How to stop the zero day cams of movies?

I dunno if this would work across the board, but here is how I would short-term thwart people camcording movies in the theater. I’m not in the habit of bringing camcorders to the theater, so this is theory only, totally untested.

One of the challenges to the movie industry is people brining camcorders into the theaters, filiming the movie, then uploading to the internet.

My Sony camcorder is sensitive to Infrared light. This means, for example, that if I were to point a remote control at the camera and press a button, I can see the LED inside the remote light up. Could you, therefore, hook an array of bright infrared lights placed right behind pinholes in the screen, and tie the operation of the projector to the lights, such that the projector won’t work if the lights are not engaged. As long as the reels are turning. an array of these infrared lights would twinkle away pulsing randomly all over the screen. The in-theaters viewers would never see it, because our eyes are not sensitive to intrared. It could just play havoc with the camcorder version, though.

Are most camcorders sensitive to Infrared, or is that unique to Sony nightshot?