"Like any company Creative owns a number of technology patents and like any company we need to ensure that our patents are protected. Simply allowing another company to knowingly use a patent you own weakens your position and future claims against infringement. We therefore had to find a legally acceptable way to allow id to use this technique without it being seen as an infringement. The goal was the same from id's perspective"
[...]
"So with this deal everybody wins. The world gets to play DoomIII with the optimized shadowing technique, id did not have to pay any cash or royalties and Creative gets to add EAX into the DoomIII engine and make it available to gamers everywhere"