Recording and reproducing apparatus

• US 8,019,198 B2
• Filed: 11/08/2005
• Issued: 09/13/2011
• Est. Priority Date: 11/30/2004
• Status: Expired due to Fees

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ohgose, Hideyuki, Tsuda, Kenjiro, Saigo, Katsuo, Shimazaki, Hiroaki
• Primary Examiner(s): Chevalier; Robert
• Application Number:
  US11/664,414
• Publication Number:
  US 20080279532A1
• Time in Patent Office: 2,135 Days
• Field of Search: 386/252, 386/253, 386/254, 386/257, 386/263
• US Class Current: 386/252
• 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 20/00492 wherein content or user data is encrypted
• CPC Class Codes: G11B 20/00666 involving a step of erasing or nullifying data, e.g. data being overwritten with a random string
• CPC Class Codes: G11B 20/00688 said measures preventing that a usable copy of recorded data can be made on another medium
• 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 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 2020/00072 the compressed signal including a video signal
• CPC Class Codes: G11B 2020/10537 Audio or video recording
• CPC Class Codes: G11B 2020/10546 specifically adapted for audio data
• CPC Class Codes: G11B 2020/1288 Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
• CPC Class Codes: G11B 2220/2541 Blu-ray discs; Blue laser DVR discs
• CPC Class Codes: G11B 2220/60 Solid state media details of solid state memory devices G11C

Abstract

To provide a recording and reproducing apparatus that recovers contents having approximately the same quality as the original contents in a short time and requiring only light processing load, at the time of (a) moving the contents from the first recording medium to the second recording medium, (b) rewriting the contents in order to disable reproduction of the contents, (c) reconstructing the original contents by recovering the contents from the second recording medium to the first recording medium. The recording and reproducing apparatus includes a move processing unit 72a and a recovery processing unit 73a. The former records reconstruction information on the second recording medium in association with the second contents, the reconstruction information being used in reconstructing one or more parts of the contents that have been rewritten in order to disable reproduction of the contents at the time of moving the contents. Also, the latter reconstructs the original contents based on the remaining contents recorded on the first recording medium by recovering the reconstruction information from the second recording medium and using the reconstruction information.

Claims

1. A recording and reproducing apparatus comprising:

a first recording medium slot for receiving a first recording medium in which a first content is stored;

a second recording medium slot for receiving a second recording medium;

a receiving unit configured to receive a second content that is based on original data that is at least part of the first content;

a data modifying unit configured, when the received second content is recorded in a second recording medium, to delete at least part of the original data stored in said first recording medium or rewrite said at least part of the original data into other data, so as to disable reproduction of the original data;

an output unit configured to record reconstruction information in the second recording medium in association with the second content, the reconstruction information relating to the deleted or rewritten data; and

a recovery unit configured, when the reconstruction information is received from the second recording medium, to recover the original data recorded in said first recording medium according to the reconstruction information so as to enable the reproduction of the original data,

wherein;

the first content is a content coded according to a coding method in which inter frame referencing is performed, and

said data modifying unit is configured to (i) delete one of a reference image and header information of the reference image or (ii) rewrite said one of the reference image and the header information of the reference image into other data, the reference image being used when an image included in the original data is reproduced.

2. The recording and reproducing apparatus according to claim 1, wherein the reference image and the header information are included in the original data.

3. A recording and reproducing apparatus comprising:

a first recording medium slot for receiving a first recording medium in which a first content is stored;

a second recording medium slot for receiving a second recording medium;

a receiving unit configured to receive a second content that is based on original data that is at least part of the first content;

a data modifying unit configured, when the received second content is recorded in a second recording medium, to delete at least part of the original data stored in said first recording medium or rewrite said at least part of the original data into other data, so as to disable reproduction of the original data;

an output unit configured to record reconstruction information in the second recording medium in association with the second content, the reconstruction information relating to the deleted or rewritten data; and

a recovery unit configured, when the reconstruction information is received from the second recording medium, to recover the original data recorded in said first recording medium according to the reconstruction information so as to enable the reproduction of the original data,

wherein the reconstruction information includes address table information associating (i) the data deleted or rewritten into the other data by said data modifying unit and (ii) recording position information indicating a position of the deleted or rewritten data recorded in said first recording medium.

4. The recording and reproducing apparatus according to claim 3, wherein the address table information is generated based on table information specified in said first recording medium, for use in a reproduction mode different from a normal reproduction mode.