FIELD: counterfeit, forgery, and falsification protection of musical instruments. SUBSTANCE: in choosing each part of surface random law is used to set coordinates of any point which is referred to in setting shape and size of this part of surface; than information about these coordinates, shape, and mentioned information about picture of the part of surface are recorded; during authentication mentioned part of surface is found on object being authenticated by recorded coordinates and shape whereupon picture of this part of surface is recorded. EFFECT: provision for recording microstructure of parts on surface of object under protection. 5 cl, 1 dwg
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