The issue with blu-ray is (and will likely always be) the decryption keys, which are copyrighted and cannot be distributed legally.

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wmf 3 hours ago | parent [-]

Encryption keys, being purely random, are not copyrightable. (In light of recent events, this raises the question of artisanal human-created keys.) Distributing keys probably violates DMCA section 1201 though.

	▲	dijit 2 hours ago \| parent \| next [-]
		BD+ and AACS are literally that though, that’s why VLC can’t play blu-rays. > NB: Most commercial Blu-Ray are protected by AACS or BD+ technologies and this library is not enough to playback those discs. https://www.videolan.org/developers/libbluray.html clicking into the libaacs and libbd+ yields: > NB: this project doesn't offer any key or certificate that could be used to decode encrypted copyrighted material.
	▲	Retr0id 3 hours ago \| parent \| prev [-]
		Spotify's offline playback DRM hinges on a HMAC key that's a human-readable phrase, based on a certain lyric. I'm curious whether it's just a fun easter egg, or if there's some kind of legal basis for the choice. See also https://theapplewiki.com/wiki/Dont_Steal_Mac_OS.kext