Patent classifications
G
PHYSICS
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G06
COMPUTING OR CALCULATING; COUNTING
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G06K
GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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19/00
Record carriers for use with machines and with at least a part designed to carry digital markings
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G06K19/06
characterised by the kind of the digital marking, e.g. shape, nature, code
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G06K19/08
using markings of different kinds; or more than one marking of the same kind; in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
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G06K19/10
at least one kind of marking being used for authentication, e.g. of credit or identity cards
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G06K19/16
the marking being a hologram or diffraction grating
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