FIELD: technological processes.
SUBSTANCE: invention relates to a data carrier, first of all a valuable or tamper-proof document, with a substrate that includes at least one paper layer, moreover, a windowed security thread is embedded in the substrate, said thread is visible on at least one surface of the substrate in predetermined windowed regions. According to the invention, the windowed regions should include micro-windows created using the paper-making process, these micro-windows have an edge created during the manufacture of paper with characteristic irregularities and whose width transverse to the direction of the thread does not exceed 50 % of the width of the thread and ranges from 0.2 mm to 4 mm.
EFFECT: method for protecting a document against forgery has been proposed.
16 cl, 7 dwg
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