Digital information recording apparatus for recording digital information

• US 6,453,304 B1
• Filed: 12/01/1998
• Issued: 09/17/2002
• Est. Priority Date: 12/15/1997
• Status: Expired due to Term

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Shigeru, Hirahata, Manabu, Sasamoto, Takaharu, Noguchi, Makoto, Aikawa
• Primary Examiner(s): Coggins, Wynn
• Assistant Examiner(s): ROSEN, NICHOLAS D
• Application Number:
  US09/201,757
• Time in Patent Office: 1,386 Days
• Field of Search: 705/51, 705/57, 705/58, 380/201, 380/203
• US Class Current: 705/57
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00507 wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: H04N 2005/91328 the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/4135 external recorder interface circuits between an apparatus for recording television signals and a television receiver H04N5/775
• CPC Class Codes: H04N 21/8355 involving usage data, e.g. number of copies or viewings allowed
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• 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
• CPC Class Codes: H04N 9/804 involving pulse code modulation of the colour picture signal components
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

A digital information recording apparatus to record digital information to protect copyright of digital information that includes at least first digital information and first copy control information. The digital information recording apparatus records the digital information based upon the first copy control information, which denotes one of: a copy inhibition prohibiting copying of said first digital information; a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and an unlimited copy permission authorizing unlimited copying of said first digital information.

Claims

1. A digital information recording apparatus for recording a digital information, comprising:

separation means for separating first digital information and first copy control information from an inputted digital information signal including at least said first digital information and said first copy control information;

decrypt means for decrypting said first digital information outputted from said separation means to produce decrypted second digital information;

select means for selecting one of said first digital information and said decrypted second digital information from said decrypt means;

recording means for recording a selected one of said first digital information and said decrypted second digital information received from said select means; and

control means for controlling at least said select means and said recording means in response to said first copy control information received from said separation means.

2. A digital information recording apparatus according to claim 1, wherein:

said control means controls said decrypt means, said select means and said recording means in response to first copy control information outputted from said separation means.

3. A digital information recording apparatus according to claim 1, wherein:

said control means controls said separation means, said select means and said recording means in response to first copy control information outputted from said separation means.

4. A digital information recording apparatus according to claim 1, wherein:

said control means controls said separation means, said decrypt means, said select means and said recording means in response to first copy control information outputted from said separation means.

5. A digital information recording apparatus according to claim 1, wherein:

said first digital information includes at least one of encrypted information and non-encrypted information.

6. A digital information recording apparatus according to claim 1, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

7. A digital information recording apparatus according to claim 1, wherein:

said control means controls said select means so as to select said first digital information outputted from said separation means in response to said unlimited copy permission authorizing unlimited copying of said first digital information; and

said control means controls said select means so as to select said decrypted second digital information outputted from said decrypt means in response to said limited copy permission authorizing a predetermined number of times of copying of said first digital information.

8. A digital information recording apparatus according to claim 1, further comprising:

altering means for altering said first copy control information into second copy control information in response to said first copy control information;

wherein said control means controls said recording means so as to record a selected one of said first digital information and said decrypted second digital information as well as said second copy control information.

9. A digital information recording apparatus according to claim 8, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

10. A digital information recording apparatus according to claim 9, wherein:

said altering means, upon reaching said predetermined number of times of copying, alters said limited copy permission authorizing a predetermined number of times of copying of said first digital information into said copy inhibition of said first digital information as said second copy control information in response to said first copy control information.

11. A digital information recording apparatus according to claim 1, further comprising:

altering means for altering said first copy control information into second copy control information in response to said first copy control information;

wherein said control means controls said recording means so as to record said second digital information as well as said second copy control information.

12. A digital information recording apparatus according to claim 11, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

13. A digital information recording apparatus according to claim 12, wherein:

said altering means, upon reaching said predetermined number of times of copying, alters said limited copy permission authorizing a predetermined number of times of copying of said first digital information into said copy inhibition of said first digital information as said second copy control information in response to said first copy control information.

14. A digital information recording apparatus having a digital information output means, said digital information recording apparatus comprising:

separation means for separating first digital information and first copy control information from a digital information signal, including at least said first digital information and said first copy control information, outputted from said digital information receiving means;

decrypt means for decrypting said first digital information outputted from said separation means to produce decrypted second digital information;

select means for selecting said first digital information or said decrypted second digital information outputted from said decrypt means;

recording means for recording selected one of said first digital information and said decrypted second digital information; and

control means for controlling at least said select means and said recording means in response to said first copy control information received from said separation means.

15. A digital information recording apparatus according to claim 14, wherein:

said control means controls said decrypt means, said select means and said recording means in response to said first copy control information outputted from said separation means.

16. A digital information recording apparatus according to claim 14, wherein:

said control means controls said separation means, said select means and said recording means in response to said first copy control information outputted from said separation means.

17. A digital information recording apparatus according to claim 14, wherein:

said control means controls said separation means, said decrypt means, said select means and said recording means in response to said first copy control information outputted from said separation means.

18. A digital information recording apparatus according to claim 14, wherein:

said first digital information includes at least one of encrypted information and non-encrypted information.

