It's terrible though. We really live in a panopticon now.
Any links?
Not exactly the TV manufacturer doing it, but there have been reports of advertisers using ultrasonic pitches to do cross-device tracking.
Be careful which apps you allow to use your phone's microphone.
Slightly different than what gp was talking about but also deals with using invisible audio for DRM
It's terrible though. We really live in a panopticon now.
Any links?