Thwart special recognition system which chinese company is the global leader. >> digitalization is turning china into surveillance space. facial recognition, dna collection committees empowering the state to control, to monitor, to manipulate china's vast population. >> benjamin: many other protesters turned up tracking on their phones and beefed up their digital settings. because recent prosecutions and protest leaders have used video and digital data to win convictions. china is warning the u.s. not to interfere. >> we urge the united states to exercise caution in its words and deeds and sto...