Oh, people can and do add this sort of stipulation (like no erotic use) to their readme files. I agree with you that they shouldn't. I agree that if they do, it can't be enforced. The point of my previous post was that "fair use" has nothing to do with it. Fair use, as I well know, consists of reproducing verbatim, text or pictures that are copyright, with acknowledgement of the source, but without permission of the copyright holder. This is permissable in reviews, for example, or in academic work. I know of one game fan site where the owner posted a lot of game screenshots. This would normally be of questionable legality, but he put very short game reviews on the same pages so that he could claim fair use. So, of my five-point EULA, you can certainly object to numbers 2-5, but you can't claim that they are inadmissable because they restrict fair use in the legal sense of the term, because they don't.