Recording apparatus and method, reproducing apparatus and method, and memory medium

• US 7,448,086 B2
• Filed: 11/02/2001
• Issued: 11/04/2008
• Est. Priority Date: 11/06/2000
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sako, Yoichiro, Furukawa, Shunsuke, Inokuchi, Tatsuya, Kihara, Takashi
• Primary Examiner(s): Laforgia; Christian
• Assistant Examiner(s): SHAW, YIN CHEN
• Application Number:
  US10/169,695
• Publication Number:
  US 20030012375A1
• Time in Patent Office: 2,559 Days
• Field of Search: 713/189, 713/193, 380/277, 380/200, 380/228, 380/230, 369/275.3, 369/47.12, 369/84, 726 26- 27, 726/31, 726/30, 361/26.01, 361/47.1, 361/47.12
• US Class Current: 726/27
• 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 20/00202 wherein the copy protection scheme builds on multi-session recording, e.g. defective table of contents [TOC] in the 2nd session
• 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 20/00304 the key being stored in the lead-in area [LIA]
• CPC Class Codes: G11B 20/00311 the key being stored in the lead-out area [LOA]
• CPC Class Codes: G11B 20/00449 content scrambling system [CSS]
• CPC Class Codes: G11B 20/00521 wherein each session of a multisession recording medium is encrypted with a separate encryption key
• CPC Class Codes: G11B 20/0063 wherein the modification to the logical format mainly concerns management data, e.g., by changing the format of the TOC or the subcode
• CPC Class Codes: G11B 20/00746 wherein the usage restriction can be expressed as a specific number
• 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 20/00797 wherein the usage restriction limits the number of times a content can be reproduced, e.g. using playback counters
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/12 Formatting, e.g. arrangement of data block or words on the record carriers within interface between computers and data recorders G06F3/06
• CPC Class Codes: G11B 20/1217 on discs

Abstract

Data areas AR1 and AR2, lead-in areas LIN1 and LIN2, and lead-out areas LOUT1 and LOUT2 are provided on a disc. For example, in case of encrypting and recording data into the data area AR2, copyright management information R2 and key information K2 are recorded into the lead-out area LOUT2. Only information in a Q channel of a subcode is recorded in the lead-out area and this area is filled with dummy data. A position of the lead-out is obtained from TOC information. The fact that a light spot has entered the lead-out area can be judged from the information in the Q channel. The copyright management information and key information are recorded by using the lead-out area. The lead-out area is not rewritten or accessed by an ordinary CD player, so that the copyright management information and the key information can be safely held.

Claims

1. A recording apparatus for recording data on a memory medium comprising a plurality of data areas for recording content data, a plurality of lead-in areas, and a plurality of lead-out areas, the recording apparatus comprising:

an input terminal for inputting encrypted content data; and

an optical pickup for,

recording first encrypted content data into a first data area on said memory medium,

recording a first part of a first decrypting key for decrypting said first encrypted content data and a first part of first copyright management information for restricting reproduction/copy of said first encrypted content data into a first lead-in area on an inner rim side of said first data area,

recording a second part of the first decrypting key and a second part of the first copyright management information into a first lead-out area on an outer rim side of said first data area,

recording second encrypted content data into a second data area on said memory medium,

recording a first part of a second decrypting key for decrypting said second encrypted content data and a first part of second copyright management information for restricting reproduction/copy of said second encrypted content data into a first lead-in area on an inner rim side of said second data area, and

recording a second part of the second decrypting key and a second part of the second copyright management information into a first lead-out area on an outer rim side of said second data area;

wherein

the data areas are positioned relative to one another on said memory medium in a radial direction.

4. A recording apparatus according to claim 1, wherein the first copyright management information and the second copyright management information manage one or more of copy inhibition or permission, generation of the copy, restriction of the number of copies, reproduction inhibition or permission, restriction of the number of reproducing times, and a restriction of a reproducing time for the first encrypted content data and the second encrypted content data.

2. A reproducing apparatus for reproducing data from a memory medium comprising a plurality of data areas for recording content data, a plurality of lead-in areas, and a plurality of lead-out areas, the reproducing apparatus comprising:

an optical pickup for,

reading out first encrypted content data from a first data area on said memory medium,

reading out a first part of a first decrypting key for decrypting said encrypted content data and a first part of first copyright management information for restricting reproduction/copy of said encrypted content data from a first lead-in area on an inner rim side of said first data area,

reading out a second part of the first decrypting key and a second part of the first copyright management information from a first lead-out area on an outer rim side of said first data area,

reading out second encrypted content data from a second data area on said memory medium,

reading out a first part of a second decrypting key for decrypting said second encrypted content data and a first part of second copyright management information for restricting reproduction/copy of said second encrypted content data from a first lead-in area on an inner rim side of said second data area, and

reading out a second part of the second decrypting key and a second part of the second copyright management information from a first lead-out area on an outer rim side of said second data area; and

a reproducing circuit for reproducing said first encrypted content data in accordance with said read-out first decrypting key and first copyright management information and for reproducing said second encrypted content data in accordance with said read-out second decrypting key and second copyright management information;

wherein

the plurality of data areas are positioned relative to one another on said memory medium in a radial direction.

5. A reproducing apparatus according to claim 2, wherein the first copyright management information and the second copyright management information manage one or more of copy inhibition or permission, generation of the copy, restriction of the number of copies, reproduction inhibition or permission, restriction of the number of reproducing times, and a restriction of a reproducing time for the first encrypted content data and the second encrypted content data.

3. A reproducing method for reproducing data from a memory medium comprising a plurality of data areas for recording content data, a plurality of lead-in areas, and a plurality of lead-out areas, the reproducing method comprising:

reading out first encrypted content data from a first data area on the memory medium;

reading out a first part of a first decrypting key for decrypting said first encrypted content data and a first part of first copyright management information for restricting reproduction/copy of said first encrypted content data from a first lead-in area on an inner rim side of said first data area;

reading out a second part of the first decrypting key and a second part of the first copyright management information from a first lead-out area on an outer rim side of said first data area;

reading out second encrypted content data from a second data area on the memory medium,

reading out a first part of a second decrypting key for decrypting said second encrypted content data and a first part of second copyright management information for restricting reproduction/copy of said second encrypted content data from a first lead-in area on an inner rim side of said second data area,

reading out a second part of the second decrypting key and a second part of the second copyright management information from a first lead-out area on an outer rim side of said second data area; and

reproducing said first encrypted content data in accordance with the first decrypting key and first copyright management information read out from the first lead-in area and the second lead-out area and reproducing the second encrypted content data in accordance with the second decrypting key and second copyright management information read out from the second lead-in area and the second lead-out area;

wherein

the plurality of data areas are positioned relative to one another on said memory medium in a radial direction.

6. A reproducing method according to claim 3, wherein the first copyright management information and the second copyright management information manage one or more of copy inhibition or permission, generation of the copy, restriction of the number of copies, reproduction inhibition or permission, restriction of the number of reproducing times, and a restriction of a reproducing time for the first encrypted content data and the second encrypted content data.