Digital information signal transmitting/receiving method and system
First Claim
1. A digital information signal transmitting/receiving method in a system including a transmitter for transmitting an encrypted digital information signal and a plurality of receivers for receiving said encrypted digital information signal transmitted from said transmitter, whereinthe transmitting method in said transmitter comprises the steps of:
- transmitting a plurality of identification codes to said receivers at a time ahead of said digital information signal; and
transmitting said encrypted digital information signal; and
the receiving method in each of the receivers comprises the steps of;
detecting whether a particular identification code which is assigned to the receiver is included within a received said plurality of identification codes; and
decrypting a received said encrypted digital information signal into original digital information when said particular identification code has been detected in said detecting step.
3 Assignments
0 Petitions
Accused Products
Abstract
A digital information signal transmitting/receiving method and system having a transmitter for transmitting an encrypted digital information signal and a plurality of receivers for receiving the encrypted digital information signal from the transmitter. The transmitter simultaneously distributes a plurality of identification codes associated with the receivers at a time ahead of the digital information signal. The receivers detect whether a particular identification code assigned to the receiver was included within a received plurality of identification codes. When the particular identification code has been detected as having been received the received encrypted digital information signal is decrypted into the original digital information. In order to request that a particular identification code be included so as to allow access to a program, either one of the receivers or the recorders each generate an information request signal. The transmitter is responsive to the information request signals to add to the digital information signal at a time ahead of the digital information signal, identification signals for identifying the receivers or the recorders which generated the information request signals, thereby producing a transmission signal formed of those signals, and to distribute this transmission signal to the receivers. The recorders control the received information signal to be recorded in response to the identification signals received by the receivers.
75 Citations
27 Claims
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1. A digital information signal transmitting/receiving method in a system including a transmitter for transmitting an encrypted digital information signal and a plurality of receivers for receiving said encrypted digital information signal transmitted from said transmitter, wherein
the transmitting method in said transmitter comprises the steps of: -
transmitting a plurality of identification codes to said receivers at a time ahead of said digital information signal; and transmitting said encrypted digital information signal; and the receiving method in each of the receivers comprises the steps of; detecting whether a particular identification code which is assigned to the receiver is included within a received said plurality of identification codes; and decrypting a received said encrypted digital information signal into original digital information when said particular identification code has been detected in said detecting step. - View Dependent Claims (2, 3, 4, 6, 7)
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5. A digital information signal transmitting/receiving method in a system including a transmitter for transmitting an encrypted digital information signal, a plurality of receivers for receiving said encrypted digital information signal transmitted from said transmitter, and recorder/reproducers for recording said encrypted digital information signal received by said receivers on a recording medium and reproducing said encrypted digital information signal from said medium, wherein
the transmitting method in said transmitter comprises the steps of: -
transmitting a plurality of identification codes to said receivers at a time ahead of said digital information signal; and transmitting said encrypted digital information signal, the receiving method in each of the receivers comprises the steps of; supplying a received said plurality of identification codes and a received said encrypted digital information signal to said recorder/reproducers; detecting whether a particular identification code which is assigned to the receiver is included within a received said plurality of identification codes; and decrypting said encrypted digital information signal reproduced by said recorder/reproducer into original digital information when said particular identification code has been detected in said detecting step, and the recording/reproducing method in said recorder/reproducer comprises the steps of; placing the recorder of said recorder/reproducer in a standby mode in response to said identification codes fed from said receiver; recording said encrypted digital information signal from said receiver on said recording medium; and reproducing said encrypted digital information signal recorded on said recording medium and supplying a reproduced said encrypted digital information signal to said receiver.
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8. A digital information signal transmitting/receiving system having a transmitter for transmitting a digital information signal and a plurality of receivers for receiving said digital information signal transmitted from said transmitter, wherein
said transmitter comprises: -
means for encrypting said digital information signal to produce an encrypted digital information signal; means for generating a plurality of identification codes associated with said receivers; switching means for selectively outputting said encrypted digital information signal and said plurality of identification codes such that said plurality of identification codes are output at a time ahead of said encrypted digital information signal; encoding means for encoding an output from said switching means into a predetermined format; and modulating means for modulating an output from said encoding means and transmitting a modulated output, wherein said plurality of identification codes are transmitted at a time ahead of said digital information signal, and each of said receivers comprises; means for demodulating a received said modulated output to produce a demodulated digital signal; means for decoding said demodulated digital signal to produce a decoded digital signal; memory means for storing a particular identification signal associated with the receiver, collating means for detecting whether a same identification code as said particular identification code stored in said memory means is included within said decoded digital signal; and decrypting means for decrypting said decoded digital signal into original digital information when said particular identification code has been detected in said collating means.
