Apparatus and method for preventing unauthorized copying of video signals

• US 5,418,853 A
• Filed: 07/21/1993
• Issued: 05/23/1995
• Est. Priority Date: 07/24/1992
• Status: Expired

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Inoue, Hajime, Kanota, Keiji, Kubota, Yukio
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/094,433
• Time in Patent Office: 671 Days
• Field of Search: 380/3, 380/4, 380/5, 380/15, 380/20, 380/23, 380/49, 380/759, 358/349, 358/335, 358/339, 360/60, 348/5.5, 340/825.31, 340/825.34
• US Class Current: 380/203
• CPC Class Codes: G11B 15/087 by sensing recorded signals
• CPC Class Codes: G11B 17/28 the magazine having a cylindrical shape with horizontal axis
• 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 20/00188 involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
• CPC Class Codes: G11B 20/00195 using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• 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 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/031 Electronic editing of digitised analogue information signals, e.g. audio or video signals
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 33/12 Disposition of constructional parts in the apparatus, e.g. of power supply, of modules
• CPC Class Codes: G11B 33/121 the apparatus comprising a single recording/reproducing device
• CPC Class Codes: H04N 2005/91321 the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
• 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 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 5/9206 the additional signal being a character code signal
• CPC Class Codes: H04N 7/088 the inserted signal being digital
• CPC Class Codes: H04N 7/0887 : for the transmission of programme or channel identifying signals

Abstract

In a digital video tape recorder (VTR) which reproduces digital video and audio signals from a magnetic tape, a copy protect bit in the reproduced digital video signal is detected, and on the basis of the copy protect bit, a code is generated and inserted into the vertical blanking interval of the reproduced video signal. When a video signal (which may be in analog or digital form) having the code in the vertical blanking interval is received in a digital VTR, the code is detected and recording of the video signal and an associated audio signal is inhibited if the code indicates that the received video signal is copy protected.

Claims

1. A method of transmitting a video signal comprising the steps of:

forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;

combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval; and

transmitting said multiplexed video signal.

2. A method of transmitting a video signal according to claim 1;

wherein said multiplexed video signal is transmitted in the form of an analog signal.

3. A video recording apparatus comprising:

means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

means for receiving an audio signal associated with said multiplexed video signal;

means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;

means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted; and

means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted.

4. A video recording apparatus according to claim 3;

wherein said means for recording includes means for recording the received video and audio signals on a magnetic tape.

5. A video recording apparatus according to claim 3;

wherein the received video and audio signals are analog signals and further comprising means for converting said signals to digital video and audio signals, said digital signals being recorded by said means for recording.

6. A video recording apparatus according to claim 3;

wherein said means for inhibiting includes means for scrambling said video signal so that said means for recording records a scrambled video signal from which a video picture cannot be satisfactorily displayed.

7. A video recording apparatus according to claim 3;

wherein said means for inhibiting includes means for muting said audio signal so that said audio signal is not recorded.

8. A video recording apparatus according to claim 3;

further comprising;

means for reproducing a digital video signal from a magnetic tape;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal; and

means for outputting said multiplexed digital video signal.

9. A video recording apparatus according to claim 8;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal.

10. A video recording apparatus according to claim 8;

wherein said means for outputting said multiplexed digital video signal includes means for converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval thereof.

11. A video recording apparatus according to claim 3;

further comprising;

means for reproducing a digital video signal from a magnetic tape;

means for converting said reproduced digital video signal into an analog video signal;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said analog video signal; and

means for outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

12. A video recording apparatus according to claim 11;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal.

13. A method of transmitting a video signal comprising the steps of:

reproducing a digital video signal from a magnetic tape;

detecting a copy guard signal that is present in said reproduced digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal;

converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval of said analog video signal; and

transmitting said analog video signal.

14. A method of transmitting a video signal according to claim 13 wherein said reproduced digital video signal is a compressed digital video signal, and further comprising the step of expanding said compressed digital video signal, said ID signal being inserted into a vertical blanking interval of said expanded digital video signal.

