Method for appending a signal with ciphered playback mode information

• US 6,009,170 A
• Filed: 08/08/1996
• Issued: 12/28/1999
• Est. Priority Date: 08/11/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Osawa, Yoshitomo, Sako, Yoichiro, Kurihara, Akira, Kawashima, Isao, Yoneyama, Shigeyuki
• Primary Examiner(s): Patel, Harshad
• Assistant Examiner(s): CLARK, ROBIN C
• Application Number:
  US08/694,327
• Time in Patent Office: 1,237 Days
• Field of Search: 380/3, 380/4, 380/5, 380/10, 380/21, 380/28, 380/22, 360/60, 360/27, 360/15
• US Class Current: 380/201
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• 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 20/00224 wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/00253 wherein the key is stored on the 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 20/0071 involving a purchase action
• 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

Abstract

A signal transmission method applicable to prevention of modification or alteration of the playback mode information, such as copying management information or charging information. The playback mode information form a terminal 15P is data-converted for ciphering by a playback mode information appendage circuit 14 in a header appendage circuit 13 responsive to the key information from a terminal 15K and the resulting information comprised of the data and the playback mode information is outputted. The reproducing side effects data conversion on the ciphered playback mode information for deciphering, by a playback mode information detection circuit 26 in a header separation circuit 25, using the key information from a terminal 27K, for taking out the original playback mode information at a terminal 27P.

Claims

1. A signal appending method comprising:

data-converting playback mode information in accordance with ciphering key information and address data that indicates an address on a signal storage medium; and

appending a signal with the data-converted playback mode information.

2. The method as claimed in claim 1 wherein said playback mode information includes at least one of copying management information and charging information.

3. The method as claimed in claim 1 wherein said data-converting is performed by logical operations of the data of the playback mode information, the ciphering key information, and the address data.

4. The method as claimed in claim 1 wherein said playback mode information is arranged at a predetermined address on the signal storage medium.

7. The method as claimed in claim 1 wherein said address data is at least a portion of a sector address of the signal storage medium.

8. The method as claimed in claim 7 wherein said address data consists of a portion a sector address of the signal storage medium.

9. The method as claimed in claim 1, further comprising recording said signal with the appended, ciphered playback mode information on a storage medium.

10. The method as claimed in claim 1, further comprising transmitting said signal with the appended, ciphered playback information on a communication transmission medium.

5. A method of appending playback mode information to a video signal, comprising:

providing a video signal, ciphering key information, and playback mode information;

ciphering the playback mode information in accordance with the ciphering key information; and

appending the ciphered playback mode information to the video signal at a position corresponding to a vertical blanking period of the video signal.

6. The method as claimed in claim 5, wherein said playback mode information includes at least one of copying management information and charging information.

11. A signal record medium comprising:

an area having a video signal recorded thereon; and

a region having recorded thereon ciphered playback mode information comprising playback mode information ciphered with ciphering key information;

wherein said ciphered playback mode information is recorded as part of a vertical blanking period portion of the video signal, to enable reproduction of the ciphered playback mode information during the vertical blanking period of the video signal.

12. The signal record medium as claimed in claim 11 wherein said playback mode information includes at least one of copying management information and charging information.

13. The video signal record medium as claimed in claim 11, wherein said ciphered playback mode information includes copy management information ciphered with the ciphering key information.

14. The signal record medium as claimed in claim 11, wherein the region having recorded ciphered playback mode information is a lead-in area of the record medium.

15. A video signal reproducing apparatus for reproducing an analog video signal, the apparatus comprising:

reproducing means for reproducing data from a lead-in area, a program area and a lead-out area of a recording medium, said reproduced data including data corresponding to an analog video signal with ciphered playback mode information appended in a vertical blanking period portion thereof; and

outputting means for deriving the analog video signal from the reproduced data and outputting the analog video signal, said outputting means including;

key information entry means for entering key information for deciphering said ciphered playback mode information; and

means for effecting data conversion for said deciphering responsive to the key information from said key information entry means.

16. The signal reproducing apparatus as claimed in claim 15, wherein said ciphered playback mode information includes at least one of copy management information and charging information.