Creative gives background to Doom III shadow story
 

And he added: "It is very funny that people are now saying "Creative blackmails id". You only have to think about this for a nanosecond to realise that Creative was in no position to blackmail anyone. Yes, we had to take a stance to protect our patent, but had we resolutely demanded what most companies in this situation would have, what do you think would have happened? It's very simple, id would have been forced to either pay a huge amount of cash or develop a less optimized method for shadowing that would have impacted performance and this may have caused the game to be delayed. On all counts Creative would have been publically vilified in the press. So blackmail, when id customers are our customers too?? I don't think so".

http://www.theinquirer.net/?article=17525