I was recently contacted by a company who wants to use one of my animations as part of a documentary. We've agreed on a price but they also want something (a document I assume) which acts as a "proof of license" for them to be able to use it commercially. Since I haven't sold directly to somebody like this before this is a first for me, and I don't exactly know how to go about it.
I don't really know what the contents of the license should look like. Should it simply say that I'm giving their party the ability to use the clip commercially for project X and that's it? Just include that single statement in an PDF with my name signed? I just don't know what it should look like. Has anybody else had to do this themselves? Can you give an example of what this may look like?