REPRODUCING APPARATUS, RECORDING APPARATUS AND DISPLAY APPARATUS

• US 20110064227A1
• Filed: 07/21/2010
• Published: 03/17/2011
• Est. Priority Date: 04/14/1998
• Status: Active Grant

• Current Assignee: Hitachi Consumer Electronics Company Limited (Hitachi, Ltd.)
• Original Assignee: Hiroshi Yoshiura, Hiroyuki Kimura, Osamu Kawamae, Takao Arai, Toshifumi Takeuchi
• Inventors: Yoshiura, Hiroshi, Takeuchi, Toshifumi, Arai, Takao, Kimura, Hiroyuki, Kawamae, Osamu
• Granted Patent: US 8,074,071 B2
• Time in Patent Office: Days
• US Class Current: 380/287
• 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 20/00224 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 20/00449 content scrambling system [CSS]
• CPC Class Codes: G11B 20/00739 wherein the usage restriction is associated with a specific geographical region
• 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 20/00884 involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04L 2209/603 Digital right managament [DRM]
• CPC Class Codes: H04L 9/32 including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
• 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 2005/91335 the copy protection signal being a watermark
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/4367 Establishing a secure communication between the client and a peripheral device or smart card
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/77 : between a recording apparatus and a television camera
• CPC Class Codes: H04N 5/775 : between a recording apparatus and a television receiver
• 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 9/8042 : involving data reduction

Abstract

A system effecting a data reproducing method for a plurality of devices, for sending and receiving data by authenticating the plurality of devices with each other, said data reproducing method including: selecting, from a plurality of descrambling methods, a descrambling method corresponding to a type of said data, executing authentication by an authenticating method corresponding to the selected descrambling method, where the authenticating method is selected from a plurality of authenticating methods, and reproducing said data.

Claims

1. (canceled)

2. An authentication method for use in sending/receiving data between a coded data output apparatus for outputting coded data having a water mark, and a recording apparatus for recording data onto a recording medium, the method comprising:

deciding a type of the recording medium used by the recording apparatus;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium, and conducting authentication between the coded data output apparatus and the recording apparatus, using the authentication method;

sending/receiving data between the coded data output apparatus and the recording apparatus after conducting the authentication; and

in a case where the coded data has the water mark, detecting the water mark by the coded data output apparatus, wherein the data exchanged between the coded data output apparatus and the recording apparatus is scrambled by a scrambling method corresponding to the type the recording medium.

3. A recording method for recording coded data outputted from a coded data output apparatus onto a recording medium by a recording apparatus, comprising:

deciding a type of the recording medium;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium;

conducting authentication between the coded data output apparatus and the recording apparatus in accordance with the authentication method selected;

in the case where a water mark is included in the coded data, detecting the water mark; and

outputting data from the coded data output apparatus to the recording apparatus, wherein the data exchanged between the coded data output apparatus and the recording apparatus is scrambled by a scrambling method corresponding to the type the recording medium.

4. An authentication method for conducting authentication between a reproducing apparatus for reproducing and outputting data recoded on a recording medium and a decoding apparatus for decoding the data outputted from the reproducing apparatus, comprising:

deciding a type of the recording medium;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium, and conducting authentication between the coded data output apparatus and the recording apparatus, using the authentication method selected;

after conducting the authentication, sending/receiving data between the reproducing apparatus and the decoding apparatus; and

in the case where a water mark is included in the data, detecting the water mark,

wherein exchanged between the reproducing apparatus and decoding apparatus is scrambled by a scrambling method corresponding to the type of the recording medium.

5. A reproducing method for reproducing data recorded in a recording medium, comprising:

deciding a type of the recording medium;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium;

conducting, based on the authentication method selected, authentication between a reproducing apparatus for reproducing and outputting data recorded in the recording medium and a decoding apparatus for decoding the data outputted from the reproducing apparatus;

after conducting the authentication, sending/receiving data between the reproducing apparatus and the decoding apparatus; and

in the case where a water mark is included in the data, detecting the water mark, wherein data sent/received between the reproducing apparatus and decoding apparatus is scrambled by a scrambling method corresponding to the type of the recording medium.

6. A recording method for recording coded data outputted from a coded data output apparatus onto a recording medium by a recording apparatus, comprising:

deciding a type of the recording medium;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium and conducting authentication between the coded data output apparatus and the recording apparatus in accordance with the authentication method selected;

in the case where a water mark is included in the coded data, detecting the water mark;

outputting data from the coded data output apparatus to the recording apparatus; and

writing the data onto the recording medium, with a code for indicating a copy limitation imposed on the data and a code for indication if the data has been scrambled or not.

7. A method for reproducing data recoded in a recording medium, comprising:

reproducing by a reproducing apparatus, from the recording medium, the data, with a code for indicating a copy limitation imposed on the data and a code for indication if the data has been scrambled or not, and outputting the data and the codes;

deciding a type of the recording medium;

based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium;

conducting authentication between the reproducing apparatus and a coding apparatus for decoding the data;

after conducting the authentication, sending/receiving data between the reproducing apparatus and the decoding apparatus; and

in the case where a water mark is included in the coded data, detecting the water mark.