FIELD: information technology.
SUBSTANCE: record medium of together with the written down data contains recesses generated along paths, with the data written down on them containing the information about protection against copying, intended for coding and/or decoding. The recesses are generated on some sites of a path, are displaced relative to the central line of the path to the left and/or to the right to generate the alternating or alternating chains of recesses located along a wavy line. Thus in a configuration of deviation of the specified recesses the information on the key for coding and/or decoding is coded.
EFFECT: increase in the efficiency of playback and improvement of protection of the record medium from copying.
62 cl, 11 dwg
