Digital signal transmitting method, digital signal receiving apparatus, and recording medium and method
AssigneeSony Corporation
InventorsYukio Kubota, Koichi Goto
Life of this patent
Estimating the term…
Abstract
A digital signal transmitting method, a digital signal receiving apparatus, and a recording medium which ensure the security of fee-charged software information. When an image providing predetermined services is transmitted, a band-compression coded digital video signal is given first-encryption processing and then the digital signal is further given encryption processing and transmitted. Therefore, double security can be added to the video signal and a digital signal transmitting method where its security is more firmly ensured can be realized.
Claims28
A method for transmitting a digital signal, comprising the steps of:
- band-compression coding a first digital signal and a second digital signal, each respective digital signal defining an image;
- encrypting the band-compression coded first digital signal;
- multiplexing the encrypted first digital signal and the band-compression coded second digital signal;
- and
- encrypting the multiplexed first and second digital signals to form said digital signal for transmission.
Apparatus for transmitting a digital signal, comprising:
- means for band-compression coding a first digital signal and a second digital signal, each respective digital signal defining an image;
- means for encrypting the band-compression coded first digital signal;
- means for multiplexing the encrypting first digital signal and the band-compression coded second digital signal;
- and
- means for encrypting the multiplexed first and second digital signals to form said digital signal for transmission.
Digital signal receiving apparatus for receiving a digital video signal formed by multiplexing an encrypted first digital signal and a band-compression coded second digital signal and by encrypting the multiplexed first and second digital signals, said digital video signal encrypted with a first and second encryption key and transmitted by a broadcasting station, comprising:
- first-decryption means for decrypting said digital video signal encrypted with said first encryption key;
- recording/reproducing means for recording the first-decrypted digital video signal on a recording medium and for reproducing the first-decrypted digital video signal from said recording medium;
- and
- second-decryption means for decrypting the reproduced first-decrypted digital video signal encrypted with said second encryption key.
A recording medium comprising data recorded thereon, said data defined by a digital video signal formed by multiplexing an encrypted first digital signal and a band-compression coded second digital signal and by encrypting the multiplexed first and second digital signals.
A method for transmitting a digital transmission signal, comprising the steps of:
- providing a first digital signal and a second digital signal, wherein the first digital signal is digital software data for a digital software distribution service;
- encrypting the first digital signal with a first encryption key;
- wherein said digital software data is to be stored on a storage medium at a receiver side in an encrypted form encrypted with the first encryption key to secure the stored digital software data;
- multiplexing the encrypted first digital signal and the second digital signal;
- and
- encrypting the multiplexed digital signals with a second encryption key to form said digital transmission signal and to secure the digital transmission signal.
A method for transmitting a digital transmission signal, comprising the steps of:
- providing a digital signal, wherein the digital signal is digital software data for a digital software distribution service;
- encrypting the digital signal with a first encryption key;
- wherein said digital software data is to be stored on a storage medium at a receiver side in an encrypted form encrypted with the first encryption key to secure the stored digital software data;
- multiplexing with other signals said encrypted digital signal encrypted with said first encryption key;
- and
- encrypting the encrypted digital signal with a second encryption key to form said digital transmission signal and to secure the digital transmission signal.
A method for transmitting a digital transmission signal, comprising the steps of:
- providing a digital signal, wherein the digital signal is digital software data for a digital software distribution service;
- encrypting the digital signal with a first encryption key;
- encrypting the encrypted digital signal with a second encryption key to form said digital transmission signal and to secure the digital transmission signal;
- and
- charging a software fee to a user when said encrypted digital software data is reproduced from said storage medium at said receiver side and decrypted with a decryption key corresponding to said first encryption key at said receiver side;
- wherein said digital software data is to be stored on a storage medium at a receiver side in an encrypted form encrypted with the first encryption key to secure the stored digital software data.
