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Method to upgrade content encryption

  • US 10,057,641 B2
  • Filed: 05/26/2009
  • Issued: 08/21/2018
  • Est. Priority Date: 03/25/2009
  • Status: Active Grant
First Claim
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1. A decryption method, comprising:

  • at a video content receiver device, receiving a stream of digital video content which is selectively encrypted such that the digital video content contains a plurality of encrypted segments of the digital video content that are encrypted using a predetermined encryption method;

    demultiplexing the digital video content to select the encrypted segments;

    buffering the encrypted segments of the digital video content in a buffer memory that is accessible by a main processor forming part of the video content receiver device;

    the main processor selecting the encrypted segments of the digital video content and sending the encrypted segments of the digital video content to a smartcard over a smartcard interface;

    at the smartcard, receiving the encrypted segments of the digital video content and decrypting the encrypted segments of the digital video content to produce decrypted segments of the digital video content;

    the main processor receiving the decrypted segments of the digital video content from the smartcard over the smartcard interface; and

    the main processor storing the decrypted segments of the digital video content to the buffer memory, wherein before the encrypted segments of the digital video content are sent over the smartcard interface, the main processor forming part of the video content receiver device encrypts the encrypted segments of the digital video content using a local key and after reception by the smartcard, the encrypted segments of the digital video content are decrypted with the local key.

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