US 7,533,266 B2
	Watermark-based access control method and device
Alphons Antonius Maria Lambertus Bruekers, Eindhoven (Netherlands); Arnoldus Johannes Lucas Maria Maandonks, Eindhoven (Netherlands); Peter-Paul Mittertreiner, Boxtel (Netherlands); and Johannes Francicus Echbertus Maria Verbruggen, Mill (Netherlands)
Assigned to Civolution B.V., Eindhoven (Netherlands)
Appl. No. 10/502,963 PCT Filed Jan. 20, 2003, PCT No. PCT/IB03/00214 § 371(c)(1), (2), (4) Date Jul. 29, 2004, PCT Pub. No. WO03/065723, PCT Pub. Date Aug. 07, 2003.
Claims priority of application No. 02075418 (EP), filed on Feb. 01, 2002.
Prior Publication US 2005/0021967 A1, Jan. 27, 2005
Int. Cl. H04L 9/00 (2006.01)

U.S. Cl. 713—176

12 Claims

1. A method of controlling access to a resource signal, comprising embedding an authorization code in a signal by means of a watermark and transmitting the watermarked signal to a verifying device, and in the verifying device, extracting the authorization code from the watermarked signal and authorizing an operation to be performed on the resource signal in dependence on the extracted authorization code, the resource signal including media content and being distinct from the watermarked signal.