A series of posts by Ed Felton regarding the changing arguments for and against DRM.

First, they argue that DRM enables price discrimination — business models that charge different customers different prices for a product — and that price discrimination benefits society, at least sometimes. Second, they argue that DRM helps platform developers lock in their customers, as Apple has done with its iPod/iTunes products, and that lock-in increases the incentive to develop platforms.

And as evidence of this, there’s an interview with a Universal Pictures spokeman about HD-DVD and Blu-Ray that mentions DRM.

DRMs enable business models, they don't stop piracy. And we want to make sure that we have a rich one without making it so easy so that you can violate what we agreed on when you purchased a movie.