QR code stands for Quick Response Code, in Japan very common two-dimensional code. Many mobile phones with built-in camera can read the code. The QR code is square and, easily recognized by his Almanacs, nested light and dark squares in three corners. There are four error correction levels that allow a reconstruction in damage of 7% (level L) to 30% (step H). There can be each code more than 4000 alphanumeric characters encoded.