JPH1196676A - Recording medium and reproducer for the recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a recording medium from being copied without changing the data format fundamentally by recording predetermined specified data in advance in areas which are not read out at the time of a copy and judging whether the specified data are recorded or not when a recording medium is reproduced. SOLUTION: In a disk of which recording density is made high (4 bits express one hexadecimal digit), TIME area data of a read-in area are constituted of frame numbers of 24 bits and a recording is performed so as to become hexadecimal 'FFFFFH' (H expresses hexadecimal) at the end of the read-in area. Then, for example, specified data '48, 49, 47, 48, 20, 44, 45, 4E, 53, 49, 54, 59, 20, 44, 49, 53, 43, 20' are repeatedly recorded in data areas where contents of TIME areas become 'FFFFCC', 'FFFFDD', 'FFFFEE'. At the time of reproduction, a copied disk is judged by inspecting data areas where contents of the TIME areas become 'FFFFCC', 'FFFFDD', 'FFFFEE'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording medium and a reproducing apparatus therefor, and more particularly to a recording medium capable of preventing copying and a reproducing apparatus therefor.

[0002]

2. Description of the Related Art CD (Compact Disc) audio, CD
Various recording media including a ROM (Compact Disc-Read Only Memory) and a DVD (Digital Video Disc) have been developed. The recording format of these recording media is predetermined by each standard. For example, in CD, depending on the CD format,
The outer diameter of the disk, the track pitch, the configuration of data, and the like are finely determined.

[0003]

However, a conventional recording medium, for example, a CD disk, is not formatted in consideration of copy protection, and is easily copied by a user.

An object of the invention described in claim 1 or 2 is to provide a recording medium capable of preventing copy without basically changing a data format.

It is an object of the present invention to provide a reproducing apparatus capable of preventing copying without basically changing the data format.

[0006]

A recording medium according to claim 1 is a recording medium on which data is recorded in a standard data format, wherein data different from existing data is recorded in an area which is not read at the time of copying. It is characterized by having done.

Since data different from existing data is recorded in an area that is not read during copying, it is determined whether or not the data is recorded in this area.
It can be determined whether or not the recording medium has been copied.

The standard data format is a CD.
It refers to a standardized data format such as the standard or the DVD standard.

According to a second aspect of the present invention, there is provided a recording medium on which data is recorded in a CD format, wherein data different from existing data is recorded in a data area of a specific address of a lead-in area. I do.

[0010] The contents of the data area at a specific address in the lead-in area are not read during copying. Therefore, by determining whether or not data different from existing data is recorded in this area, it can be determined whether or not the recording medium is a copied recording medium.

According to a third aspect of the present invention, there is provided a reproducing apparatus for reproducing information recorded on a recording medium mounted thereon, and for extracting information of a data area at a specific address of a lead-in area. The information processing apparatus includes an extraction unit and a determination unit for determining whether the information in the data area of the specific address extracted by the extraction unit is existing data or not, to determine whether the recording medium is a copied recording medium.

The contents of the data area at a specific address in the lead-in area are not read during copying. Therefore, the reproducing apparatus can determine whether or not the recording medium is a copied recording medium by determining whether or not the specific data is recorded in this area.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) Recording Medium Hereinafter, embodiments of the present invention will be described by taking a high-density CD audio disk or CD-ROM disk as an example.

The density of the CD disk is increased by compressing the track pitch and pit length of the disk, for example. For example, by compressing the track pitch and the pit length by 1 / √2, respectively, it is possible to obtain twice the recording density and the recording capacity.

[0015] In addition to the increase in the recording density, the recording capacity can be remarkably improved by using a plurality of recording layers. Then, by adjusting the focal position of the reading beam, it is possible to read the data of each layer. As described above, if the recording density is doubled, the recording capacity is doubled when the recording layer is a single layer. Further, the recording layer is set to 2
.., The recording capacity is 4 times, 6 times,.

(1) First Embodiment Next, a specific recording method will be described. FIG. 1 is a diagram showing a frame structure of a subcode Q channel in a lead-in area of a CD disk according to one embodiment of the present invention. This frame structure is basically the same as that of the conventional CD disk. The lead-in area includes a 4-bit control area, a 4-bit address area, an 8-bit area in which 00 information indicating the lead-in area is recorded, an 8-bit POINT area, and a 24-bit TI.
ME area and 8-bit ZE in which all data is represented by 0
RO area, 24-bit PTIME area, 1
And a 6-bit CRC area. The TIME area includes a MIN area, a SEC area, and a FRAME area each having 8 bits.

