4. Cryptography
  5. Electric signal modification
  6. Having production of printed copy

David J. Kovanen

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Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent

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Method of encoding confidentiality markings

Cryptography – Electric signal modification – Having production of printed copy
Patent

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Profile ID: LFUS-PAI-P-959810

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