My local cinema has a large (about a metre wide, and 30 cm tall) bar of what look like IR LED's directly above the screen, angled to face the audience. I've never been able to check if they ARE what they look like, due to the obvious issues with getting out a camera to check while sitting in the cinema.
They have been around for a few years though, at the very least. As long as I can remember going to the cinema there. Perhaps they are a bit ahead on ruining the attempts of pirates to film their films. They even had a big message all over the posters for the new bond film warning people off attempts to record it.