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Foiling Cinema Pirates
minesweeper writes "According to this Associated Press article, in fighting the piracy of advanced-screenings of movies, Hollywood has deployed agents with night vision goggles and placed metal-detectors at theater entrances. Nevertheless, video cameras are still being smuggled in and the recordings smuggled out and onto the Internet. Now, the latest attempt to fight piracy will be to show the movie with a particular flicker, imperceptible to the viewer in the theater, but making any video recording unwatchable. Quoth the article, 'Cinea LLC, which created an encryption system for DVDs, and Sarnoff, a technology research firm, are developing a system to modulate the light cast on a movie screen to create a flicker or other patterns that would be picked up by recording devices...'"
I think you got screeners and cams confused. Cam copies are poor quality recordings of the cinema screen using a hidden camera.
Screeners - which you mentioned are copies from media (usually DVD) sent to rental stores, etc well in advance before a film starts showing. They have perfect quality, and dont differe much from the final DVD excapt that they may lack some extra/bonus features.
With people out there who say they can hear the difference between a CD and an MP3, I wonder if people won't complain about this, even if they can't see it.
If you get a camcorder and record a regular CRT and play it back, you'll see all sorts of crazy flickering on the recording. That's because the screen only updates X times per second, and that doesn't always correlate up with how often the camcorder takes a shot.
Generally, people can use a CRT without seeing this flickering. Although if you use a lower refresh rate, most people get headaches, and some will notice flickering or just sense something is 'wrong'.
At the right refresh rate, you could recreate this effect while annoying only perhaps 0.5% of your audience, and if it's just for a few preview screenings, it might be a good idea for them.
Actually they use a genlock to get the TVs and monitors to match the scan rate of the film camera.
The reason Apple Macs used to be seen so much in films is simply that Macs have always had a genlockable video output (along with Amigas), whereas PCs require more work to genlock.