Under the d20STL you do yes. He was talking about going it alone where
indicating compatibilty is one of the acceptable uses of someone else's
trademarks: "Our bags fit Hoover vacuums."
Exactly. You need to not call a lot of attention to this compatibility -- it needs to be something that people looking for compatibility information can find without being so bloody large that it confuses the end user into believing it is a licensed product, etc.
Disclaimers are needed generally.
This is an area untested in some courts to my knowledge.
Lee
