A group here in Rochester is organizing a "TEDx" conference. If you don't know, TED is an annual conference dealing with cutting-edge thinkers in Technology, Entertainment, and Design. "TEDx" are local conferences independent of the actual TED organization, but held for the same purpose.
Anyway, a person from the group saw an image of mine on my Flickr page and contacted me about using it for the conference on the program and invites, as well as a running slideshow of my images between presenters. He estimates about 560 people will attend.
The "TEDx" conferences are nonprofit affairs, in fact a rule for hosting one of these is that they can't make money. Everything must be donated or provided by a sponsor. Because of this, they have no funds to pay for the images.
I have no issue about letting them use my images in exchange for a special thanks in the program, my question is how do I write up a license agreement for this? How do I reference the images specifically and what they can be used for?
Long post, I know. Any help would be greatly appreciated.