Comment Re:Same reason blu-ray didn't take off (Score 1) 204
It stops some people. Not everybody wants or bothers to torrent movies, and TPB only reliably carries Big/Popular/New movies, they don't really keep a deep library or long tail -- you can find just about any title in existence but the seeders off the main drag are a flaky breed. BluRay DRM seems to be working pretty well if you're trying to make sure people pay for a copy of Cat Ballou or Brigadoon, particularly if the alternative of Hulu or Netflix is a click away.
Also, if they didn't use DRM, then you could rip a DVD without violating the non-cricumvention provisions of the DMCA, and the rights-holders would rather have that against a pirate than not, it gives them more legal options.
As always, the people who buy stuff aren't the targets as much as the aggregator entities like TPB and MegaUpload, who make millions selling ads and subscriptions on "free" downloads.
That's really all DRM is good for on DVDs and Blu-rays. It works better when it's one part of an entire media framework or system -- like Apple/iOS, where it's a mobile device with a locked-down app environment the user can't really get into casually; or the Digital Cinema distribution system, where media is protected with DRM and transported over secure channels, and all the equipment is kept behind locked doors with limited access, and the projection equipment itself is electronically interlocked to keep people from tapping it.