4. Cryptography
  5. Electric signal masking

Changsheng Xu

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Digital audio watermarking using content-adaptive, multiple...

Cryptography – Electric signal masking
Reexamination Certificate

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Method and apparatus for watermarking wavetable synthesis...

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2737538

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