Even with a correctly placed KEYDB.cfg , things can go wrong. Here are the most common pitfalls and how to solve them.
When MakeMKV encounters a protected disc, it checks this file to find a matching key. If a match is found, the software bypasses the encryption instantly. Why Does MakeMKV Need It? keydbcfg makemkv
In this example, the server enforces a two‑megabyte limit and evicts keys using an approximated LRU (least recently used) algorithm. Even with a correctly placed KEYDB
Essentially, keydbcfg is the source management tool , and MakeMKV is the execution tool . You cannot use one without understanding the other for 4K ripping. If a match is found, the software bypasses
Putting the file in C:\Program Files (x86)\MakeMKV will not work. It must go into the specific user data directory identified in MakeMKV's preferences panel. LibreDrive Firmware Requirements