15. A method of transmitting a video signal according to claim 13;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

16. A method of transmitting a video signal according to claim 15;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

17. A method of transmitting a video signal comprising the steps of:

reproducing a digital video signal from a magnetic tape;

converting said reproduced digital video signal into an analog video signal;

receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and detecting a copy guard signal that is present in said received digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said analog video signal; and

transmitting said analog video signal having said ID signal inserted in said vertical blanking period of said analog video signal.

18. A method of transmitting a video signal according to claim 17, wherein said reproduced digital video signal is a compressed digital video signal, and further comprising the step of expanding said compressed digital video signal before the same is converted into said analog video signal.

19. A method of transmitting a video signal according to claim 17;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

20. A method of transmitting a video signal according to claim 19;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

21. A video reproducing apparatus comprising:

means for reproducing a digital video signal from a magnetic tape;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal; and

means for outputting said multiplexed digital video signal.

23. A video reproducing apparatus according to claim 21;

wherein said means for outputting said multiplexed digital video signal includes means for converting said multiplexed digital signal into an analog video signal having said ID signal in a vertical blanking interval thereof.

24. A video reproducing apparatus according to claim 21;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

25. A video reproducing apparatus according to claim 24;

wherein said ID signal includes category information for identifying, a type of device from which said analog video signal is transmitted.

22. A video reproducing apparatus according to claim wherein said reproduced digital video signal is a compressed 21;

digital video signal, and further comprising means for expanding said compressed digital video signal.

26. A video reproducing apparatus comprising:

means for reproducing a digital video signal from a magnetic tape;

means for converting said reproduced digital video signal into an analog video signal;

means for receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and for detecting a copy guard signal that is present in said received digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said analog video signal; and

means for outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

27. A video reproducing apparatus according to claim 26;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal.

28. A video reproducing apparatus according to claim 26;

wherein said ID signal includes a copy protection bit for indicating whether said analog video signal is to be protected from copying.

29. A video reproducing apparatus according to claim 28;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

30. A video recording and reproducing apparatus comprising:

means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copyright protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

means for receiving an audio signal associated with said multiplexed video signal;

means for determining whether or not copying of said video signal is permitted based on said copyright protection bit and said category information;

means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted;

means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted;

means for reproducing a digital video signal from a recording medium;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal; and

means for outputting said multiplexed digital video signal.

31. A video recording and reproducing apparatus according to claim 30;

wherein said recording medium is a magnetic tape.

32. A video recording and reproducing apparatus according to claim 31;

wherein the received video and audio signals are analog signals and further comprising means for converting said signals to digital video and audio signals, said digital signals being recorded on said magnetic tape by said means for recording.

33. A video recording and reproducing apparatus according to claim 30;

wherein said recording medium is a first magnetic tape and the received video and audio signals are analog signals, and further comprising means for converting said signals to digital video and audio signals, said digital signals being recorded by said means for recording on a second magnetic tape.

34. A video recording and reproducing apparatus according to claim 33;

wherein said means for outputting said multiplexed digital video signal includes means for converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval thereof, and further comprising means interconnecting said means for outputting and said means for receiving, said received analog video and audio signals including the analog video signal output from said means for outputting, said digital code included in said received video signal being said ID signal generated by said means for generating.

35. A video recording and reproducing apparatus according to claim 30;

wherein said means for inhibiting includes means for scrambling said video signal so that said means for recording records a scrambled video signal from which a video picture cannot be satisfactorily displayed.

36. A video recording and reproducing apparatus according to claim 30;

wherein said means for inhibiting includes means for muting said audio signal so that said audio signal is not recorded.

37. A video recording and reproducing apparatus according to claim 30;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal.

