*They don't NEED to be re-written, because ignorance of copyright law is not a defense in the case of infringement - but it wouldn't hurt.

Information about copyright law in the US (which follows the* Bern convention*):

http://copyright.gov/

I'm talking end user license agreements!  Tell me if someone buys your poser product and used it in a video game are you content that you sold it a $10.00 and the game made $250,000.  Wouldn't  you want a little more?

Now if you have a rolling EULA you could say,  price for video game usage $1000.00 plus 5% royalties.  Tell me what would be so wrong with vendors re writing their EULA's to include video game usage and royalties?