Patents Assigned to Irdeto Access B.V.
  • System for providing scrambled content, and system for descrambling scrambled content
    Patent number: 7116892
    Abstract: A system for providing scrambled content, comprising a control word generator, each control word including a control word identifier, a scrambler for providing a stream of scrambled data packets, and an encryption device for providing entitlement control messages (ECM's). One or more consecutive packets are scrambled using the same control word (CW). Each packet includes a control word identifier identifying the control word used. The ECM encryption device provides ECM's including a previous control word (CWP), a current control word (CWC) and a next control word (CWN). A system for descrambling scrambled content comprises a descrambler for descrambling the scrambled content and a decryption device for decrypting ECM's to obtain control words.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: October 3, 2006
    Assignee: Irdeto Access B.V.
    Inventor: Andrew Augustine Wajs
  • Method and system to store and distribute encryption keys
    Patent number: 7107462
    Abstract: A method and system to store and distribute encryption keys commences when a service provider receives a product key from a content provider. The service provider encrypts content controlled by the content provider with a secure device public key of a secure device of the service provider. The secure device of the service provider decrypts the product key with the secure device public key and encrypts the product key with a storage key associated with the secure device. The product key is then stored at the service provider.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: September 12, 2006
    Assignee: Irdeto Access B.V.
    Inventor: Robert W. Fransdonk
  • System for processing an information signal
    Patent number: 7050588
    Abstract: A system for processing an information signal comprises a system (1) for scrambling the information signal and at least one system (2) for descrambling the scrambled information signal. The scrambling system (1) comprises means (3,6) for analysing the entropy distribution of the information signal, means (5,6,7,9) for scrambling the information signal in dependence on the entropy distribution of the information signal to provide a scrambled information signal having an entropy distribution corresponding with the entropy distribution of the information signal and means (11) for compressing the scrambled information signal. The descrambling system (2) comprises means (14) for decompressing the compressed scrambled information signal and means (16,19,21,22,24) for descrambling the scrambled information signal to provide the information signal.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: May 23, 2006
    Assignee: Irdeto Access B.V.
    Inventors: Andrew Augustine Wajs, Gerard Johan Dekker