How about a light, a beep, and an RF broadcast? When the camera is on, the LED on the glasses lights, the glasses beep, your phone beeps, and the glasses send

How about a light, a beep, and an RF broadcast? When the camera is on, the LED on the glasses lights, the glasses beep, your phone beeps, and the glasses send an RF broadcast to all nearby phones so those phones beep. In fact, the nearby phones could reply with a message that says "do not record" preventing the glasses from recording. Everyone within range would have to approve the recording. If someone new moves into range their approval is also needed, so the glasses must continually send "can I record?" queries to surrounding devices. Anyone who does not want to be recorded can get a cheap RF badge that replies to all "can I record?" messages with "No". The RF could be range limited so that people far away do not get a vote. Maybe the RF range would have to vary depending on whether the glasses camera is zoomed in or not. All cameras could have this approval system making approval/disapproval automatic. The same could be done for audio recording. "Virtual Walls: Protecting Digital Privacy in Pervasive Environments" https://homes.luddy.indiana.edu/kapadia/papers/walls_pervasive07.pdf https://homes.luddy.indiana.edu/kapadia/papers/walls_pervasi...