(19)

(11)

EP 1 726 117 A2

(12)

(88) Date of publication A3: 27.10.2005 (43) Date of publication: 29.11.2006 Bulletin 2006/48 (21) Application number: 05729199.9 (22) Date of filing: 18.03.2005

(51) International Patent Classification (IPC):  H04L 9/00(2006.01) (86) International application number: PCT/US2005/009072 (87) International publication number: WO 2005/091547 (29.09.2005 Gazette 2005/39)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 18.03.2004 US 554541 P 18.03.2004 US 554543 P 31.03.2004 US 558767 P (71) Applicant: Digimarc Corporation Beaverton, OR 97008 (US)	(72) Inventors: SHARMA, Ravi, K. Portland, OR 97229 (US) RAMOS, Daniel, O. Beaverton, OR 97007 (US) RODRIGUEZ, Tony, F. Portland, OR 97212 (US) LEVY, Kenneth, L. Stevenson, WA 98648 (US) (74) Representative: Hoarton, Lloyd Douglas Charles  Forrester & Boehmert, Pettenkoferstrasse 20-22 80336 München 80336 München (DE)