Digital signal transmitting method, digital signal receiving apparatus, and recording medium and method

• US RE38,236 E1
• Filed: 02/23/2000
• Issued: 08/26/2003
• Est. Priority Date: 10/28/1994
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Goto, Koichi, Kubota, Yukio
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US09/511,672
• Time in Patent Office: 1,280 Days
• Field of Search: 380/45, 380/47
• US Class Current: 380/45
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/23473 by pre-encrypting
• CPC Class Codes: H04N 21/2351 involving encryption of additional data arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/4331 Caching operations, e.g. of an advertisement for later insertion during playback
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/4353 involving decryption of additional data arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/454 Content or additional data filtering, e.g. blocking advertisements
• CPC Class Codes: H04N 21/8166 involving executable data, e.g. software arrangements for executing specific programs G06F9/44; broadcasting computer programmes in broadcast systems H04H20/91; involving the movement of software or configuration parameters H04L67/34
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

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.

Claims

1. 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.

2. The method according to claim 1, wherein the band-compression coded first digital signal is encrypted with a first encryption key, and the multiplexed first and second digital signals are encrypted with a second encryption key.

3. 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.

4. Apparatus according to claim 3, wherein the band-compression coded first digital signal is encrypted with a first encryption key, and the multiplexed first and second digital signals are encrypted with a second encryption key.

5. 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.

6. Apparatus according to claim 5, wherein said broadcasting station comprises means for multiplexing said first digital signal and said second digital signal having a predetermined image band-compression coded, and means for encrypting the multiplexed first and second digital signals.

7. Apparatus according to claim 5, wherein during variable speed reproduction, and recording/reproducing means reproduces a variable-speed reproduction image defined by said digital video signal.

8. Apparatus according to claim 5, further comprising means for providing access to a plurality of management stations forming a billing system for processing billing information corresponding to predetermined services supplied by said digital video signal.

9. 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.

10. A method for transmitting a digital transmission signal, comprising the steps of:

11. The method according to claim 10, further comprising:

12. The method according to claim 10, wherein

13. A method for transmitting a digital transmission signal, comprising the steps of:

14. A method for transmitting a digital transmission signal, comprising the steps of:

15. A method for transmitting a digital transmission signal, comprising the steps of:

16. Digital transmission apparatus for transmitting a digital transmission signal, comprising:

17. 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:

18. 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:

19. A method of transmitting a digital signal, the method comprising the steps of:

20. The method according to claim 19, further comprising:

encrypting said second encryption key (Ks);

wherein said multiplexing step multiplexes said first digital signal, second digital signal and said encrypted second encryption key (E(Ks)).

21. The method according to claim 19, further comprising:

encrypting said first encryption key (Km);

wherein said transmitting step transmits said encrypted first encryption key (E(Km)) to said receiver.

22. The method according to claim 19, wherein said receiving step receives said inquiry via telephone line.

23. The method according to claim 22, wherein said transmitting step transmits said first encryption key (Km) via telephone line.

24. Apparatus for transmitting a digital signal, the apparatus comprising:

25. Apparatus according to claim 24, further comprising:

means for encrypting said second encryption key (Ks);

wherein said multiplexing means multiplexes said first digital signal, second digital signal and said encrypted second encryption key (E(Ks)).

26. Apparatus according to claim 24, further comprising:

means for encrypting said first encryption key (Km);

wherein said transmitting means transmits said encrypted first encryption key (E(Km)) to said receiver.

27. Apparatus according to claim 24, wherein said receiving means receives said inquiry via telephone line.

28. Apparatus according to claim 27, wherein said transmitting means transmits said first encryption key (Km) via telephone line.