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Encrypted contents recording medium and apparatus and method for reproducing encrypted contents

a recording medium and encrypted content technology, applied in recording signal processing, instruments, television systems, etc., can solve the problems of inability to tell if the playback apparatus is working, inability to decrypt the contents, and application of drm

Inactive Publication Date: 2006-01-05
SOVEREIGN PEAK VENTURES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a data structure that allows for proper playback of both copy-protected and DRM-protected content on a medium. This structure includes a terminal device that can play back encrypted content on the medium. The device can acquire a content key from outside the medium and communicate with the acquisition source to decrypt the content using the key. The technical effect of this invention is to enable seamless playback of protected content on a wide range of devices and platforms."

Problems solved by technology

Applying DRM brings out a problem, however, when a medium stores therein both contents to which conventional copy protection is applied and contents to which DRM is applied.
That is to say, a playback apparatus is not able to tell if each of the contents has conventional copy protection applied thereto or DRM applied thereto.
Even if an attempt is made to decrypt, with a media key, contents to which DRM is applied, it is not possible to decrypt the contents.
Conversely, even if an attempt is made to search for a license that corresponds to contents 1-0 to which conventional copy protection is applied, since no corresponding license exists, it is not possible to play back the contents.

Method used

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  • Encrypted contents recording medium and apparatus and method for reproducing encrypted contents
  • Encrypted contents recording medium and apparatus and method for reproducing encrypted contents
  • Encrypted contents recording medium and apparatus and method for reproducing encrypted contents

Examples

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first embodiment

Overall Structure of the Contents Playback System

[0045] The following describes in detail the first embodiment of the present invention, with reference to the drawings.

[0046]FIG. 1 is a schematic drawing of the overall structure of the contents playback system according to the first embodiment of the present invention.

[0047] The contents playback system comprises: a terminal device 101 operable to play back contents; a medium 102 that stores therein encrypted contents and other data; a display device 103 operable to display contents played back by the terminal device 101; a license server 104 operable to generate and distribute a license; and a transmission line 105 that connects the terminal device 101 with the license server 104.

[0048]FIG. 2 shows the internal structure of the terminal device 101 and information recorded on the medium 102.

[0049] Firstly, the internal structure of the terminal device 101 is to be described.

[0050] The terminal device 101 comprises: a contents...

second embodiment

[0280] The following describes the contents playback system of the second embodiment of the present invention. The contents playback system of the second embodiment has almost the same configuration and operates almost in the same manner as the contents playback system of the first embodiment except that there are partial differences; therefore, only the differences from the first embodiment will be described. Also, the same reference signs are used in the drawings to describe the components in common.

[0281] The first embodiment describes a case where, when the contents playback unit 200 is to acquire a rights key, the connection destination module is the same as the module transmitting the rights key.

[0282] The second embodiment describes a case where, when the contents playback unit 200 is to acquire a rights key, the connection destination module is not necessarily the same as the module transmitting the rights key.

[0283]FIG. 21 shows the internal structure of the terminal dev...

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Abstract

The present invention aims to provide an encrypted contents playback apparatus and an encrypted contents playback method that are suitable for playing back contents from a medium storing therein both contents to which conventional copy protection is applied and contents to which DRM is applied, as well as to provide a recording medium in which data used by such playback apparatus or method is recorded. The medium of the present invention stores therein information that indicates whether the contents have conventional copy protection applied thereto or DRM applied thereto. The terminal device determines which key should be used for decrypting the contents based on the information.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to apparatuses and methods for playing back contents of which the copyrights are protected and recording media for storing data used by the apparatuses and in the methods. [0003] 2. Description of the Related Art [0004] For DVDs (Digital Versatile Discs), CSS (Contents Scrambling System) has been introduced to prevent unauthorized copying of contents. In CSS, a piece of information unique to a DVD medium is recorded, and a title key is generated from this piece of information and another piece of information stored in the playback apparatus. Encrypted contents recorded on the DVD medium are decrypted using the title key and played back. (See, for example, the Japanese Unexamined Patent Application Publication No. 2003-37589). [0005] On the other hand, it has become popular lately to use the DRM (digital Rights Management) System in contents distribution systems. In the DRM system, a lic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/30
CPCG06F21/10G11B2220/2541G11B20/00086G11B20/00181G11B20/00195G11B20/0021G11B20/00253G11B20/00492G11B20/00731G11B20/00797G11B20/0084G11B20/00847G11B20/00862G11B27/105G11B27/329G06Q20/3829
Inventor TOHRU, NAKAHARARYUICHI, OKAMOTOYAMAMOTO, MASAYAKATSUMI, TOKUDAMASAYA, MIYAZAKIKOZUKA, MASAYUKI
Owner SOVEREIGN PEAK VENTURES LLC