I've produced a short (~15s) video intro/title for a local sporting event being covered by a media firm. This work has been done for free, as I support the cause.<p>However, I want to ensure that I license the rendered assets to them in a way which ensures that they cannot use them again in future for an unrelated event without requiring relicensing for a fee.<p>I've looked around, and cannot find any boilerplate single-use license templates. Any advice?