This was just announced on the cc-community mailing list:
<http://s1.imagestamper.com/login.jsp>
"Stay copyright-safe
Using creative commons images? Prove you have the right with ImageStamper.
ImageStamper is a free tool for keeping dated, independently verified
copies of license conditions associated with creative commons images.
Whether you are a blogger, a PR agency, a freelance photographer or a
media production company, ImageStamper will give you peace of mind
when it comes to using creative commons images. "
I think we've kinda solved this problem now?
cheers,
Brianna
--
They've just been waiting in a mountain for the right moment:
http://modernthings.org/