DVD and CD are completely documented formats, the DRM has been cracked, and the patents are expired. Blu-ray patents are about to expire.

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dijit a day ago | parent [-]

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 a day 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.

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dijit a day 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.

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pseudalopex 12 hours ago | parent [-]

Key or certificate could be used to decode encrypted copyrighted material and key or certificate is copyrighted are different.

	▲	dijit 12 hours ago \| parent [-]
		I don’t know how to say this softly. Answering in this way has done nothing to further my understanding of the topic, you haven’t explained the difference or why there is a difference and you haven’t offered a counter-example. I can only surmise that you’ve answered in order to feel superior, but that doesn’t make sense because while I have examples of behaviour that can be explained by my statements, you haven’t added anything to explain yours. So, your statement stands alone, undefended and without context or explanation. What were you trying to achieve? A key that is used to decrypt copyrighted material being /itself/ copyrighted means it cant be distributed which is what we see.

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Retr0id a day 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.