Google Glass and other wearable devices are now officially off-limits in the cinema.

On Wednesday, the MPAA and the National Association of Theatre Owners (NATO) announced an update to their joint policy to prevent film theft in theaters, prohibiting recording by users equipped with Google Glass or other wearables in theaters.

The update “was made to fully integrate wearable tech into the rules following a joint meeting of NATO and MPAA theatrical anti-piracy teams,” the lobbying orgs said. The announcement was made at ShowEast 2014, NATO’s annual industry confab in Hollywood, Fla.

The issue, while it hasn’t cropped up much, has prompted Hollywood to act. This January, a man who was wearing a Google Glass headset during a showing of “Jack Ryan: Shadow Recruit” at an AMC Theatres location in Columbus, Ohio, was questioned by agents from the Dept. of Homeland Security about whether he was illegally recording the film.

Here is the is full statement from the groups:

The National Association of Theatre Owners (NATO) and the Motion Picture Association of America (MPAA) have a long history of welcoming technological advances and recognize the strong consumer interest in smart phones and wearable “intelligent” devices. As part of our continued efforts to ensure movies are not recorded in theaters, however, we maintain a zero-tolerance policy toward using any recording device while movies are being shown. As has been our long-standing policy, all phones must be silenced and other recording devices, including wearable devices, must be turned off and put away at show time. Individuals who fail or refuse to put the recording devices away may be asked to leave. If theater managers have indications that illegal recording activity is taking place, they will alert law enforcement authorities when appropriate, who will determine what further action should be taken.