To play a Disc Bluray in PureOS you need a lib-decrypter so MakeMKV has a updated lib-decrypter to use it with GNU OSes. You need install makemkv from here:https://www.makemkv.com/forum/viewtopic.php?f=3&t=224 after install makemkv you can manager the bluray with the aplication makemkv.
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The exemptions I mentioned are more recent than the DMCA: https://www.copyright.gov/title37/201/37cfr201-40.html