It depends also what you mean with copy. The code has copyright but the rendered pixels don’t (other than if something like an image was created pixel by pixel). So if the code is different but the output looks the same it’s not copyright infringement (can still be trademark).

I think that’s dependent on jurisdiction. This comes up with fonts where what you said applies in the US but in Europe, the actual visual result of the software also counts and is protected (afaik).