(19)
(11) EP 1 396 142 B8

(12) CORRECTED EUROPEAN PATENT SPECIFICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 B1)

(48) Corrigendum issued on:
08.06.2005 Bulletin 2005/23

(45) Mention of the grant of the patent:
13.04.2005 Bulletin 2005/15

(21) Application number: 02764596.9

(22) Date of filing: 04.06.2002
(51) International Patent Classification (IPC)7: H04N 1/32
(86) International application number:
PCT/EP2002/006928
(87) International publication number:
WO 2002/101522 (19.12.2002 Gazette 2002/51)

(54)

METHOD OF AUTHENTICATING A PLURALITY OF FILES LINKED TO A TEXT DOCUMENT

VERFAHREN ZUM AUTHENTIFIZIEREN MEHRERER MIT EINEM TEXTDOKUMENT VERBUNDENER DATEIEN

PROCEDE D'AUTHENTIFICATION D'UNE PLURALITE DE FICHIERS LIES A UN DOCUMENT TEXTE

(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(30) Priority: 12.06.2001 EP 01480047

(43) Date of publication of application:
10.03.2004 Bulletin 2004/11

(73) Proprietors:
  • International Business Machines Corporation
    Armonk, NY 10504 (US)
    Designated Contracting States:
    AT BE CH CY DE DK ES FI FR GB GR IE IT LU NL PT SE TR LI 
  • IBM France
    92400 Courbevoie (FR)
    Designated Contracting States:
    MC 

(72) Inventor:
  • CARRO, Fernando, Incertis
    E-46182 Valencia (ES)

(74) Representative: Etorre, Yves Nicolas 
Compagnie IBM France, Département Propriété Intellectuelle
06610 La Gaude
06610 La Gaude (FR)


(56) References cited: : 
WO-A-00/77677
 US-A- 5 499 294
   
  • BRASSIL J T ET AL: "ELECTRONIC MARKING AND IDENTIFICATION TECHNIQUES TO DISCOURAGE DOCUMENT COPYING" IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, IEEE INC., vol. 13, no. 8, 1 October 1995 (1995-10-01), pages 1495-1503, XP000536617 NEW YORK, US ISSN: 0733-8716
  • SU J K ET AL: "Digital watermarking of text, image, and video documents" COMPUTERS AND GRAPHICS, PERGAMON PRESS LTD., vol. 22, no. 6, December 1998 (1998-12), pages 687-695, XP004154716 OXFORD, GB ISSN: 0097-8493
   
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).