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Old 23rd October 2007, 15:09   #256  |  Link
FoxDisc
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Join Date: Jan 2007
Posts: 274
Quote:
Originally Posted by bcrabl View Post
Even if it cannot read everything now, I bet it can be made to read everything.
Everything on the disc that is needed can be read now. As KenD00 points out, actual bits in some areas can't be read, but that data can still be obtained after it's been read by the XBox drive.

Quote:
But do we know enough to make a virtual drive?
That depends on what you mean by "virtual drive." There are two ways that a disc gets decrypted and played - in standalone players and in PCs using 1) host software (like PowerDVD) and 2) a PC disc drive.

The XBox drive is a special case - its actually both of the above. When the XBox talks to it, it acts like a standalone using a player built into the drive firmware that sends decrypted video to be displayed by the XBox. When PowerDVD talks to it, it acts like a PC disc drive without a player and enters into an AACS authenticated session where both sides authenticate the other.

So back to your question. If you want a "virtual drive" that holds previously decrypted video - yes, that's easy.

I suspect however, you want the "virtual drive" to act like a PC disc drive that talks to a normal player like PowerDVD. For that to work, the host software (PowerDVD) and the drive would have to enter into an AACS authenticated session. Both the player and the drive need to be authenticated with their AACS signed certificates. The player is easy - PowerDVD has everything it needs - it's legal. The virtual drive would need a drive certificate, and AFAIK, no one has one. Even if they did, the AACS would just revoke it using the DRL (drive revocation list) on the next release.

As KenD00 says: "The only benefit of such a virtual drive would be if its easier to find a drive certificate than a processing key and maybe later sequence keys."

No one is going to disclose their work on drive certificates and the AACS authentication process until current decryption techniques begin to fail.
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