FIELD: protection from the document falsification. SUBSTANCE: multilayer material has the following layers: two lacquered layers made of polyacrylate, a layer of diffraction structure between them, a stabilizing layer on the basis of the optically transparent film of polyester which is thermostable at the temperature of at least 170 C and the thickness of 9-30 micrometers and a glue layer made of the film on the basis of polymethyl methacrylate with the thickness of at least 3 micrometers which becomes adhesive during the heating up to 110 C and which connects the multilayer material with the substrate. The first lacquered layer has the thickness of 0.5-1.0 micrometers, the second 0.15-1.5 micrometers. The material additionally has an intermediate adhesive layer with the thickness of 0.8-2.0 micrometers made of the film on the basis of polyurethane, disposed between the stabilizing and the first lacquered layer and ensuring their stable cohesion. The intermediate adhesive layer of the multilayer material has one zone of cohesion which fully connects the stabilizing and the first lacquered layers. The intermediate layer has a definite pattern with several zones of cohesion which are divided by means of the intermediate zones. The intermediate layer can contain a means increasing the adhesion in the cohesion zones and a dividing means in the intermediate zones. The glue layer has a definite pattern of dividing oslands and cohesion bridges. On the side opposite to the first lacquered layer, the stabilizing layer has the glue one of the cold gluing together. The mark on the basis of the multilayer material with the diffraction structure is connected with the bearing film with the possibility of separating. The marks on the bearing film are disposed in a definite order and orientation. The bearing film is made of transparent one coated by silicone and has a glue layer for hot gluing together on the side with marks. The method of protecting the certificate using the multilayer material lies in the following: a mark with the diffraction structure is cut out of the multilayer material, is disposed on the adjoining parts of the surfaces of the certificate and the photo. Part of the surface of the mark glue layer is fast connected with the photo. The other part of the surface is connected with the certificate substrate during the heating. Thus the problem of protecting from the falsification of symbols and marks on the basis of the multilayer material glued on the substrate is solved. The availability of the stabilizing layer solves the problem of the overheating of the material diffraction structure during the symbol gluing. EFFECT: enhanced efficiency. 8 cl, 6 dwg
