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Patterning device for security facsimile systems

Cryptography – By modifying optical image
Patent

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Photographic products and methods employing embedded information

Cryptography – By modifying optical image
Patent

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Procedure for marking binary coded data sets

Cryptography – By modifying optical image
Reexamination Certificate

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Projector with enhanced security camcorder defeat

Cryptography – By modifying optical image
Reexamination Certificate

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