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Adhesive photocopyable transparency for use in a secure facsimil

Cryptography – By modifying optical image
Patent

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Anticounterfeiting method and device utilizing holograms and pse

Cryptography – By modifying optical image
Patent

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Apparatus and method for computer screen security

Cryptography – By modifying optical image
Reexamination Certificate

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Authenticating pseudo-random code and apparatus

Cryptography – By modifying optical image
Patent

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Authentication method and system

Cryptography – By modifying optical image
Reexamination Certificate

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Automatic secure transmission and reception of pictorial informa

Cryptography – By modifying optical image
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