via paidContent.org:

There’s plenty to iron out, not least the complex rights issues of movies. While new media rights are becoming a staple for new content deals, archive content is fraught with complications. “It’s the library that’s difficult because the stakeholders are many, and in some cases there’s no single owner. There might be contingent stakeholders, a guild, foreign distributors with a stake in foreign markets – it’s very difficult to get a library cleared for a new distribution model. That’s something the studios are working on now that we can’t influence.”
Ashwin Navin Of BitTorrent