· Type: Character codes : 2, number + letter codes : 3, arithmetic codes : 4, the formula Q codes : not found, this is the only kind of FIG. 5, coordinate type codes : 6, squared codes : 7, the slider verification ..
Disposition:
· A. Require developers verification value or a fixed shield
· B. Universal codes (codes only the interface, the corresponding results)
· C. Manual techniques (complete coding platform), machine learning (big data processing, consuming high cost) \
Removing codes provided universal code verification code recognition recording cookie