RE: Changing the hash
"... and so does the usefulness of the Bittorrent protocol. Instead of downloading the same movie from 1000 other people at once, users have to choose which variant to download, each one of which only 10 other peers have."
not so, what he means is that the hash that this database will be looking for will no longer exist, so the torrent will be there, with the movie file intact ready to be downloaded but will avoid the deletion by this method by appearing to be a totally different torrent. You will only download the new torrent, as the original will have been deleted.
I can't see this really being a good use of money by anyone, the MPAA shoudl just give up and admit that their industry is overpriced and entertainment should not be the source of criminal activity, why don't they conecntrate on something important like the millions of people worldwide who don't have enough to eat. Who cares if some fat cat allegedly 'lost' millions because nobody bought a film - the film was probably crap anyway.