I really find that hard to believe. Do you seriously mean that every time a newspaper wants to publish a photo of downtown Stockholm, they have to pursue everyone that got in the shot and ask their permission? Come on! And what about all those magazines that make a practice of snapping celebrities through telephoto lenses? Do you suppose the subjects give written permission for THAT? The principle is or was or should be that copyright infringement occurs when the original can be reconstructed from the copy. Thus if I write a poem, and you photocopy the poem and put it in your render, you breach my copyright because the original poem can be reconstructed. However, there's no way to reconstruct the .vue file from a .jpg. (Or a person or a building from a photo.) This has implications for things like Poser textures. If I take a commercial skin texture from the RMP, apply it to a plane and render, I infringe copyright because the original file can be reconstructed more or less from a render on a plane. But if I apply the texture to Vicky as intended and then render, that's OK because you can't unwrap the original texture file from the human model.