(19)
(11) EP 1 034 648 A1

(12)

(43) Date of publication:
13.09.2000 Bulletin 2000/37

(21) Application number: 99932875.0

(22) Date of filing: 09.07.1999
(51) International Patent Classification (IPC)7H04L 29/06
(86) International application number:
PCT/EP9904/930
(87) International publication number:
WO 0004/688 (27.01.2000 Gazette 2000/04)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 14.07.1998 US 92725 P
27.05.1999 US 320806

(71) Applicant: Koninklijke Philips Electronics N.V.
5621 BA Eindhoven (NL)

(72) Inventor:
  • EPSTEIN, Michael
    NL-5656 AA Eindhoven (NL)

(74) Representative: Faessen, Louis Marie Hubertus et al
INTERNATIONAAL OCTROOIBUREAU B.V.,Prof. Holstlaan 6
5656 AA Eindhoven
5656 AA Eindhoven (NL)

   


(54) METHOD AND APPARATUS FOR USE OF A WATERMARK AND A RECEIVER DEPENDENT REFERENCE FOR THE PURPOSE OF COPY PROTECTION