances are, Carmack would say it will be released "when it's done."