Hi Heidi,
I just wanted to echo what Tom said: get advice from a lawyer who specializes in copyright law. I have a law degree and I wouldn't sign anything pertaining to my own financial future without running it past somebody who deals with copyright on a daily basis. It's just too important.
Here's a site that might help you somewhat, I don't know if it's posted elsewhere on the Forum:
http://www.arts.endow.gov/artforms/M...opyright2.html
Good luck and keep us posted.