FIELD: coding of special-purpose information: document cost, date of its issue, Serial No, etc. SUBSTANCE: a sequence of coded words is applied onto the safety thread, each word consists of a great number of primary information elements having the same length, each word contains a fixed number of segments. All words in the sequence are identical, information picked up from each segment is determined by cyclic relation between the active or activated zone of the segment and the total length of the given segment, and the constant number of segments comprises the first continuous sequence of segments having the first information significance, and the second sequence of segments having the second information significance. EFFECT: enhanced reliability. 7 cl, 7 dwg
