Process for recording a scrambled MPEG stream
DCFirst Claim
Patent Images
1. A process for recording, on a recording medium, a scrambled digital video stream, implementing the following steps, in addition to the recording of the scrambled data:
- descrambling of said scrambled data of said stream so as to extract therefrom additional data corresponding to information required by at least one function of the special mode or “
trick mode”
(fast forward, fast rewind, accelerated motion, slow motion, etc.); and
recording of these additional data on the recording medium.
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Abstract
A process whereby scrambled data of the stream are, in parallel with their recording (6), descrambled (2, 3) so as to extract (4) therefrom additional data corresponding to information required by at least one function of the special mode or “trick mode” (fast forward, fast rewind, accelerated motion, slow motion, etc.). These additional data are also recorded (6) on the recording medium. Applications relate most particularly to recordings on hard disk or DVD.
73 Citations
15 Claims
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1. A process for recording, on a recording medium, a scrambled digital video stream, implementing the following steps, in addition to the recording of the scrambled data:
descrambling of said scrambled data of said stream so as to extract therefrom additional data corresponding to information required by at least one function of the special mode or “
trick mode”
(fast forward, fast rewind, accelerated motion, slow motion, etc.); and
recording of these additional data on the recording medium.- View Dependent Claims (2, 3, 4)
- 5. A process for recording on a recording medium, a scrambled digital video stream, comprising a step for descrambling the stream in such a way as to extract additional data relating to the keys for enciphering this scrambled stream and a step for recording these data on the recording medium.
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14. A process for decoding a scrambled MPEG stream recorded on a recording medium, for implementing a special mode (“
- trick mode”
), comprising the following steps;reading, from the recording medium, of scrambled data of the MPEG stream, reading, from the recording medium, of additional data other than the scrambled data of the MPEG stream, having a time correspondence with the scrambled data and corresponding to information relating to the enciphering keys used for the scrambling, descrambling of the MPEG stream data read as a function of the additional data read.
- trick mode”
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15. A process for decoding a scrambled MPEG stream recorded on a recording medium, for implementing a special mode (“
- trick mode”
), comprising the following steps;reading, from the recording medium, of additional data, other than the scrambled data of the MPEG stream, corresponding to information required by at least one function of the special mode or “
trick mode”
(fast forward, fast rewind, accelerated motion, slow motion, etc.),reading, from the recording medium, of scrambled data of the MPEG stream which are determined as a function of the said additional data.
- trick mode”
Specification