"So we come to John Carmack's comments on Beyond3D. It seems to be his philosophy that patents should not exist. Certainly id are altruistic in making their game engines public (crucially after a certain period of time has elapsed), but that is a unique stance & frankly outside the scope of this discussion. However, as can be seen from this example Creative created a graphics technique in 1999 & despite the pace of graphics development it is still applicable 5 years later. The same cannot be said for game engines - no matter how good they are when they first launch"
Would you like to know more? In case you're wondering, this Creative employee is referring to an Unreal patch that was released by Creative in 1999 which supported these stencil shadows, i.e. 5 years before Doom 3 was released. Still, not exactly the "best" worded response Creative could have made on the matter.