Could these IR-LEDs be effective for movie theaters to prevent pirate cammers from creating viable recordings? Seems like it'd be pretty easy to implement if the studios really felt threatened by piracy.
I've never tried in a movie theater :p but have noticed this effect by pointing my phone camera at an IR television remote and pressing some buttons. The IR LED lights up and is only visible to the camera and not the naked eye.
Anyhow, I'm more just curious why studios / cinemas don't take relatively simple measures like this to prevent pirate recordings from being created. Perhaps the IR would be too easy to circumvent via a physical lens filter.