Google patents Project Glass motion-based theft detection
 

We know that you're never gonna take your Google glasses off, but if some nefarious lout feels differently, the boys and girls in Mountain View's X lab have got you covered. The company has patented a system whereby the device can identify "unnatural" movements and lock the headset if it feels the violent motion of them being wrenched from your face. Even better, while your would-be assailant is making off with the $1,500 gear, it'll be contacting the authorities to ensure that they can't get far with their ill-gotten HMD. If nothing else, we'll won't worry as much when pre-order customers 782 and 788 go out of an evening.

http://www.engadget.com/2012/07/17/g...-theft-patent/