id Software is still planning to release the Doom 3 source this year, but it's been delayed by a patent issuethat's causing John Carmack to personally rewrite some of the code. The patent issue in Doom 3 concerns theCarmack's Reverse algorithm and has led Carmack to rewrite it in the open-source Doom 3.

http://news.slashdot.org/story/11/11...e-code-release