As Geist mentions, digital rights management is dying a slow death.I personally know a number of people involved in DRM, both in implementing rights management technologies, and in defeating them. I recently heard one of these people lament that it's said that it's going away because it was such a fascinating field of research: like few security tech areas, the two sides were evenly matched.
This Internet locks thing...
The first -- and biggest -- problem is government. In the United States we have the "notice-and-takedown" provision of the DMCA, which compels ISPs to take down hosted content if they receive a complaint about a copyright violation. This is a terrible rule given its extra-judicial nature and potential for abuse, and it might be coming to Canada (though there's some room for hope after popular protest convinced Jim Prentice to not introduce his Canadian DMCA in December).
When you have government legislating on behalf of content owners, the game is lost.
The AT&T thing is a new twist, and honestly I have a lot of trouble understanding it. I am troubled by this: what is AT&T's motive in suppressing customer activity? Without legislation forcing it to do this, why would it incur the expense to police its own network on behalf of other corporations?
Geist hasn't tried to answer this, and as far as I have seen, neither has anyone else in public discussion.