Patent ID: 7702589

Claim:
A method comprising: receiving data by a first conditional access unit, the data including scrambled content, a scrambled first control word and a scrambled second control word, wherein the first and second control words correspond to the first conditional access unit and a second conditional access unit, respectively; descrambling the first control word by the first conditional access unit; producing a plurality of data streams by descrambling the scrambled content from the data by the first conditional access unit using the first control word in the unscrambled format, wherein the plurality of data streams comprise a first data stream comprising the descrambled content and a scrambled second data stream comprising the scrambled content and the second scrambled control word; sending the descrambled content from the first data stream to a display device while sending the second data stream to a storage device, by the first conditional access unit; retrieving the second data stream from the storage device, retrieving the scrambled second control word from the second data stream and recovering the second control word in an unscrambled format by descrambling the second control word, by the second conditional access unit; and retrieving by the second conditional access unit the content from the second data stream by descrambling the scrambled content using the second control word in the unscrambled format.