Thanks for your answer and the examples you gave me. I didn't think it would be a problem for my picture but I thought it was better to check. And it's good to know that, in some cases, a simple render made with 3D resources can still be a problem. The rule of "50%" makes sense to me. But, do you mean that if I make a crowded scene with many characters, clothes, hair and objects, I have to check the license for every item ?