Think about it.
If you are stealing someone Technology you wouldn't admitt that you are doing so. No need to defend yourself till you have to. When someone had to go to court, then they started to defend themselves. Why spend money and open a can of worms till you absolutely have to.
Think about it, again. Please read:
http://www.agoracom.com/ir/patriot/messages/686483#message
"Why spend money and open a can of worms" by licensing invalid patents.
Be well