AACS MKB updates to drives

[Firefall]

Hi! I have a question concerning AACS MKB updates. I used to have 2 internal BD drives in my PC. I've ripped various Blu-rays with them. MakeMKV told me that the "Highest AACS version" was 77 for both of them. I was deliberately waiting to rip a more recent disc to avoid updating the AACS version of my drives. I then bought an external drive, connected it to the same PC, and inserted one such disc to validate its MKB version. It ended up being MKBv81. Next thing I know, MakeMKV is now telling me that all three drives' "Highest AACS version" is now 81, even though that disc was only in the external drive.

- Why did this happen? Do the drives spread MKBs amongst them?
- Do I risk updating all my drives' MKB whenever I connect a drive with a newer MKB to the same PC?

All of this happened under Windows 10 Pro in case it matters. I guess I'm still OK with v81, but AFAIK the current public device keys and certificates are invalidated in v82, so I'm hesitant to touch more recent discs at this point.

[spotter]

I'd hazard to say its just an makemkv thing, not a drive thing. MakeMKV caches the highest mkb it has processed and show that for all drives.

[lamp]

I have seen this behavior as well, as mentioned above I believe it is just a MakeMKV thing, only 1 of my drives was "poisoned" with the newer MKB version and all the rest still work correctly, even though MakeMKV says they are all MKB v82

[Dennis98]

I noticed the same in October when I connected a second drive and was surprised it apparently had the same "AACS"/MKB version.
But I already thought it might not actually be the case and MakeMKV just had that cached for example.
Today I got curious and checked the registry for that value and it's not there, but I found this thread:
https://forum.makemkv.com/forum/viewtopic.php?t=18908

So basically MakeMKV stores it in its data directory when it encounters a higher MKB than it has seen before. I can confirm I see a file matching the shown version on my machine. And this is not per drive.

[john22]

Once a higher MKB is successfully processed on a PC, MakeMKV will report that higher version for all drives on that system, even if those drives never saw the disc.