19. A digital information recording apparatus according to claim 14, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

20. A digital information recording apparatus according to claim 14, wherein:

said control means controls said select means so as to select said first digital information outputted from said separation means in response to said unlimited copy permission authorizing unlimited copying of said first digital information; and

said control means controls said select means so as to select said decrypted second digital information outputted from said decrypt means in response to said limited copy permission authorizing a predetermined number of times of copying of said first digital information.

21. A digital information recording apparatus according to claim 14, further comprising:

altering means for altering said first copy control information into second copy control information in response to said first copy control information;

wherein said control means controls said recording means so as to record a selected one of said first digital information and said decrypted second digital information as well as said second copy control information.

22. A digital information recording apparatus according to claim 21, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

23. A digital information recording apparatus according to claim 22, wherein:

said altering means, upon reaching said predetermined number of times of copying, alters said limited copy permission authorizing a predetermined number of times of copying of said first digital information into said copy inhibition of said first digital information as said second copy control information in response to said first copy control information.

24. A digital information recording apparatus to record a digital information, comprising:

a digital interface circuit to separate first digital information and first copy control information from an inputted digital information signal, including at least said first digital information and said first copy control information;

a decryptor to decrypt said first digital information outputted from said digital interface circuit so as to produce decrypted second digital information;

a selector to select one of said first digital information and decrypted second digital information outputted from decryptor;

a recorder to record a selected one of said first digital information and said decrypted second digital information received from said selector; and

a controller to control at least said selector and said recorder in response to said first copy control information received from said digital interface circuit.

25. A digital information recording apparatus according to claim 24, wherein:

said controller controls said decryptor, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

26. A digital information recording apparatus according to claim 24, wherein:

said controller controls said digital interface circuit, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

27. A digital information recording apparatus according to claim 24, wherein:

said controller controls said digital interface circuit, said decryptor, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

28. A digital information recording apparatus according to claim 24, wherein:

said first digital information includes at least one of encrypted information and non-encrypted information.

29. A digital information recording apparatus according to claim 24, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

30. A digital information recording apparatus according to claim 24, wherein:

said controller controls said selector so as to select said first digital information outputted from said digital interface circuit in response to said unlimited copy permission authorizing unlimited copying of said first digital information; and

said controller controls said selector so as to select said decrypted second digital information outputted from said decryptor in response to said limited copy permission authorizing a predetermined number of times of copying of said first digital information.

31. A digital information recording apparatus according to claim 24, further comprising:

a copy modifier adapted to modify said first copy control information into second copy control information in response to said first copy control information;

wherein said controller controls said recorder so as to record a selected one of said first digital information and said decrypted second digital information as well as said second copy control information.

32. A digital information recording apparatus according to claim 31, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

33. A digital information recording apparatus according to claim 32, wherein:

said copy modifier, upon reaching said predetermined number of times of copying, modifies said limited copy permission authorizing a predetermined number of times of copying of said first digital information into said copy inhibition of said first digital information as said second copy control information in response to said first copy control information.

34. A digital information recording apparatus having a digital information receiver, said digital information recording apparatus comprising:

a digital interface circuit to separate first digital information and first copy control information from a digital information signal, including at least said first digital information and said first copy control information, outputted from said digital information receiver;

a decryptor to decrypt said first digital information outputted from said digital interface circuit so as to produce decrypted second digital information;

a selector to select said first digital information or said decrypted second digital information outputted from said decryptor;

a recorder to record a selected one of said first digital information and said decrypted second digital information; and

a controller to control at least said digital interface circuit and said recorder in response to said first copy control information outputted from said digital interface circuit.

35. A digital information recording apparatus according to claim 34, wherein:

said controller controls said decryptor, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

36. A digital information recording apparatus according to claim 34, wherein:

said controller controls said digital interface circuit, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

37. A digital information recording apparatus according to claim 34, wherein:

said controller controls said digital interface circuit, said decryptor, said selector and said recorder in response to said first copy control information outputted from said digital interface circuit.

38. A digital information recording apparatus according to claim 34, wherein:

said first digital information includes at least one of encrypted information and non-encrypted information.

39. A digital information recording apparatus according to claim 34, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

40. A digital information recording apparatus according to claim 34, wherein:

said controller controls said digital interface circuit so as to select said first digital information outputted from said digital interface circuit in response to said unlimited copy permission authorizing unlimited copying of said first digital information; and

said controller controls said digital interface circuit so as to select said decrypted second digital information outputted from said decryptor in response to said limited copy permission authorizing a predetermined number of times of copying of said first digital information.

41. A digital information recording apparatus according to claim 34, further comprising:

a copy modifier to modify said first copy control information into second copy control information in response to said first copy control information;

wherein said controller controls said recorder so as to record a selected one of said first digital information and said decrypted second digital information as well as said second copy control information.

42. A digital Information recording apparatus according to claim 41, wherein:

said first copy control information denotes one of;

a copy inhibition prohibiting copying of said first digital information;

a limited copy permission authorizing a predetermined number of times of copying of said first digital information; and

an unlimited copy permission authorizing unlimited copying of said first digital information.

43. A digital information recording apparatus according to claim 42, wherein:

said copy modifier, upon reaching said predetermined number of times of copying, modifies said limited copy permission authorizing a predetermined number of times of copying of said first digital information into said copy inhibition of said first digital information as said second copy control information in response to said first copy control information.