Blackhearted that is a pretty standard term of use, I believe it is 'rosity's. The 3-D Arena one is very similar. I can also tell you that if a vendor at 3-D Arena used those tactics, we would no longer carry their items. Artists have the right to impose their own terms of use on anything they create. They do not have teh right to change their terms in regards to past transactions against those who purchased items and acted in good faith. Consumers have a right to refuse to purchase any item that has an excessively restrictive term of use. For a 3D artist to be required to credit everytime an item is used, that isn't feasible, nor does it appear professional. When I was heavily into photography, I didn't credit the camera company, film company, developer, model and such in my portfolio images. A Portfolio (and imho that means gallery work) is to see what a person can do with the tools they have. I don't care where you got the model, but rather what you can do with it. Unless of course I want th model, then I just ask.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo