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How encryption for Cinema Movies works

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230 points perryflynn | 1 comments | 20 Apr 25 17:52 UTC | HN request time: 0.21s | source
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NoMoreNicksLeft ◴[21 Apr 25 14:10 UTC] No.43752208[source]▶
>Encrypted DCPs use Forensic Watermarks which contain the serial number of the projection system. So if a recorded copy of a movie appears online, the theatre will have to answer serious questions and may never get movies again.

Is this not as simple as dumping the same movie from two different projectors, diffing the output, then obfuscating the watermark?

replies(1): >>43754330 #
1. TheDcoder ◴[21 Apr 25 17:27 UTC] No.43754330[source]▶
To do that you need to figure out what parts are noise (watermark), simply diffing them would just give you a different noise pattern which can still be analyzed depending on how the watermark is encoded.