Before LibreDrive, you needed to download a "Hashtable" or "KeyDB" file to decrypt a disc. After LibreDrive, MakeMKV could read the disc, extract the Media Key Block, and calculate the keys on the fly using a combination of known vulnerabilities and brute-force lookups.
The Cat-and-Mouse of Digital Preservation: A Deep Dive into MakeMKV, AACS, and the Hostile Decryption Landscape
Disclaimer: This article is for educational purposes. Always ensure you are complying with the copyright laws of your country when ripping media.