Tamper resistant data protection security laminates

The present invention provides for a tamper resistant data protection security laminate structure in the form of a holographic and/or diffractive security laminate, wherein the laminate base film consists of a relatively thin base film of a fragile, frangible material, characterised by having a low internal strength and a tendency to tear or distort under heat or mechanical attack to provide visible damage and destruction of the holographic image and data protection laminate, and wherein the laminate carries a holographic and / or diffractive security image visible for authentication to an observer under normal lighting conditions and wherein remainder of the film is made up of a relatively thick layer of a suitable hard permanent adhesive which under normal room temperature is a solid material characterised such that under high temperature heat attack the permanent adhesive eventually softens and melts but the frangible base material at this point has insufficient internal strength to be self supporting and is visibly damaged upon attempted removal and wherein the thickness of frangible base film lies within the range of 5% to 60% as a proportion of the total laminate thickness.