MakeMKV provides the engine (ripping and remuxing), while the community-driven KEYDB project (managed via keydbcfg ) provides the fuel (the decryption keys). Without the configuration, you cannot unlock newer discs; without MakeMKV, you cannot create the MKV file.
The keydb.cfg file is a community-maintained database used by MakeMKV and other media software to decrypt Blu-ray and 4K UHD discs. While MakeMKV primarily uses its own "hashed keys" system that updates automatically, the keydb.cfg file acts as a vital secondary source for decryption keys—especially for new releases or when MakeMKV's internal servers are inaccessible. What is KeyDB.cfg? keydbcfg makemkv
If managing keydbcfg feels too technical, consider these alternatives: MakeMKV provides the engine (ripping and remuxing), while