Patent ID: 7116892
Filing Date: 2006-10-03
Classification: H04N

Abstract:
1. System for descrambling scrambled content, comprising a descrambler for descrambling the scrambled content, a decryption device for decrypting ECM's to obtain control words, wherein the ECM decryption device delivers control words to the descrambler, wherein the descrambler descrambles the data packets of the scrambled content using a control word having a control word identifier corresponding with the control word identifier of the data packet to be descrambled, the system further comprising a storage device for storing scrambled content and a processing unit with means to control play back of the stored content, going fast forward and going backwards, wherein the processing unit is programmed to extract ECM's and to provide the ECM's to the ECM decryption device for decryption, characterized in that the processing unit is programmed to request the ECM decryption device to provide at least a next control word (CW N ) at play back or going fast forward, and to provide at least a previous control word (CW P ) and a current control word (CW C ) at going backwards.