When a Blu-ray or UHD disc is manufactured, it is encrypted with a specific . Think of this as the master key to a specific movie title (e.g., "The Batman 2022"). Your Blu-ray player has a licensed decryption module; MakeMKV does not—it reverse-engineers the process.
MakeMKV can automatically download new keys if it can connect to its central server. makemkv volume key is unknown
The most reliable way to fix this is to provide MakeMKV with a KEYDB.cfg file. This file acts as a community-sourced dictionary of keys. When a Blu-ray or UHD disc is manufactured,