DVD anti-copying measures [LWN.net]

DVD anti-copying measures

Posted Nov 15, 2020 4:41 UTC (Sun) by giraffedata (guest, #1954)
In reply to: Copyright law by nybble41
Parent article: The RIAA, GitHub, and youtube-dl

So that's what prevents making a physical copy, but what prevents you from making a usable copy of the content on a flash drive or whatever is the encryption. That's the technological measure you have to circumvent to make that kind of copy.

If the encryption just stopped you from playing the DVD, I don't think DMCA would have much to say about it.

What takes most people by surprise about DMCA is that if you circumvent the encryption just to play the DVD, not to copy it, you're still in violation of the DMCA, because you are circumventing a technological measure that also prevents copying.

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DVD anti-copying measures

Posted Nov 15, 2020 6:12 UTC (Sun) by nybble41 (subscriber, #55106) [Link] (2 responses)

> …what prevents you from making a usable copy of the content on a flash drive or whatever is the encryption.

The encryption doesn't prevent you from making a copy of the (still encrypted) content of the DVD on a flash drive. It only prevents you from playing the video from that copy, since it would need to be decrypted first. The only official, licensed systems that can decrypt the DVD content for playback will not accept encrypted input from a flash drive, only from commercial DVDs, so having a bit-for-bit copy of an encrypted DVD on a flash drive doesn't help. Still, CSS would be more accurately classified as protection against unauthorized *playback* rather than unauthorized *copying*.

DVD anti-copying measures

Posted Nov 15, 2020 17:45 UTC (Sun) by giraffedata (guest, #1954) [Link] (1 responses)

I think I could make a case that the content protected by copyright is the movie, not the bits. A copy of encrypted bits that can't be played is not a copy of a movie, so encryption is a device that prevents copying.

Sometimes engineers, with their view inside the machine, have a rather different perspective on copyright law than authors and copiers.

DVD anti-copying measures

Posted Nov 15, 2020 18:25 UTC (Sun) by geert (subscriber, #98403) [Link]

So my dm-crypted hard drive does not contain any movies, as the RIA* cannot play them?
Well played ;-)