Process for the broadcasting of programmes with progressive conditional access and separation of the information flow and the corresponding receiver
First Claim
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1. A method for broadcasting programs with progressive conditional access, comprising the steps of:
- breaking an information flow of a program into a first flow and a second flow, said breaking step comprising,arranging said first flow into a channel of order i in groups of m successive fixed length frames, said fixed length frames comprising variable length channels arranged in plural orders,arranging said second flow into the channel of order i in groups of p successive fixed length frames;
scrambling the second flow with a control word; and
transmitting an entitlement checking message with said program so that a receiver equipped with an access right may descramble and restore the information flow, reception of the first flow resulting in a partially discernable program and reception of said second flow, once descrambled, resulting in complete restoration of the program, said transmitting step comprising the steps of,transmitting said program in said channel of order i, andmultiplexing said groups of m successive fixed length frames alternately with said groups of p successive fixed length frames.
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Abstract
Process for the broadcasting of programmes with progressive conditional access and separation of the information flow, as well as the corresponding receiver,
In order to form the elementary flow, groups of m successive elements of the multiplex are taken and for forming the complimentary flow groups of p successive elements of the multiplex are taken.
Application to television with entitlement checking.
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Citations
20 Claims
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1. A method for broadcasting programs with progressive conditional access, comprising the steps of:
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breaking an information flow of a program into a first flow and a second flow, said breaking step comprising, arranging said first flow into a channel of order i in groups of m successive fixed length frames, said fixed length frames comprising variable length channels arranged in plural orders, arranging said second flow into the channel of order i in groups of p successive fixed length frames; scrambling the second flow with a control word; and transmitting an entitlement checking message with said program so that a receiver equipped with an access right may descramble and restore the information flow, reception of the first flow resulting in a partially discernable program and reception of said second flow, once descrambled, resulting in complete restoration of the program, said transmitting step comprising the steps of, transmitting said program in said channel of order i, and multiplexing said groups of m successive fixed length frames alternately with said groups of p successive fixed length frames. - View Dependent Claims (2, 3, 4, 5, 12)
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6. A method for broadcasting programs with progressive conditional access, comprising the steps of:
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breaking an information flow of a program into a first flow and a second flow, said breaking step comprising, arranging said first flow into a channel of order i in groups of m successive packets, and arranging said second flow into the channel of order i in groups of p successive packets; scrambling the second flow with a control word; and transmitting an entitlement checking message with said program so that a receiver equipped with an access right may descramble and restore the information flow, reception of the first flow resulting in a partially discernable program and reception said second flow, once descrambled, resulting in complete restoration of the program, said transmitting step comprising, multiplexing said groups of m successive packets alternately with said groups of p successive packets. - View Dependent Claims (7, 8, 9, 10, 11, 13)
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14. A receiver for receiving programs transmitted with progressive conditional access, comprising:
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means for subdividing a transmitted information flow into a first flow of m successive elements and a second flow of p successive elements, the respective groups of m successive elements alternating with the groups of p successive elements; means for recognizing at least one entitlement checking message in the transmitted information flow and for extracting therefrom at least one control word and at least one access condition; means for checking if said at least said one access condition is satisfied by said receiver; means for descrambling at least the second information flow using said at least one control word if the at least one of said access condition is satisfied as checked by said means for checking; and at least one of a video, an audio and a data receiver configured to receive at least the second flow of p successive elements and a descrambled complimentary flow corresponding to said second flow of p successive elements if the access condition is satisfied. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification