Of note is that there is apparently one single application licensed to play Blu-Ray disks on PCs, CyberLink PowerDVD. Anyone watching Blu-Rays through alternate means on general-purpose computers today, by using MakeMKV or similar, are likely breaking anti-circumvention laws.

As of November 2023, zero applications are licensed and capable of playing UHD Blu-Ray disks [0], and PC manufacturers are just not including the hardware necessary to do so.

0: https://www.cyberlink.com/support-center/faq/content?id=2834...