Login based torrents could work as a thought. However then you approach the issue of individuals bandwidth. I have restrictions on how much I can upload and download monthly. If I set a movie to download, and it is uploading at the same time, I'm not going to be pleased if I enter the overhead of my bandwidth and movies cost me more than the $8 a movie in bandwidth. There'd certainly need to be a lot of thought by someone more qualified than myself on the subject.