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Looks like DRM prevented to watch movies in many theaters yesterday
(www.theverge.com)
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this post was submitted on 02 Jan 2024
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It's been over 10 years since I worked in a movie theater but this is the gist:
Hard Drives with the film are derived via FedEx and the films are encrypted with symmetric AES keys which are emailed to our theater. These keys allow us to play back the film for a window of time. Sometimes we're sent keys to unlock different times if a film gets an extended release.
Some studios (Disney being the worst) would send you keys late into the evening, requiring staff to stay late to test for the following day. Sometimes they'd send us the wrong keys and it would take a long time to get the correct keys emailed to us.