38. A video recording and reproducing apparatus comprising:

means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

means for receiving an audio signal associated with said multiplexed video signal;

means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;

means for recording the received video and audio signals if it is determined by said means for determining that copying of said video signal is permitted;

means for inhibiting recording of at least one of said video signal and said audio signal if it is determined by said means for determining that copying of said video signal is not permitted;

means for reproducing a digital video signal from a recording medium;

means for converting said reproduced digital video signal into an analog video signal;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said analog video signal; and

means for outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

39. A video recording and reproducing apparatus according to claim 38;

wherein said recording medium is a magnetic tape.

40. A video recording and reproducing apparatus according to claim 39;

wherein the received video and audio signals are analog signals and further comprising means for converting said signals to digital video and audio signals, said digital signals being recorded on said magnetic tape by said means for recording.

41. A video recording and reproducing apparatus according to claim 38;

wherein said recording medium is a first magnetic tape and the received video and audio signals are analog signals, and further comprising means for converting said signals to digital video and audio signals, said digital signals being recorded by said means for recording on a second magnetic tape.

42. A video recording and reproducing apparatus according to claim 41;

further comprising means interconnecting said means for outputting and said means for receiving, and wherein said received analog video and audio signals include the analog video signal output from said means for outputting, said digital code included in said received video signal being said ID signal generated by said means for generating.

43. A video recording and reproducing apparatus according to claim 38;

wherein said means for inhibiting includes means for scrambling said video signal so that said means for recording records a scrambled video signal from which a video picture cannot be satisfactorily displayed.

44. A video recording and reproducing apparatus according to claim 38;

wherein said means for inhibiting includes means for muting said audio signal so that said audio signal is not recorded.

45. A video recording and reproducing apparatus according to claim 38;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal.

46. A method of recording a video signal comprising the steps of:

receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

receiving an audio signal associated with said multiplexed video signal;

determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;

recording the received video and audio signals if it is determined that copying of said video signal is permitted; and

inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted.

47. A method of recording a video signal according to claim 46;

wherein said recording step includes recording the received video and audio signals on a magnetic tape.

48. A method of recording a video signal according to claim 46;

wherein the received video and audio signals are analog signals and further comprising the step of converting said signals to digital video and audio signals, said recording step including recording said digital signals.

49. A method of recording a video signal according to claim 46;

wherein said inhibiting step includes scrambling said video signal so that said recorded video signal is a scrambled video signal from which a video picture cannot be satisfactorily displayed.

50. A method of recording a video signal according to claim 46;

wherein said inhibiting step includes muting said audio signal so that said audio signal is not recorded.

51. A method of reproducing a video signal comprising the steps of:

reproducing a digital video signal from a magnetic tape;

detecting a copy guard signal that is present in said reproduced digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal; and

outputting said multiplexed digital video signal.

52. A method of reproducing a video signal according to claim 51, wherein said reproduced digital video signal is a compressed digital video signal, and further comprising the step of expanding said compressed digital video signal.

53. A method of reproducing a video signal according to claim 51, wherein said outputting step includes converting said multiplexed digital signal into an analog video signal having said ID signal in a vertical blanking interval thereof.

54. A method of reproducing a video signal according to claim 51, wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

55. A method of reproducing a video signal according to claim 54;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

56. A method of reproducing a video signal comprising the steps of:

reproducing a digital video signal from a magnetic tape;

converting said reproduced digital video signal into an analog video signal;

receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and detecting a copy guard signal that is present in said received digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said analog video signal; and

outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

57. A method of reproducing a video signal according to claim 56, wherein said reproduced digital video signal is a compressed digital video signal, and further comprising the step of expanding said compressed digital video signal.

58. A method of reproducing a video signal according to claim 56, wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

59. A method of reproducing a video signal according to claim 58;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

60. A method of recording and reproducing a video signal, comprising the steps of:

receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

receiving an audio signal associated with said multiplexed video signal;

determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;

if it is determined that copying of said video signal is permitted, recording the received video and audio signals in digital form on a recording medium, said digital form including a copy guard signal;

inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted;

reproducing said digital video signal from said recording medium;

detecting said copy guard signal that is present in said reproduced digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video signal; and

outputting said multiplexed digital video signal.

