In simple terms (ok, not that simple), muslix64 does not claim to have cracked the AACS DRM itself, but instead to expose and use each disc's hard-coded private key in order to make the hardware device run through its routine decryption process. By doing so, BackupHDDVD effectively bypasses the key revocation system which might otherwise prevent it (or your HD DVD hardware, like an Xbox 360 HD DVD drive) from being mass-invalidated as soon as the RIAA blinks. The trick here, however, is the private key extraction -- no one really knows how muslix64 exposed and extracted the private keys on the HD DVD discs needed to strip the DRM from the HD DVD discs. S/he claims it can be done with any poorly built software or hardware as the private disc keys are held in memory, but we still don't have specifics. So while we're sure to see master key lists for HD DVDs popping up on file networks in the near future, we're still hazy about how a regular user can extract his or her own keys for their own fair use purposes. We'll be sure to keep you up to date on this, though, as more information becomes available.