This is where comes into play.
AACS (Advanced Access Content System) is the encryption used on Blu-ray and UHD Blu-ray discs. Every commercial disc contains a specific set of cryptographic keys. When MakeMKV fails to open a disc, it usually throws an error about "Volume Key" not being found. keydbcfg makemkv
However, a historic exemption granted by the U.S. Copyright Office allows the circumvention of DRM on Blu-ray discs specifically for the purpose of creating fair-use backups, educational use, or accessibility (commentary) . This is where comes into play