Comment by Lammy
Yes, and even then only for Ultra HD Blu-ray. Regular BDs should still usually work unless they're uncommon enough to not have a title key known to MakeMKV.
“A LibreDrive is a mode of operation of an optical disc drive (DVD, Blu-ray or UHD) when the data on the disc are accessed directly, without any restrictions or transformations enforced by drive firmware. A LibreDrive would never refuse to read the data from the disc or declare itself ‘revoked’. LibreDrive compatible drive is required to read UHD discs.”
Thanks, good to know!