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Yeah, I don't like all this legal stuff.
Reasoning through examples: I have published some models made by me on this site published with the wording "Royalty Free No Ai License".
I naively thought that they were free to everyone and in every sense.
However, this is not the case.
So does a user who downloads this type of content have to pay? and who? obviously if they are used for commercial purposes.
cgtrader is quite ambiguous with their licensing of models that are free to download. According to their terms and conditions: "product which is offered as a free download shall be licensed with the applicable license as chosen by the Seller." I think that means that if you didn't specify otherwise, rules of standard royalty free (No AI) license should apply. You can find summary of this license here: https://www.cgtrader.com/pages/terms-and-conditions#royalty-free-license scroll down to paragraphs 20 and 21. To answer your later questions, no, users who download your free models don't have to pay anyone to use them and yes, they are allowed to use those models commercially, unless you've chosen custom license and it's not allowed by that license. Keep in mind that cgtrader's standard royalty free license is much more restrictive than most creative commons licenses, so if you want to make your models as "free" as possible, you may want to chose custom license option and chose on of the CC licenses for your models. I always release my free models under CC-BY-SA license, however i might change this in the near future, since CC licenses does not govern artwork usage by AI and i don't like this.
