The idea is that the user would use a stylus to draw predefined gesture on a touch screen which then would be automatically recognized. According to the patent application this could be accomplished through determining a location of the gesture, determining identity of the stylus, locking an item displayed at the location determined and by recording identity of the stylus. This would be achieved by using a controller which compares “the identity code of the stylus to a pre-stored identity code, wherein the pre-stored identity code is registered as authorized to perform secure operations with the digitizer sensor.” Restricting the gesture-unlock or annotation-feature to just a specific stylus pen would increase the security of such a system by blocking access from other persons/devices. While this is a new patent application, the method goes back to 2012 where it first was presented by its original inventors at N-trig – Leonard Engelhardt, Guy Paradis and Tomer Kahan who now is an industrial engineering scientist working for Magic Leap. Microsoft acquired N-trig, the maker of what we today know as the Surface Pen in 2015 for $30 million.
