(19)

(11)

EP 1 979 852 A2

(12)

(88) Date of publication A3: 29.11.2007 (43) Date of publication: 15.10.2008 Bulletin 2008/42 (21) Application number: 06803339.8 (22) Date of filing: 11.09.2006

(51) International Patent Classification (IPC):  G06K 7/10(2006.01) B42D 15/00(2006.01) G09B 5/00(2006.01) G06C 23/00(2006.01) B42D 5/02(2006.01) G09B 7/06(2006.01) (86) International application number: PCT/US2006/035325 (87) International publication number: WO 2007/033084 (22.03.2007 Gazette 2007/12)

(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 LV MC NL PL PT RO SE SI SK TR (30) Priority: 12.09.2005 US 716215 P 28.11.2005 US 740007 P 28.11.2005 US 740131 P (71) Applicant: Chaum, David Sherman Oaks, CA 91403 (US)	(72) Inventor: Chaum, David Sherman Oaks, CA 91403 (US) (74) Representative: Reeve, Nicholas Edward  Reddie & Grose 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)