When AACS was revealed as the encryption format of choice for HD DVD and Blu-ray, bets were placed on how long it would take for it to be cracked. Since the first HD DVD and Blu-ray discs began shipping, hackers have been hard at work figuring out how to break the encryption; DVD Jon even registered DeAACS.com. We've covered both crackers' efforts and the attempts by the AACS Licensing Authority to keep those cracks from seeping into the public consciousness. Yesterday, all of that came to a head.

A submission on Digg which contained the recently uncovered encryption key for HD DVD discs was removed yesterday by the site's admins after the site was served with a DMCA takedown notice, according to Digg CEO Jay Adelson. Such takedown notices are not uncommon. The AACS LA has issued them far and wide in an attempt to give the crack as low a profile as possible—Boing Boing blogger Cory Doctorow was the recent recipient of just such a notice after students of a class on copyright he was teaching at the University of Southern California posted the key and a link to the infamous Doom9 forum where AACS cracks have been openly discussed.

The futility of the AACS' actions was demonstrated last night when Digg was hit with a barrage of submissions containing the forbidden key. For a few hours, Digg's front page consisted of little more than a succession of links to the hexadecimal HD DVD key. After several hours, Digg cofounder Kevin Rose said that the site had received the message loud and clear, pledging that Digg would no longer kill stories and comments containing the key.

While the shenanigans at Digg were fascinating to watch as they unfolded, in the grand scheme of DRM it serves mostly as a reminder that the Internet holds no secrets. Like it or not for the AACS LA, DVD Forum (which backs HD DVD), and the Blu-ray Disc Association, Pandora's Box is opened wide. Not only is the key out in the open, but perhaps more damagingly to the HD lobby, public awareness of DRM and its cracks has been raised.

How will HD DVD, Blu-ray, and AACS LA respond? We don't know, and chances are that they don't either. Last night and this morning, Ars contacted all of them, along with the MPAA, to ask that very question. We haven't had a single phone call or e-mail returned from any of them.

We're nearing the point of ready availability of tools like DeCSS for HD DVD and Blu-ray, but Blu-ray has a couple of extra layers of protection (ROM Mark and BD+) that have yet to be deployed. Also, both HD formats have an antipiracy weapon in their arsenal that DVD lacks: the ability to revoke device keys, which has already happened to Corel's WinDVD. Unfortunately for both HD DVD and Blu-ray, that looks like it's going to be as effective as a suit of chain mail against a bazooka shell; Doom9 forum member arnezami claims that the hack at the center of the latest maelstrom is irrevocable. Even if arnezami is wrong in his evaluation, the AACS LA's vigilance in trying to keep the existence of HD DVD cracks out of the public eye has backfired in a truly spectacular manner.