Apparently, the RIAA doesn't feel like ISPs blocking piracy server-side is quite enough. The RIAA wants ISPS to begin implementing client-side filtering. This would work by forcing the end-user to install a program that monitors their every move, to ensure that nothing is illegal. It is very unlikely that such a move will actually come into play, because it is a massive violation of privacy and a huge breach of user rights. The RIAA feels that it would all be worth it, because it would let users that wouldn't otherwise know they're getting in a lot of trouble pirating stuff that they are, indeed, pirating.