Actually, yeah. Apparently the kind of lockout the replacement firmware works around has been defined for BD from the beginning but has only really been enforced for UHD BD.

Most newer drives won't give you the kind of direct access you need for an accurate copy. Some disc areas necessary for dealing with copy protection are inaccessible except by specially blessed playback software.

Some older drives ignore this restriction but newer ones, especially all 4K-capable drives, don't.

There's an alternative firmware called LibreDrive that enables a low-level access mode where an application has direct control over the laser assembly. That plus ripping software aware of this mode (MakeMKV) will get the data off the disc. Add known decryption keys and you can get at the raw video files.