The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2009
Filed:
Nov. 04, 2004
Robert Schipper, Eindhoven, NL;
Erwin Jeroen Van Dommelen, Veldhoven, NL;
Robert Schipper, Eindhoven, NL;
Erwin Jeroen Van Dommelen, Veldhoven, NL;
Irdeto Eindhoven B.V., , NL;
Abstract
A data stream contains content data that can be decrypted using control words. ECM messages that are included in the stream and contain the control words that is required for decrypting nearby content data. EMM messages contain management information for entitling selected stream receiving devices to decrypt content data from the data stream using control words from ECM messages. Further management information is included in at least some of the ECM messages. The secure device detects The further management information when the control words are supplied and tests whether the further management information is targeted at the stream receiving device (). If so the secure device indefinitely disables subsequent decryption of at least part of the stream in the stream receiving device (). In one embodiment, the further management information is targeted by means of a specified condition on entitlement information stored in the secure device. The secure device tests whether any of its entitlement information meets this condition and, if so, disables supply of valid control words.