The purpose of DRM is not to prevent copyright violations.
The purpose of DRM is to give content providers leverage against creators of playback devices.
Arguing that DRM doesn’t work is, it turns out, missing the point. DRM is working really well in the video and book space. … Had CDs been encrypted, iPods would not have been able to read their content, because the content providers would have been able to use their DRM contracts as leverage to prevent it.
DRM’s purpose is to give content providers control over software and hardware providers, and it is satisfying that purpose well.
As a corollary to this, look at the companies who are pushing for DRM. Of the ones who would have to implement the DRM, they are all companies over which the content providers already, without DRM, have leverage: the companies that both license content from the content providers and create software or hardware players. Because they license content, the content providers already have leverage against them: they can essentially require them to be pro-DRM if they want the content. The people against the DRM are the users, and the player creators who don’t license content. In other words, the people over whom the content producers have no leverage.
Source: Ian Hickson – Google+