Disc with AACS version higher than officially supported

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smares
Posts: 31
Joined: Sat Mar 14, 2015 12:38 pm

Disc with AACS version higher than officially supported

Post by smares »

What happens when you try to rip a Blu-ray with an AACS version higher than officially supported? I have a copy of "When Marnie Was There" that is using AACS v60 and the latest version supported is AACS v58. The disc is ripping fine so far (~25% done).
Woodstock
Posts: 10312
Joined: Sun Jul 24, 2011 11:21 pm

Re: Disc with AACS version higher than officially supported

Post by Woodstock »

Read /svq/ for a start down the road to understanding. :)

The way AACS works is that the disc contains a revocation table that lists keys that have been identified as being "broken", and now not valid. After the drive reads the disk, those keys won't work for reading a BD. You don't even have to be running an application on the computer to have that happen. If your application still works after the disk is inserted, its key wasn't revoked.

If AACS v60 works with 1.9.9, then that means they haven't revoked the current MakeMKV key. However, I'm sure Mike would like a copy of the file involved. In your MakeMKV data directory, there should be a file with a name that starts with "MKB_v60" in that directory (set in Preferences->General). Send that file to svq@makemkv.com please.
smares
Posts: 31
Joined: Sat Mar 14, 2015 12:38 pm

Re: Disc with AACS version higher than officially supported

Post by smares »

Now this is awkward. The drive I use is an external Samsung BD writer. After ripping "When Marnie Was There" that clearly had AACS v60 (I event sent the respective file to the dev), I unplugged the drive and put it in the drawer. Now I plugged it in again to rip another disc I bought (the German "Honig im Kopf" with AACS v52) and the highest AACS version reported in the drive info is AACS v57. Shouldn't it be v60 since "When Marnie Was There" was v60? :shock:
Woodstock
Posts: 10312
Joined: Sun Jul 24, 2011 11:21 pm

Re: Disc with AACS version higher than officially supported

Post by Woodstock »

The "highest version" reported by MakeMKV appears to be from information it keeps, rather than being read from the drive. I'm not sure where or how it stores it, so it could have forgotten the v60 disk "happened" for that drive.

One of the things I hate about Windows and USB is that it can take the same device and give it a new internal device name, just because it appears on a different USB port. REALLY frustrating when dealing with serial devices, which could be "COM5" today, but "COM6" tomorrow.
smares
Posts: 31
Joined: Sat Mar 14, 2015 12:38 pm

Re: Disc with AACS version higher than officially supported

Post by smares »

Ah, that explains it then, I ripped the AACS v60 disk on my laptop and then I connected the drive to my PC. Thought the AACS version was read from the device.
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