> One of the ideas they have is that if someone manages to break
> the encryption for say Batman Begins or whatever, and uses Memorex
> HD or BluRay media, they can put out an update on the next disc
> that gets released that invalidates that media for all the drives.
> Hence, anything you have on Memorex, for example, will no longer play.

What are you talking about ? What would prevent people from buying
another brand of blank discs ? And how do you think your update would
prevent old discs to play ? What is revoked in AACS are the devices,
not the media. For instance, if encryption is broken on a particular
player, it will be revoked and will refuse to play all future movies
(but will still play old ones).