Unlock instant, AI-driven research and patent intelligence for your innovation.

Recording medium, data recording method and apparatus, data regenerating method and apparatus, and copy control method

a recording medium and data recording technology, applied in the field of recording medium, data recording method and apparatus, data regenerating method and apparatus, copy control method, etc., can solve the problem that the method has been an obstacle to circulating music contents widely, and the recording medium storing encrypted contents such as a disk cannot be reproduced by an existing disk reproducing apparatus

Inactive Publication Date: 2005-07-21
SONY CORP
View PDF13 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0072] performing copy control of the data read from the recording medium in accordance with the first copyri

Problems solved by technology

Therefore, the method has been an obstacle for circulating music contents widely in a short time.
Moreover, a plurality of melodies are recorded in a medium such as a CD, a user may enjoy only one specific melody or only several melodies among the recorded melodies or may not want to buy the whole medium, that is, the DC.
However, there is a problem that a recording medium storing encrypted contents such as a disk cannot be reproduced by an existing disk reproducing apparatus such as a CD reproducing apparatus.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recording medium, data recording method and apparatus, data regenerating method and apparatus, and copy control method
  • Recording medium, data recording method and apparatus, data regenerating method and apparatus, and copy control method
  • Recording medium, data recording method and apparatus, data regenerating method and apparatus, and copy control method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0092] the present invention is described below. FIG. 1A shows a recording medium of the present invention such as a disk 1. The disk 1 is an optical disk in which a recording area is divided into two areas in the radius direction of the disk and a first recording area (referred to as first part) PA1 and a second recording area (referred to as second part) are formed. First content data that is unencrypted data (clear text) such as first audio data is recorded in inner tracks of the disk 1. Second contents data at least a part of which is encrypted such as second audio data is recorded in the second part PA2 at outer tracks of the disk 1. Moreover, a center hole 2 is formed at the central portion of the disk 1.

[0093]FIG. 1B shows another disk to which the present invention is applied. In the case of a disk 1′, a program area is divided into four areas in the radius direction and thereby, recording areas PA1, PA2, PA3, and PA4 are formed. First unencrypted data and third unencrypted ...

second embodiment

[0186] A water mark strong for and a water mark weak for a linear PCM signal serving as uncompressed digital data in accordance with the so-called CD standard recorded in a first part PA1 are embedded in the optical disk 1 of the present invention and only a strong water mark is embedded in the compressed and / or encrypted digital data recorded in a second part PA2.

[0187] In this case, “strong” of a strong water mark and “weak” of a weak water mark respectively denote a difficulty degree of disappearance of a water mark, in other words, a strong water mark is a strong water mark having a large survival strength and not easily disappearing through signal processing such as compression applied to digital data and a weak water mark is a weak water mark having a small survival strength and disappearing through signal processing applied to digital data. For example, a strong watermark is embedded by spectrum-diffusing the data of the watermark and superimposing the diffused data on digita...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Data is recorded in a first part PA1 in accordance with a signal format same as that of an existing CD at the lower limit (1.5 μm) of an allowable value of a track pitch and the lower limit (1.2 m / sec) of a linear velocity. As a result, the data for the maximum regeneration time (74.7 min) can be recorded in the first part PA1. An existing CD reproducing apparatus can reproduce the audio data recorded in the first part PA1 with no problem. Moreover, compressed and encrypted audio data is recorded in a second part PA2 at a single density or a double density. The single density represents a recording density same as that of an existing CD and the double density represents a density two time larger than the single density. Furthermore, the audio data recorded in the second part PA2 is charged when reproduced in order to protect copyrights. The format of the data recorded in the second part PA2 uses the format of a CD-ROM.

Description

TECHNICAL FIELD [0001] The present invention relates to recording medium, data recording method and apparatus, data reproducing method and apparatus, and a copy control method which are applied to a disc-like recording medium comatible with a so-called compact disc. BACKGROUND ART [0002] For compact disc (CD) and DVD (Digital Versatile Disc or Digital Video Disc) and the like, various copy-prevention arts for preventing illegal copy are proposed and practically used in order to protect copyrights. For example, SCMS (Serial Copy Management System) permits a first-generation copy from a CD to an MD (Mini Disc: trade mark) but inhibits a second-generation copy from an MD to other medium. Moreover, a copy-generation restriction system is also known which restricts what-th generation copy can be generated. [0003] Moreover, music contents have been recently circulated in accordance with quick advancement of networks including Internet. Under the above situation, EMD (Electronic Music Dist...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F21/10G06F21/62G06Q50/00G06Q50/10G09C5/00G11B7/007G11B7/26G11B19/02G11B20/00G11B20/10G11B20/12G11B27/034G11B27/10G11B27/30G11B27/32
CPCG11B7/007H04N2005/91364G11B19/02G11B20/00007G11B20/00086G11B20/0021G11B20/0063G11B20/0071G11B20/00768G11B20/00913G11B20/10527G11B20/1217G11B20/1251G11B20/1262G11B27/034G11B27/105G11B27/3063G11B27/329G11B2020/00014G11B2020/10546G11B2220/20G11B2220/213G11B2220/2537G11B2220/2545G11B2220/2583G11B2220/41H04N5/85H04N9/8205G11B7/261G11B20/00492G11B7/0079
Inventor SAKO, YOICHIROINOKUCHI, TATSUYA
Owner SONY CORP