The MPAA is looking to block PVR users from recording movies that are broadcast but net yet released on DVD. They want to release movies on a pay-per-view basis before they're available on DVD, but they'll only make these movies available if they're allowed to block PVRs from recording them. With C61, the restirctions would also be in place in Canada as well.
http://arstechnica.com/news.ars/post...me-movies.html