61. A method of recording and reproducing a video signal according to claim 60;

wherein said recording medium is a magnetic tape.

62. A method of recording and reproducing a video signal according to claim 60;

wherein the received video and audio signals are analog signals and further comprising the step of converting said signals to digital video and audio signals.

63. A method of recording and reproducing a video signal according to claim 60;

wherein said inhibiting step includes scrambling said video signal so that said recorded video signal is a scrambled video signal from which a video picture cannot be satisfactorily displayed.

64. A method of recording and reproducing a video signal according to claim 60;

wherein said inhibiting step includes muting said audio signal so that said audio signal is not recorded.

65. A method of recording and reproducing a video signal according to claim 60;

wherein said digital video signal that is recorded on and reproduced from said recording medium is a compressed digital video signal, and further comprising the step of expanding said reproduced compressed digital video signal.

66. A method of recording and reproducing a video signal according to claim 60;

wherein said outputting step includes converting said multiplexed digital signal into an analog video signal having said ID signal in a vertical blanking interval thereof.

67. A method of recording and reproducing a video signal according to claim 60;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

68. A method of recording and reproducing a video signal according to claim 67;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

69. A method of recording and reproducing a video signal, comprising the steps of:

receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted;

receiving an audio signal associated with said multiplexed video signal;

determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information;

if it is determined that copying of said video signal is permitted, recording the received video and audio signals in digital form on a recording medium, said digital form including a copy guard signal;

inhibiting recording of at least one of said video signal and said audio signal if it is determined that copying of said video signal is not permitted;

reproducing said digital video signal from said recording medium;

converting said reproduced digital video signal into an analog video signal;

detecting said copy guard signal that is present in said reproduced digital video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking interval of said analog video signal; and

outputting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

70. A method of recording and reproducing a video signal according to claim 69;

wherein said recording medium is a magnetic tape.

71. A method of recording and reproducing a video signal according to claim 69;

wherein the received video and audio signals are analog signals and further comprising the step of converting said signals to digital video and audio signals.

72. A method of recording and reproducing a video signal according to claim 69;

wherein said inhibiting step includes scrambling said video signal so that said recorded video signal is a scrambled video signal from which a video picture cannot be satisfactorily displayed.

73. A method of recording and reproducing a video signal according to claim 69;

wherein said inhibiting step includes muting said audio signal so that said audio signal is not recorded.

74. A method of recording and reproducing a video signal according to claim 69;

wherein said digital video signal that is recorded on and reproduced from said recording medium is a compressed digital video signal, and further comprising the step of expanding said reproduced compressed digital video signal.

75. A method of recording and reproducing a video signal according to claim 69;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

76. A method of recording and reproducing a video signal according to claim 75;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

77. An apparatus for transmitting a video signal, comprising:

means for forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;

means for combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval; and

means for transmitting said multiplexed video signal.

78. An apparatus for transmitting a video signal according to claim 77;

wherein said multiplexed video signal is transmitted in the form of an analog signal.

79. An apparatus for transmitting a video signal, comprising:

means for reproducing a digital video signal from a magnetic tape;

means for detecting a copy guard signal that is present in said reproduced digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said reproduced digital video signal to form a multiplexed digital video

means for converting said multiplexed digital video signal into an analog video signal having said ID signal in a vertical blanking interval of said analog video signal; and

means for transmitting said analog video signal.

80. An apparatus for transmitting a video signal according to claim 79;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal, said ID signal being inserted into a vertical blanking interval of said expanded digital video signal.

81. An apparatus for transmitting a video signal according to claim 79;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

82. An apparatus for transmitting a video signal according to claim 81;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

83. An apparatus for transmitting a video signal, comprising:

means for reproducing a digital video signal from a magnetic tape;

means for converting said reproduced digital video signal into an analog video signal;

means for receiving said reproduced digital video signal before said reproduced digital video signal is converted into said analog video signal and for detecting a copy guard signal that is present in said received digital video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said analog video signal; and

means for transmitting said analog video signal having said ID signal inserted in said vertical blanking interval of said analog video signal.

