Forrester warns that developments in digital video technology, like the DivX and XviD codecs, and developments in Peer-to-Peer technology like BitTorrent are set to fuel further movie downloading. The movies industry likely see's some of the problems in offering movie content to users, for example the sheer size of good quality downloads. A decent quality DivX download could be 700MB and would fit nicely on a CD-R. If they got millions of customers, they would require a massive amount of bandwidth and a huge system that would probably take a long time to piece together.
I think we all also know that there's probably no way that the movie industry would prove the potential of BitTorrent by using it to distribute movies legally. Technically it wouldn't be that hard to implement a system where you pay for a torrent file and access to a movie studio's tracker, but then they would be proving the one key factor that keeps programs like BitTorrent legal; that it has legitimate purposes.
Source:
Vnunetwork