METHODS AND SYSTEMS USING MULTIPLE WATERMARKS - Patent 1264268

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EP 1 264 268 A1

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(43)	Date of publication:
	11.12.2002 Bulletin 2002/50

(21)	Application number: 00973864.2

(22)	Date of filing: 25.10.2000

(51)	International Patent Classification (IPC)⁷: G06K 9/00

(86)	International application number:
	PCT/US0029/454

(87)	International publication number:
	WO 0103/3495 (10.05.2001 Gazette 2001/19)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

03.11.1999 US 433104

(71)	Applicant: Digimarc Corporation
	Tualatin, OR 97062 (US)

(72)	Inventors:
	RHOADS, Geoffrey, B. West Linn, OR 97068 (US) GUSTAFSON, Ammon, E. Beaverton, OR 97008 (US)

(74)	Representative: Meddle, Alan Leonard
	Forrester & BoehmertPettenkoferstrasse 20-22 80336 München 80336 München (DE)

(54)	METHODS AND SYSTEMS USING MULTIPLE WATERMARKS