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You can't create a derivative work using the rendering. But doing so would violate the diagram system's own rules about not using other people's work in your diagrams. If it was illegal, I expect someone would have spoken up about it and there would be some sort of notice, but I don't know of any such thing. Taking pictures of buildings or public art installations, while they are copyrighted, is perfectly legal and when you take that picture you own it entirely. I would think that drawing a diagram of building based on a rendering would be similar.