Digital recording/reproducing system

• US 6,681,015 B1
• Filed: 04/28/1999
• Issued: 01/20/2004
• Est. Priority Date: 04/30/1998
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Hioki, Toshiaki, Matsuyama, Hisashi
• Primary Examiner(s): Darrow, Justin T.
• Application Number:
  US09/301,202
• Time in Patent Office: 1,728 Days
• Field of Search: 380/201, 380/202, 380/228, 380/230, 380/231, 380/279, 380/280, 705/52, 705/53, 705/54, 705/57, 705/58, 705/59, 705/71, 705/77, 705/78, 713/193
• US Class Current: 380/231
• 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 20/0071 involving a purchase action
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• 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 21/4181 for conditional access
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/42676 for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
• 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 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/47211 for requesting pay-per-view content payment schemes payment architectures or payment protocols G06Q20/00, G07F
• CPC Class Codes: H04N 21/6137 involving transmission via a telephone network, e.g. POTS
• CPC Class Codes: H04N 21/6187 involving transmission via a telephone network, e.g. POTS
• CPC Class Codes: H04N 21/63345 by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/163 : by receiver means only

Abstract

A digital recording/reproducing system includes a set top box. The STB receives a digital television broadcast signal and transmits a scrambled data stream from a stream selector via an interface to a digital recording/reproducing apparatus. In the data recording/reproducing apparatus, a scramble key is acquired depending on a billing request for data recording. To AS-MO disc are recorded a contents key converted from a disc unique ID using a descramble key as well as the data stream. In accordance with a user'"'"'s approval for the billing, an account table is created which is registered in an IC card and transmitted via a MODEM and telephone line.

Claims

1. A digital recording system having a digital data output apparatus to output scramble digital data and a digital recording apparatus, to record the digital data to a digital recording medium, wherein said digital recording medium includes previously recorded unique identification data, said digital recording system comprising:

a reading means for reading said unique identification data out of said data recording medium;

a key data creating means for creating key data based on said unique identification data read by said reading means and a descramble key for descrambling said scrambled digital data; and

a recording means for recording said the scrambled digital data and said key data to said digital recording medium.

3. A digital recording apparatus according to claim 1 or 2, further comprising:

a first approval getting means for getting an approval from a user on a billing for digital recording;

an account table creating means for creating an account table depending upon an approval of the billing by the user; and

a register means for registering the account table.

4. A digital recording system according to claim 3, further comprising an account table transmitting means for transmitting the account table to a billing control center.

5. A digital recording system according to claim 3, wherein said first approval getting means includes a condition notifying means for notifying the user a billing condition, and an input means for inputting whether the user approves the billing according to the billing condition or not.

6. A digital recording system according to claim 3, further comprising a descramble key providing means for providing the descramble key depending upon an approval of the billing by the user.

2. A digital recording system having a digital data output apparatus to output scramble digital data and a digital recording apparatus, to record the digital data to a digital recording medium, wherein said digital recording medium includes previously recorded unique identification data, said digital recording system comprising:

a reading means for reading said unique identification data out of said data recording medium;

a first key creating means for creating a first key based on said unique identification data read by said reading means;

a second key creating means for creating a second key based on said first key created by said first key data creating means and a descramble key for descrambling said scrambled digital data; and

a recording means for recording said scrambled digital data and said second key created by said second key creating means to said digital recording medium.

7. A digital reproducing system for reproducing scrambled digital data out of a digital recording medium, wherein said digital recording medium includes previously recorded unique identification data and key data, said digital reproducing system comprising:

a reading means for reading said unique identification data, said key data and said scrambled digital data out of said data recording medium;

a first key creating means for creating a first key based on said unique identification data read by said reading means;

a restoring means for restoring a descramble key based on said key data read by said reading means and said first key created by first key data creating means; and

a descrambling means for descrambling said scrambled digital data by said descramble key restored by said restoring means.

8. A method for reproducing digital data from a digital recording medium wherein scrambled digital data and key data are recorded on said digital recording medium having unique identification data previously recorded, said digital data reproducing method comprising the steps of:

(a) reading said unique identification data, key data and scrambled digital data out of said data recording medium;

(b) creating a first key based on said unique identification data read in said step (a);

(c) restoring a descramble key based on said key data read in said step (a) and the first key created in said step (b); and

(d) descrambling said scrambled digital data by said descramble key restored in said step (c).

9. A method for recording digital data to a digital recording medium wherein said digital recording medium includes previously recorded unique identification data, comprising the steps of:

(a) reading said unique identification data out of said data recording medium;

(b) creating a first key based on said unique identification data read in said step (a) and a descramble key for descrambling said digital data; and

(c) recording said scrambled digital data and said key data created in said step (b) to said digital recording medium.

10. A method for recording digital data to a digital recording medium, wherein said digital recording medium includes previously recorded unique identification data, comprising the steps of:

(a) reading said unique identification data out of said data recording medium;

(b) creating a first key based on said unique identification data read in said step (a);

(c) creating a second key based on said first key created in said step (b) and a descramble key for descrambling said scrambled digital data; and

(d) recording said scrambled digital data and said second key created in step (c) to said digital recording medium.