Small Reminder... Copyright and Trademarks are not the same thing. In copyright law there's some fuzziness about derivative works, otherwise anybody could draw their own version of a black cartoon mouse with round ears. Trademarks mean that you can't call a cartoon mouse Mickey, even if it's dark grey with square ears. Things like company names, badges and logos are protected by trademarks, and if an infringement comes to a trademark owner's attention, he has to take action. If you ask in advance, he might give permission. I believe a few people do have trademark permission to make and give away certain 3D models. It can still be impractical to prove that permission to the satisfaction of a third-party hosting site. (This is getting to be a rather large reminder)