| http://www.w3.org/ns/prov#value | - As used herein, the term ???substrate??? means any surface or substance on which a hologram is placed or held in close proximity to, including any inks, fibers, embossing, chemical treating, magnetic properties, or other properties or features of the surface or substance. [0050] Returning to FIG. 3, the image sensor 620, in addition to sensing the pattern of light diffracted by the hologram 690 or
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