FIELD: printing.
SUBSTANCE: in the structure of the reproduced colour image of the concealed security element divided into fragments the information about authenticity of the protected object is encoded. The authenticity control of printed products is carried out by extracting the element structure from the basic colour components of the scanned reproduced image by combining these fragments into a security element and decoding the information encoded in it.
EFFECT: increase in reliability of protection by modifying the colour image of the security element and placing it in the areas appropriate in colour of contrast background.
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