Googlers develop AI that can catch people looking at your screen

Google researchers have developed a tool that can alert you when a stranger is peeking at your screen over your shoulder. The "electronic screen protector", as it is called by inventors Florian Schroff and See Jung Ryu, will be presented at the Neural Information Processing Systems (NIPS) conference that will be held in California next week. 

So, what is this "electronic screen protector" and how does it work? In a nutshell, it appears that it is a software application that uses machine learning and the front camera of a phone to scan ...