the patent is bullshit. it doesn't provide the magical means of how to technically decide that something is a viewer or not and the other stuff is obvious. it doesn't take a genius to come up with that hey it would be nice to detect if someone is viewing while you input your pin. but it would take a genius to sit in the box24 /7 to figure out if there was a camera somewhere or not!
"Intruder analysis module scans the input for viewers, and classifies them as either intruders or safe viewers. Intruder analysis module also scans the input for cameras or camera-equipped devices (e.g., SLR cameras, camera-equipped cellular phones, point-and-shoot cameras, building-mounted camera systems, etc.). Intruder analysis module may classify an object as a viewer or camera using any number of detection algorithms. For example, intruder analysis module may apply motion detection algorithms on the sensor information, and may classify any moving object as a viewer"