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Optical disk, an optical disk barcode forming method, an optical

Cryptography – Cryptanalysis
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Optical disk, an optical disk barcode forming method, an optical

Cryptography – Equipment test or malfunction indication
Patent

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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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OPTICAL DISK, AN OPTICAL DISK BARCODE FORMING METHOD, AN...

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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OPTICAL DISK, AN OPTICAL DISK BARCODE FORMING METHOD, AN...

Cryptography – Video cryptography – Copy protection or prevention
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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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Optical disk, an optical disk barcode forming method, an...

Cryptography – Video cryptography – Copy protection or prevention
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Optical disk, optical disk barcode forming method, optical disk

Cryptography – Cryptanalysis
Patent

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Optical disk, optical disk barcode forming method, optical...

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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Optical encryption and decryption method and system

Cryptography – Video cryptography – Video electric signal masking
Reexamination Certificate

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Optical encryption interface

Cryptography – By modifying optical image
Patent

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Optical image encryption and decryption processes

Cryptography – By modifying optical image
Patent

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Optical network unit and optical line terminal

Cryptography – Communication system using cryptography – Fiber optic network
Reexamination Certificate

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Optical out-of-band key distribution

Cryptography – Key management – Key distribution
Reexamination Certificate

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Optical pulse calibration for quantum key distribution

Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate

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Optical recording medium and reproducing apparatus for optical r

Cryptography – Cryptanalysis
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Optical recording medium to store and access large volumes of da

Cryptography – Cryptanalysis
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