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There's a difference though. DRM music files are sold directly to consumers. These consumers have to be able to decrypt the files on their own computers / devic
by 6nf 10y ago
There's a difference though. DRM music files are sold directly to consumers. These consumers have to be able to decrypt the files on their own computers / devices which makes DRM useless.
The movie files in this case are not meant for consumers. They're only decrypted on specialised equipment not accessible to the general public. If you manage to get your hands on a DCP file there's nothing you can do to decrypt it without access to the specific projector system it was intended for (unless someone screwed up somewhere of course)
- ultramancool 10y agoYeah, but let's be honest, if I had a job as a manager at a theater and a moderate amount of reverse engineering skill or a small team of friends with those, well, time, access and tools combine quite well... Sure, they make it look all secure, pass it through all that crypto and stuff but ultimately it has to be passed to the projector chip in some form which is unencumbered to be turned into light. At which point it's fairly trivial to dump. Anti-tampers on the case are probably fairly limited.
- hvidgaard 10y agoAccording to another comment here, the anti tamper mechanics on those projecters are not limited. They are in fact quite aggressive. If they have been any kind of smart when designing them, the decoded stream takes a limited, shielded, and highly tamper resistant path to the projector chip, and each and every critical component are paired with each other such that switching one of the out automatically destroy all keys.
- clarry 10y agoYou'd be taking a big risk once a watermarked release gets you. Perhaps you could blame it on a rogue employee and get away with it. Still, big risk.
- bryanlarsen 10y agoI'm under the impression that the last level of decryption is done in the projector chip itself. So while accessing the unencumbered stream is theoretically possible, it definitely requires a lot more than a moderate amount of reverse engineering skill and serious amounts of equipment.
- djsumdog 10y agoSo UHD BlueRays, they don't use DCP correct? But those haven't been broken as well (as far as we know), and that seems like the media to target to create 4k torrents. What tech is used on UHD consumer Bluerays?