Folks, Ive said this countless times before. If you want to prove your copyright on something, put it on a disk, get a printout, and put the whole mess in an envelope that you send to yourself by registered mail and then do not open the envelope. The biggest issues in copyright is the date of creation, and that becomes even more fragile with computers, since the computers clock can be reset to any date you want to make the file creation date any you wish. But if youve sent it by registered mail, the government provides you automatically with the date protection, and as long as it remains sealed, you have your proof. Copyright is much like divorce when it comes to attorneys; "lets make it as confusing and obtuse as possible so no one but us will be able to handle it". In its most essential, copyright is not that difficult if you want to prove your work is indeed yours and that someone elses is a derivation of it. Anyone can look at the textures above and see, without a doubt, that one is based on the other (and pretty freely taken at that). The only question that would be left is, Did he indeed know it was copyright material, and thats an entirely different issue altogther.