FIELD: optics.
SUBSTANCE: invention relates to optical devices, as well as to methods of their production and application. Protective device forms part of the protected document and contains at least one fluid medium capable of reversible redistribution within the range of the device under the action of an external stimulus causing a change of the position of at least part of it by at least 1 mm as the result of at least flowing the fluid medium and/or its expansion, and/or its compression changing optical properties of the device.
EFFECT: technical result of the declared invention is creation of a protective device with variable optical properties and a method of authenticating (legitimating) of the protected document.
27 cl, 10 dwg
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