That might work for static videos and music where the thing isn't interactive, but I don't think it maps cleanly to things like games with an online component, or "we won't sell your private data" SaaS promises.

For example, imagine an MMO, where the buyer says: "I want the trademark and the copyright to all textures and 3D models, but I am not buying the copyright to the source code because I'm going to make a sequel."