Plastic film in the form of a thin polymer sheet incorporating a plurality of micro-optic systems that present a pattern of images, text, data, or other identifying indicia to an observer for use in the fields of document and product security, authentication, and anticounterfeiting for use in determining the authenticity of an article via unassisted visual inspection

'anticounterfeit':46 'articl':55 'authent':44,52 'data':26 'determin':50 'document':40 'field':38 'film':2 'form':5 'identifi':29 'imag':24 'incorpor':11 'indicia':30 'inspect':59 'micro':16 'micro-opt':15 'observ':33 'optic':17 'pattern':22 'plastic':1 'plural':13 'polym':9 'present':20 'product':42 'secur':43 'sheet':10 'system':18 'text':25 'thin':8 'unassist':57 'use':35,48 'via':56 'visual':58

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