Instead they install cameras behind the screen to try to detect camera lenses :) https://torrentfreak.com/movie-spy-cameras-attack-the-dying-art-of-camcorder-p

Instead they install cameras behind the screen to try to detect camera lenses :) https://torrentfreak.com/movie-spy-cameras-attack-the-dying-art-of-camcorder-piracy-120426/ https://torrentfreak.com/movie-spy-cameras-attack-the-dying-... They also apparently use the data to gauge emotional response to movie scenes!