As described above, by increasing the density of a CD disk, it is possible to record more information than a conventional CD disk. For example, a conventional CD audio disc can only record for up to 74 minutes, but the higher density allows recording for more than 100 minutes. However, TIME in the conventional CD format
Since the area was recorded in BCD (Binary Code Decimal), it could be represented only up to 99 minutes and 59 seconds. In the present embodiment, the content of the TIME area is represented by a binary code instead of a BCD, so that the time can be represented by about 38 times as long as that in the related art. That is, the MIN area in the TIME area, the SEC area
The frame of the area and the FRAME area is removed, and the frame number is represented by 24 bits. Since 74 frames are 1 second,
It can be expressed up to 2 ²⁴表 わ 74 = 226719 seconds. This is about 3779 minutes, about 3 minutes compared to the conventional maximum of 100 minutes.
Eight times the time can be represented.

As shown in FIG. 1, the TIME area is composed of 24 bits (4 bits represent a 1-digit hexadecimal number). In the lead-in area, the data of the TIME area is recorded by being incremented by one. . In a high-density disc, the data in the TIME area is recorded so as to be "FFFFFFH" at the end of the lead-in area. Hereinafter, "H" indicates a hexadecimal number. Then, the content of this TIME area is “FFFFCCH”,
Specific data, for example, "48, 49, 47," in the data area of "FFFFDDH" and "FFFFEEH" (see data and parity 100 in FIG. 1).
48, 20, 44, 45, 4E, 53, 49, 54, 5
9, 20, 44, 49, 53, 43, 20 "are repeatedly recorded. The relationship between the TIME area and the data area in the data and parity 100 at this time is shown in FIG.

Referring to FIG. 2, ordinary data XX (X represents predetermined data) is recorded in areas other than the specific TIME area, but in the data area represented by the specific TIME area, Specific data is recorded.

FIG. 3 is a diagram showing details of the data and parity areas adjacent to the subcode area. (A) in the figure
Shows a form 1 for data of a CD-ROM XA, for example, and (b) shows the contents of a data area of a form 2 for CD audio or the like. As is clear from the figure, Form 1 has a format in which error correction is enhanced, as in the case of the CD-ROM, and Form 2 is a format in which a larger amount of data is recorded without enhancing error correction. The specific data described above is recorded in the data area in any format.

Information necessary for reading data recorded in the data area is recorded in the lead-in area. Therefore, in a proper copy method, for example, when copying the data a of the A disk to the B disk, the data a is read based on the information a ′ of the lead-in area of the A disk, and the data of the B disk is read. Data a is recorded in the area. Then, information b 'necessary for reading the data a recorded on the B disk is recorded in the lead-in area of the B disk. Therefore, the information a 'of the lead-in area of the A disk and the information b' of the lead-in area of the B disk are different, and information in the lead-in area which is not directly related to data is copied from the A disk to the B disk. It is impossible.

As described above, the address of the TIME area of the lead-in area in the B disk is "FFFFCCH",
By comparing the information of the data portions “FFFFDDH” and “FFFFEEH” with the specific data described above, it is possible to determine whether the disc is a legitimate disc or a copied disc.

(2) Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment, information for identification is recorded in the data area in the lead-in area. In this embodiment, data for identification is recorded in the subcode area. .

For example, if the content of the TIME area is "FFF
FCCH "," FFFFDDH "and" FFFFEE
This is performed by recording specific data in an area other than the TIME of the subcode area H ”.
By recording specific data other than 0 in the ZERO area where only 0 in the subcode area is defined, the data can be used as identification data. In addition,
Data for identification may be recorded in any area other than the ZERO area in the subcode.

(B) Recording / Reproducing Apparatus FIG. 4 is a block diagram showing a schematic configuration of a recording apparatus for recording data on a CD-ROM disk according to the present embodiment. The recording apparatus includes a data source 1 that is information to be recorded in a data area in a CD format, a subcode source 2 that is information to be recorded in a subcode area in a CD format, and an output from a subcode source 2. A sub-code generator 3 for generating data to be recorded in a sub-code area in response to received data, and for generating recording data by encoding data output from the data source 1 and the sub-code generator 3 A CD encoder 4, an optical modulator 5 for modulating the intensity of a recording laser in accordance with recording data output from the CD encoder 4 and generating a write pulse, and recording the data on a mounted CD-ROM disc master. A writing device 6 for writing data.

The CD encoder 4 outputs a synchronizing signal Sy
Data is input from the data source 1 and the sub-code generator 3 in synchronization with the nc signal, and these data are encoded to generate recording data conforming to the CD format. Data output from the subcode source 2 includes TOC (Table Of Contents) as table of contents information,
There are information such as the start time and end time of each track, the start time from index 00, and Modes 2 and 3.

The optical modulator 5 modulates the intensity of the recording laser according to the recording data output from the CD encoder 4 to generate a write pulse. Then, the recording data is written by guiding the pulse light to the master disc set in the writing device 6.

