From your description, it's hard to tell if you're saying that your modified obj would be distributed. If so, that means "new users" could buy the product and use without owning the original and that goes against the licensing. If that is what you meant, you need to contact RPublishing to see about working out distribution arrangements with them (rpublishing@renderosity.com).

IF that isn't what you mean, then can you explain in more detail exactly how your files work?

Best Regards, Jenifer Carey Renderosity Copyright & Licensing Agent