My 2 cents on the topic is this -- If you don't want people to use your model, and tweak your model slightly, then don't post it on the INTERNET :| Keep it on your PC, and your PC only... I know it seems a tad harsh and insensitive, but really.. come on... You're sharing something with the whole world and then telling people "oh, but you can't touch it at all.." and also, let's face it, if someone is editing the original model that you posted, and then re-uploading THEIR edited version of it, then it would be unfair to say that you made the whole thing..