4. Cryptography
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Cooperative encoding of data by pluralities of parties

Cryptography – Particular algorithmic function encoding
Reexamination Certificate

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Copy file mechanism for transferring files between a host system

Cryptography – Key management – Having particular key generator
Patent

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Copy indicating security device

Cryptography – Cryptanalysis
Patent

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Copy prevention apparatus and method therefor

Cryptography – Cryptanalysis
Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Cryptanalysis
Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Cryptanalysis
Patent

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Copy prevention method and apparatus for digital video system

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy prevention method and apparatus of a digital magnetic recor

Cryptography – Cryptanalysis
Patent

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Copy prevention method and apparatus of a digital...

Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent

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Copy protection apparatus and method

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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Copy protection circuit for a data in a memory

Cryptography – Key management – Having particular key generator
Patent

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Copy protection for digital motion picture image data

Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate

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Copy protection for recorded media

Cryptography – Cryptanalysis
Patent

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Copy protection for video signal added pulses

Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate

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Copy protection for video signal using added negative...

Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate

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