(19)

(11)

EP 1 829 270 A2

(12)

(43) Date of publication: 05.09.2007 Bulletin 2007/36 (21) Application number: 04811253.6 (22) Date of filing: 18.11.2004

(51) International Patent Classification (IPC):  H04L 9/00(2006.01) (86) International application number: PCT/US2004/038474 (87) International publication number: WO 2006/054988 (26.05.2006 Gazette 2006/21)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR Designated Extension States: AL HR LT LV MK YU (71) Applicant: ContentGuard Holdings, Inc. Wilmington, Delaware 19803 (US)	(72) Inventors: RALEY, Michael Downey, CA 90242 (US) CHEN, Eddie Rancho Palos Verdes, CA 90275 (US) (74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät  Maximilianstrasse 58 80538 München 80538 München (DE)