Now that we understand the "why," we can address the "how." Here are the steps to resolve the issue, ordered from easiest to most advanced.
For 90% of users, simply or installing the hashedkeys.txt file will solve the problem instantly. For the remaining 10% (usually owners of brand-new 4K discs), you must either wait for the community to catch up or dump the key yourself. makemkv volume key is unknown
release. This often happens with brand-new releases or different regional versions of the same show. Immediate Fixes Check Internet Connection Now that we understand the "why," we can address the "how
To understand the fix, you must first understand the lock. release
When you insert a disc into a drive, the data on the disc is encrypted. To read the video content, the software must decrypt it. This decryption process relies on a specific key for that specific disc—this is the "Volume Key."
When a new movie is released, studios may utilize a newer version of the AACS protection scheme. If MakeMKV has not been updated to handle this new version of the encryption, it will not know how to calculate or retrieve the Volume Key. This is why MakeMKV updates are so frequent—often, the developer is playing catch-up with the latest encryption tweaks from Hollywood.