AACS Updated, Broken Again
We predicted in past posts that AACS, the encryption system intended to protect HD-DVD and Blu-ray movies, would suffer a gradual meltdown from its inability to respond quickly enough to attacks. Like most DRM, AACS depends on the secrecy of encryption keys built into hardware and software players.
Context & Ripple Effects
The AACS licensing body has issued an updated version of its HD-DVD and Blu-ray encryption system after the previous revision was defeated a week before its own release (defeated a week before release), following the December 2006 BackupHDDVD tool crack. The update-and-break cycle was predicted in advance by Freedom to Tinker analysts, who argue that any scheme built on secret keys embedded in hardware players will suffer a gradual meltdown because each leaked key can only be patched by revoking it.
The stakes sit inside the unresolved next-gen DVD war between the Blu-ray and HD-DVD camps, which has been running through CES lineups and studio title commitments since late 2005. Consumer attention on DRM failures also spilled into mainstream platforms earlier this month, when Digg's handling of HD-DVD key stories became a story of its own (Digg's HD-DVD moderation controversy) — evidence that the cracks had moved from specialist forums to public debate.
First-order effects
- AACS LA must revoke compromised player keys and push new ones, meaning legitimate buyers of early HD-DVD and Blu-ray players face the prospect that their devices stop playing future discs once their keys are blacklisted.
Second-order effects
- Studios shipping high-profile Blu-ray and HD-DVD titles must weigh whether the protection still justifies premium disc pricing, while each revocation cycle raises the support cost of the format for both camps in a race where consumer trust is the differentiator.
Third-order effects
- If the pattern holds, secret-key DRM proves to be a treadmill rather than a barrier — pushing content owners toward either abandoning per-player secrecy or accepting that enforcement shifts from technical locks toward legal and business-model responses.
The trend: Next-generation optical media is exposing a structural weakness in DRM built on embedded secret keys: every fix buys time but guarantees another break, turning copy protection into a recurring cost of doing business for the entire disc ecosystem.