I was contacted regarding a picture I had posted over on Flickr by a company that wants to use it in an e-book they are publishing. The contract/release contained the paragraphs below and I was wondering if this is something that I should be concerned with. I'm not familiar with these type of things and my skeptical side is wondering if this it typical language or if I should just say no. Any opinions, especially from some of the professionals among us would be appreciated. Neil The text: In return for the unrestricted use of my image(s) as granted to (production company), I shall receive a pro rata share of 25% of net proﬁts generated by Avena Productions from all sales of my image(s). I hereby agree that Avena Productions and all their assigns, heirs, and beneﬁciaries are granted full commercial rights to use, modify, display, sell, promote, or re-print and distribute, complete, or derivative works based on the photograph(s) in any form and for any purpose (except for pornographic or defamatory). I hereby waive any right to inspect or approve the ﬁnished version(s).