(19)

(11)

EP 1 222 573 A2

(12)

(88) Date of publication A3: 30.09.2001 (43) Date of publication: 17.07.2002 Bulletin 2002/29 (21) Application number: 00956679.5 (22) Date of filing: 29.08.2000

(51) International Patent Classification (IPC)7: G06F 17/30 (86) International application number: PCT/GB0003/325 (87) International publication number: WO 0115/012 (01.03.2001 Gazette 2001/09)

(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 (30) Priority: 26.08.1999 WO PCT/GB99/02820 05.11.1999 GB 9926272 (71) Applicant: Symtec Limited Douglas,Isle of Man IM1 1JB (GB)	(72) Inventor: CLIFTON-BLIGH, Gervase London W11 3HL (GB) (74) Representative: Howe, Steven  Lloyd Wise, Tregear & Co.,Commonwealth House,1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)