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Patent US6345104 - Digital watermarks and methods for security documents - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsSecurity documents (e.g. passports, currency, event tickets, and the like) are encoded to convey machine-readable multi-bit binary information (e.g., a digital watermark), usually in a manner not alerting human viewers that such information is present. The documents can be provided with overt or subliminal...http://www.google.com/patents/US6345104?utm_source=gb-gplus-sharePatent US6345104 - Digital watermarks and methods for security documentsAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6345104 B1Publication typeGrantApplication numberUS 09/127,502Publication dateFeb 5, 2002Filing dateJul 31, 1998Priority dateMar 17, 1994Fee statusPaidAlso published asCA2338618A1, CA2338618C, CN1631030A, CN100364309C, CN101159799A, CN101159799B, DE69927218D1, DE69927218T2, EP0981113A2, EP0981113A3, EP0981113B1, EP1444823A2, EP1444823A4, US6522771, US6724912, US6750985, US6804379, US6959100, US7130087, US7418111, US7720255, US8165341, US8788971, US20010022848, US20010031065, US20020076081, US20020080995, US20020080996, US20030210804, US20050018874, US20070047765, US20090052735, US20100119108, US20100226529, WO2000007356A2, WO2000007356A3Publication number09127502, 127502, US 6345104 B1, US 6345104B1, US-B1-6345104, US6345104 B1, US6345104B1InventorsGeoffrey B. RhoadsOriginal AssigneeDigimarc CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (104), Non-Patent Citations (20), Referenced by (510), Classifications (138), Legal Events (11) External Links: USPTO, USPTO Assignment, EspacenetDigital watermarks and methods for security documents
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