Permission culture is a term often employed by Lawrence Lessig and other copyright activists such as Luis Villa[1] and Nina Paley[2] to describe a society in which copyright restrictions are pervasive and enforced to the extent that any and all uses of copyrighted works need to be explicitly leased. This has both economic and social implications: in such a society, copyright holders could require payment for each use of a work and, perhaps more importantly, permission to make any sort of derivative work.