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9. A digital-information signal transmitting/receiving system having a transmitter for transmitting a digital information signal, a plurality of receivers for receiving said digital information signal transmitted from said transmitter, and a recorder/reproducer for recording said digital information signal received by said receivers on a recording medium and reproducing said digital information signal, wherein
said transmitter comprises: -
means for encrypting said digital information signal to produce an encrypted digital information signal; means for generating a plurality of identification codes associated with said receivers; switching means for selectively outputting said encrypted digital information signal and said plurality of identification codes such that said plurality of identification codes are output at a time ahead of said encrypted digital information signal; first encoding means for encoding an output from said switching means into a first format; and modulating means for modulating an output from said first encoding means and transmitting a modulated output, wherein said plurality of identification codes are transmitted at a time ahead of said digital information signal, and each of said receivers comprises; means for demodulating a received said modulated output including said received identification codes and said encrypted digital information signal into a demodulated digital signal; first decoding means for decoding said demodulated digital signal and supplying a decoded digital signal to a corresponding said recorder/reproducer; memory means for storing a particular identification signal associated with the receiver; collating means for detecting whether a same identification code as said particular identification code stored in said memory means is included within said decoded digital signal; and decrypting means for decrypting said encrypted digital signal decoded by said corresponding recorder/reproducer into original digital information when said particular identification code has been detected in said collating means, and each of said recorder/reproducers comprises; second encoding means for encoding a decoded, encrypted digital information signal produced from said first decoding means into a second format; a recording/reproducing unit for recording the output from said second encoding means on said recording medium and reproducing said digital information signal from said recording medium, said recording/reproducing unit being placed in a standby mode in response to said identification codes included in the output from said second encoding means and caused to record said output on said recording medium in response to said encrypted digital information signal following said identification codes; and second decoding means for decoding a reproduced digital information signal from said recording/reproducing unit and supplying a decoded digital information signal to said receiver. - View Dependent Claims (10, 11)
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12. A digital information recording system having a transmitter for transmitting a digital information signal, a receiver for receiving said digital information signal distributed from said transmitter, and a recorder for recording said digital information signal received by said receiver, wherein
at least one of said receiver and said recorder has means for generating an information request signal, said transmitter has means which responds to said information request signal by adding to said digital information signal an identification signal for identifying a corresponding said at least one receiver and recorder which has generated said information request signal, wherein said identification signal is added to be provided at a time ahead of said digital information signal, and to transmit as a transmission signal a combined signal formed of said identification signal and said digital information signal to said receiver, and said recorder has means for controlling an operation of recording a received said digital information signal on a basis of said received identification signal.
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17. A digital information recording system having a transmitter for transmitting a digital information signal, a receiver for receiving said digital information signal distributed from said transmitter, and a recorder for recording said digital information signal received by said receiver on a recording medium, wherein
at least one of said receiver and said recorder has means for generating an information request signal, said transmitter has means which responds to said information request signal by adding identification signals to said digital information signal for identifying said at least one receiver and recorder which generated said information request signal, wherein said identification signals are added to be provided at a time ahead of said digital information signal, and to transmit a combined signal formed of said digital information signal and said identification signals to said receiver, and said recorder has control means which records said received information signal when particular identification signals assigned to said at least one receiver and recorder are received, which prevents recording when said particular identification signals are not received.
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21. A digital information recording system having a transmitter for distributing a digital information signal, a receiver for receiving said digital information signal distributed from said transmitter, and a recorder for recording said digital information signal received by said receiver on a recording medium, wherein
at least one of said receiver and said recorder has means for generating an information request signal; -
said transmitter has transmitting means which responds to said information request signals by adding to said digital information signal, identification signals for identifying said at least one receiver and recorder which generated said information request signals and a record end signal, wherein said identification signals are added to be provided at a time ahead of said digital information signal, thus producing a transmission signal formed of said digital information signal, said identification signals and said record end signal and to distribute said transmission signal to said receiver; and said recorder has control means which records a received said digital information signal when particular identification signals assigned to said at least one receiver and recorder are detected from said received identification signals and which stops recording when said record end signal is received. - View Dependent Claims (22, 23, 24, 25)
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Specification