84. An apparatus for transmitting a video signal according to claim 83;

wherein said reproduced digital video signal is a compressed digital video signal, and further comprising means for expanding said compressed digital video signal before the same is converted into said analog video signal.

85. An apparatus for transmitting a video signal according to claim 83;

wherein said ID signal includes a copy protection bit for indicating whether said multiplexed digital video signal is to be protected from copying.

86. An apparatus for transmitting a video signal according to claim 85;

wherein said ID signal includes category information for identifying a type of device from which said analog video signal is transmitted.

87. An apparatus for receiving a video signal, comprising:

means for receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted; and

means for determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information.

88. An apparatus for receiving a video signal according to claim 87;

wherein the received multiplexed video signal is an analog signal.

89. An apparatus for receiving a video signal, comprising:

means for receiving a video signal that includes a copy guard signal, said means for receiving including means selected from the group consisting of means for decoding a cable television signal, means for decoding a satellite broadcast television signal and means for receiving an over-the-air broadcast television signal;

means for detecting said copy guard signal included in said received video signal;

means for generating an ID signal in accordance with the detected copy guard signal;

means for inserting said ID signal into a vertical blanking interval of said received video signal to form a multiplexed video signal; and

means for outputting said multiplexed video signal.

90. An apparatus for receiving a video signal according to claim 89;

wherein said received video signal is a digital video signal.

91. An apparatus for receiving a video signal according to claim 89;

wherein said means for outputting outputs said multiplexed video signal in analog form.

92. An apparatus for transmitting and receiving a video signal, comprising:

means for forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;

means for combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;

means for transmitting said multiplexed video signal;

means for receiving said multiplexed video signal which was transmitted by said means for transmitting; and

means for determining whether or not copying of said received video signal is permitted based on said copy protection bit and said category information contained in said vertical blanking interval of said received video signal.

93. An apparatus for transmitting and receiving a video signal according to claim 92;

wherein said multiplexed video signal is transmitted and received in the form of an analog signal.

94. A method of receiving a video signal comprising the steps of:

receiving a multiplexed video signal having a vertical blanking interval that includes a digital code containing at least a copy protection bit and category information for identifying a type of equipment from which the multiplexed video signal was transmitted; and

determining whether or not copying of said video signal is permitted based on said copy protection bit and said category information.

95. A method of receiving a video signal according to claim 94;

wherein the received multiplexed video signal is an analog signal.

96. A method of receiving a video signal comprising the steps of:

receiving a video signal that includes a copy guard signal, said receiving step including a step selected from the group consisting of decoding a cable television signal, decoding a satellite broadcast television signal, and receiving an over-the-air broadcast television signal;

detecting said copy guard signal included in said received video signal;

generating an ID signal in accordance with the detected copy guard signal;

inserting said ID signal into a vertical blanking period of said received video signal to form a multiplexed video signal; and

outputting said multiplexed video signal.

97. A method of receiving a video signal according to claim 96;

wherein said received video signal is a digital video signal.

98. A method of receiving a video signal according to claim 96;

wherein said output multiplexed video signal is an analog signal.

99. A method of transmitting and receiving a video signal comprising the steps of:

forming a digital code that includes at least a copy protection bit and category information which identifies a type of device from which the video signal is transmitted;

combining said digital code with a video signal having a vertical blanking interval to form a multiplexed video signal having said digital code in said vertical blanking interval;

transmitting said multiplexed video signal;

receiving said transmitted multiplexed video signal; and

determining whether or not copying of said received video signal is permitted based on said copy protection bit and said category information contained in said vertical blanking interval of said received video signal.

100. A method of transmitting and receiving a video signal according to claim 99;

wherein said multiplexed video signal is transmitted and received in the form of an analog signal.