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That actually happens: Screenings have been interrupted because the internet connection to the projector gets cut. :-/
by wtracy 14y ago
That actually happens: Screenings have been interrupted because the internet connection to the projector gets cut. :-/
- __david__ 14y agoThat makes no sense. The KDM is a self contained public-key encrypted message containing the decryption keys. It requires no internet connection to verify and extract the keys, and it certainly doesn't need to do it during the movie. In fact, most projectors are not even connected directly to the internet.
- xentronium 14y agoHow do you make sure that system date was not tampered with then?
- __david__ 14y agoI cant remember how that works but I suspect the RTC is in the FIPS can and that it takes effort to set it. They wouldn't go to all that effort to put times in the KDM if someone could just bypass it by setting the system date. It's a pretty well thought out system.
- Thlom 14y agoCorrect. The DCI says the secure clock only can be adjusted 6 min per year, 20-30 min with a code/package from the manufactorer. If it's adjusted over this limit the mediablock will have to be changed.