Thoughts and questions on Volume ID patches.

Zombiedeth · 10th May 2012, 02:29

Seeing as some new drives can use the Volume ID patches more people will still be able to use aacskeys even when the host certificate is revoked. But what else?

VideoLan and other players could also benefit if libaacs used the AACSBYPASS code from aacskeys.

The one concern i have though will the industry start revoking bluray drives that have patches available?

If i understand correctly during the aacs authentication process player and drive hand over there certificate. If the drive receives a revoked host cert the process ends you don't get the VID. But in the case of the player say powerdvd when it receives a revoked drive certificate. From what i've read it tells you to update your firmware or something to that effect.

Now there seem to be some murky elements here if the drive is revoked would VideoLan still be able to play blurays or would the drive be toast until a new firmware was released?

ro-ee · 14th May 2012, 15:27

It was my understanding, that the drive would continue working, but once a certain host certificate is revoked (the infos about revoked certificates are written on new Blu-ray Discs), this old certificate won't be accepted by the drive anymore. So you cannot playback old discs (unless you have stored the Volume ID elsewhere). A newer host certificate should be enough to perform again the authentication. Just as you can imagine Software A (e.g. WinDVD) uses an old host certificate. Then this HC gets revoked, and Software A cannot playback anymore on that drive. Software B (e.g. PowerDVD) has a different host certificate, and should play back BDs with the same drive just as before. And a software A' (e.g. a newer version of WinDVD with a new cert) should also be able to play again.

My thoughts about this could still be erroneous, as I didn't have a revoked certificate yet to test this theory.

10th May 2012, 02:29	#1 \| Link
Zombiedeth Registered User Join Date: Apr 2012 Posts: 15	Thoughts and questions on Volume ID patches. Seeing as some new drives can use the Volume ID patches more people will still be able to use aacskeys even when the host certificate is revoked. But what else? VideoLan and other players could also benefit if libaacs used the AACSBYPASS code from aacskeys. The one concern i have though will the industry start revoking bluray drives that have patches available? If i understand correctly during the aacs authentication process player and drive hand over there certificate. If the drive receives a revoked host cert the process ends you don't get the VID. But in the case of the player say powerdvd when it receives a revoked drive certificate. From what i've read it tells you to update your firmware or something to that effect. Now there seem to be some murky elements here if the drive is revoked would VideoLan still be able to play blurays or would the drive be toast until a new firmware was released?

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14th May 2012, 15:27	#2 \| Link
ro-ee Registered User Join Date: Aug 2010 Posts: 34	It was my understanding, that the drive would continue working, but once a certain host certificate is revoked (the infos about revoked certificates are written on new Blu-ray Discs), this old certificate won't be accepted by the drive anymore. So you cannot playback old discs (unless you have stored the Volume ID elsewhere). A newer host certificate should be enough to perform again the authentication. Just as you can imagine Software A (e.g. WinDVD) uses an old host certificate. Then this HC gets revoked, and Software A cannot playback anymore on that drive. Software B (e.g. PowerDVD) has a different host certificate, and should play back BDs with the same drive just as before. And a software A' (e.g. a newer version of WinDVD with a new cert) should also be able to play again. My thoughts about this could still be erroneous, as I didn't have a revoked certificate yet to test this theory.