Why not meerly act as a middleman, and not impose Royalty or Royalty Free preconditions at all. The whole area is a minefield e.g. what is the exact (100 page closely typed legal description) of Royalty Free (if such a document exists at all or exists perhaps as the published but uncompiled summary of various court findings i.e. in case law), does it cover every possible usage? are there exceptions? I think Renderosity would be better off staying out of that minefield where specialist lawyers make big bucks. If you enter into the process by stipulating licencing terms, you may end up entering into any potential future legal row. Leave it between vendor and purchaser, maybe provide examples to vendors of standard type licence agreements, but my advice is to stay out of the actual agreement and imposing terms on what kind of licence agreement should exist. If buyers do not like a licence agreement they will not buy by the same token you cannot ever be accused of imposing a range of licencing terms on vendors. That way you will not be dragged in if a row starts. This is even more simple. STORM