A method for transmitting a digital transmission signal, comprising the steps of:
- providing a digital signal, wherein the digital signal is digital software data for a digital software distribution service;
- encrypting the digital signal with a first encryption key;
- wherein said digital software data is to be stored on a storage medium at a receiver side in an encrypted form encrypted with the first encryption key to secure the stored digital software data;
- and
- encrypting the encrypted digital signal with a second encryption key to form said digital transmission signal and to secure the digital transmission signal;
- wherein said digital software data is one of video software, music software and game software.
Digital transmission apparatus for transmitting a digital transmission signal, comprising:
- means for providing a first digital signal and a second digital signal, wherein the fist digital signal is digital software data for a digital software distribution service;
- a first encryption circuit for encrypting the first digital signal with a first encryption key;
- wherein said digital software data is to be stored on a storage medium at a receiver side in an encrypted form encrypted with the first encryption key to secure the stored digital software data;
- a multiplexer for multiplexing the encrypted first digital signal and the second digital signal;
- and
- a second encryption circuit for encrypting the multiplexed digital signals with a second encryption key to form said digital transmission signal and to secure the digital transmission signal.
Digital signal receiving apparatus for receiving a digital transmission signal formed by encrypting a digital signal with a first encryption key and by encrypting the encrypted digital signal with a second encryption key to secure the digital transmission signal, wherein the digital signal is digital software data for a digital software distribution service, said digital signal receiving apparatus comprising:
- a decryption circuit for decrypting said digital transmission signal with a second decryption key corresponding to said second encryption key;
- an extracting circuit for extracting said digital signal in an encrypted form, the extracted digital signal having been encrypted with said first encryption key;
- an outputting circuit for outputting the extracted digital signal to a recording/reproducing circuit which is connected via a digital bus or provided in the digital signal receiving apparatus in order to record the extracted digital signal on a storage medium in an encrypted form;
- and
- a communication circuit for communicating billing information with a billing center, wherein a software fee is charged to a user where said recorded digital signal is reproduced from said storage medium and decrypted with a first decryption key corresponding to said first encryption key.
A method for receiving a digital transmission signal formed by encrypting a digital signal with a first encryption key and by encrypting the encrypted digital signal with a second encryption key to secure the digital transmission signal, wherein the digital transmission signal is digital software data for a digital software distribution service, said method comprising the steps of:
- decrypting said digital transmission signal with a second decryption key corresponding to said second encryption key;
- extracting said digital signal in an encrypted form, the extracted digital signal having been encrypted with said first encryption key;
- outputting the extracted digital signal to a recording/reproducing circuit which is connected via a digital bus or provided in a digital receiving apparatus in order to record the extracted digital signal on a storage medium in an encrypted form;
- and
- communicating billing information with a billing center, wherein a software fee is charged to a user when said recorded digital signal is reproduced from said storage medium and decrypted with a first decryption key corresponding to said first encryption key.
A method of transmitting a digital signal, the method comprising the steps of:
- compressing a first digital signal and a second digital signal;
- encrypting said compressed first digital signal with a first encryption key (Km);
- multiplexing the encrypted compressed first digital signal and compressed second digital signal;
- encrypting the multiplexed first and second digital signals with a second encryption key (Ks);
- receiving an inquiry to reproduce said first digital signal stored on a recording medium of a receiver;
- confirming registration of a subscriber who owns said receiver in response to said inquiry;
- performing a billing processing if said registration is confirmed;
- and
- transmitting said first encryption key (Km) to said receiver after said billing processing is performed.
Apparatus for transmitting a digital signal, the apparatus comprising:
- means for compressing a first digital signal and a second digital signal;
- means for encrypting said compressed first digital signal with a first encryption key (Km);
- means for multiplexing the encrypted compressed first digital signal and compressed second digital signal;
- means for encrypting the multiplexed first and second digital signals with a second encryption key (Ks);
- means for receiving an inquiry to reproduce said first digital signal stored on a recording medium of a receiver;
- means for confirming registration of a subscriber who owns said receiver in response to said inquiry;
- means for performing a billing processing if said registration is confirmed;
- and
- means for transmitting said first encryption key (Km) to said receiver after said billing processing is performed.
Dependencies are inferred from the claim text.