The principle of use is that the QR code is scanned by camera and the software decodes text information contained in the code. In Japan, QR Code has become and most mobile phones with built-in camera can decode these codes.
Do not worry. To read QR codes is not necessary to be proficient in cryptology, you have to have a properly equipped mobile phone, which nearly all of phones are. Some smartphones have QR code reader built-in when you buy the phone. To the others you have to install it manually. After launching the application appears as if the camera application. Then simply referred to as "steer" the QR code and the application will automatically translate it.
For more information about QR code and a list of applications to mobile phones, visit site.
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