By definition, when I buy a royalty-free model, I don't have to pay royalties each use. But I have a question about the usage of the model I purchase. Am I allowed to use the model publically, on Instagram or YouTube for example, and not provide credits to the creator? I just want to make sure I don't break any technical rules or void my license. Keep in mind that I am paying for the models, and they will all be licensed as royalty-free. If you guys can help me figure this out, that would be AMAZING!