I think it depends on the sales agreement... I think u can sell an object for non commercial use.

It might be that the renderosity marketplace has a rule for this of it's own. if not it's up to the person selling his model to do that. I for one would rather not have someone pay $5 for my model, slap another texture on it, hit the render button and earn 20 times as much for the end result as he paid me for the model...

To be honest i dont remember if i adressed this issue with my own marketplace products, but i dont consider them of much commercial value anyways. (which is why they're friggen cheap)

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