FIELD: production of products revealing unauthorized actions on reusable substrates. SUBSTANCE: invention presents a product capable to reveal the signs of unauthorized actions on the reusable substrates. The product is especially useful for its application with the valuable reusable substrates, that are not damaged at the product removal from them. The product contains: (a) a film or a strip with an adhesive efficient at its short-time pressing, that after removal from a surface of the substrate leave no traces of any cohesive fracture on it, for example, from an automobile wind-screen, due to the film or the strip stretching, and (b) ( and at un authorized action there will be at least one damaged layer at an attempt to remove the product from the substrate surface, that will show a cohesive or interlaminar fracture. EFFECT: reliable indication of unauthorized action on a substrate. 14 cl, 1 tbl, 11 ex, 3 dwg
