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Digital watermarks
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Patent number 6,961,853
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Issue date Nov 1, 2005
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Hewlett-Packard Development Company, L.P.
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Alan D. Marshall
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G06 - COMPUTING CALCULATING COUNTING
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Secure messaging systems
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Patent number 4,888,800
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Issue date Dec 19, 1989
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Hewlett-Packard Company
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Alan D. Marshall
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Secure messaging systems
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Patent number 4,866,707
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Issue date Sep 12, 1989
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Hewlett-Packard Company
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Alan D. Marshall
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H04 - ELECTRIC COMMUNICATION TECHNIQUE