FIG. 5 is a block diagram showing a schematic configuration of the reproducing apparatus according to the embodiment of the present invention. The playback device is
A spindle motor 12 for driving a turntable holding the disk 11, a motor servo 13 for controlling the number of rotations of the spindle motor 12,
Pickup 14 for reading data recorded in 1
A tracking servo 15 for tracking the pickup 14; a reproducing unit 16 for amplifying high-frequency data and the like read by the pickup 14; and a signal output from the reproducing unit 16 as a pulse signal. Waveform equalizer 17 for shaping and waveform equalizer 1
7, a demodulation unit 18 for demodulating the signal pulsed by the sub-code 7, a sub-code separation unit 19 for separating a sub-code from the data demodulated by the demodulation unit 18, and a sub-code separation unit 19 It includes a control code separation unit 20 for separating a control code from a code, and a CPU (Central Processing Unit) 21 for controlling the entire playback device.

When the disc 11 is set in the reproducing apparatus, the TOC information of the disc 11 is first read. The TOC information is input to the subcode separation unit 19 via the pickup 14, the reproduction unit 16, the waveform equalization unit 17, and the demodulation unit 18, and the subcode is separated from the TOC information. The CPU 21 reads the subcode output from the subcode separation unit 19 and detects that the CD-ROM disk is a high-density disk. For example, the present applicant reads out the identification information of the high-density disk disclosed in Japanese Patent Application No. 9-179732 to detect that the disk is a high-density disk. Then, in order to reproduce data recorded on the high-density disk, the characteristics of the waveform equalizing unit 17 are switched so as to improve the frequency characteristics as compared with the normal dense disk. Further, the tracking servo 15 is controlled so as to correspond to the compressed track pitch.

FIG. 6 is a flowchart showing a processing procedure of the reproducing apparatus according to the present embodiment. First, it is determined whether the disc set in the reproducing apparatus is a normal dense disc or a high-density disc (S1). The user sets in advance whether or not the disc is a normal dense disc or a high-density disc by using a switch or the like provided on an operation panel of a reproducing apparatus (not shown) in advance.

In step S1, if the set disk is a high-density CD or a high-density CD-ROM (S1, Yes), the TIME area of the subcode Q channel in the lead-in area is "FFFFCCH", "FFF".
The data portions of "FDDH" and "FFFFEEH" are accessed (S2).

The data read in step S2 is compared with the specific data described above. If the data does not match the specific data (S3, No), it is determined that the disc is a copied disc and the reproduction is stopped (S4). If the data matches the specific data (S3, Yes), the reproduction is continued assuming that the disc is a regular disc (S3).
5).

In step S1, the set disk 11 is a high-density CD or a high-density CD-ROM.
If not (S1, No), it is determined whether the set disk 11 is a playable disk (S6). For example, when a disc of a different type is set, the TOC information cannot be read, so that the disc is determined as an unplayable disc. If the set disc is a playable disc (S6, Yes), the reproduction is continued (S6).
7). If the set disk is a non-reproducible disk (S6, No), the reproduction is stopped (S8).

In the present embodiment, a CD audio disk and a CD-ROM disk have been described as examples, but the present invention is not limited to these and can be applied to media of various formats. further,
The data for identification is not limited to those described above, and may be identified by other values.

In the above-described embodiment, a read-only disc is used, but the present invention can be applied to a recordable disc. In this case, the data for identification may be written in the recording device at the time of recording.

In the above embodiment, an example of copy prevention in a high-density recording medium has been described. However, the present invention is not limited to this, and it goes without saying that copy prevention can be similarly performed in a conventional ordinary dense recording medium. Absent.

[0037]

According to the recording medium of the first or second aspect, since data different from existing data is recorded in an area that is not read at the time of copying, copy is prevented without basically changing the data format. It has become possible to provide a recording medium that is capable of recording.

According to the third aspect of the present invention, it is possible to determine whether a recording medium is a copied recording medium based on whether information in a data area at a specific address in a lead-in area is existing data. became.

[Brief description of the drawings]

FIG. 1 is a diagram showing a frame structure of a subcode Q channel in a lead-in area.

FIG. 2 is a diagram showing a relationship between a TIME area and a data area.

FIG. 3 is a diagram showing a structure of a data area of a CD format.

FIG. 4 is a block diagram illustrating a schematic configuration of a recording apparatus according to an embodiment of the present invention.

FIG. 5 is a block diagram illustrating a schematic configuration of a playback device according to the embodiment of the present invention.

FIG. 6 is a flowchart showing a processing procedure of the playback device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Data source 2 Subcode source 3 Subcode generator 4 CD encoder 5 Optical modulator 6 Writing device 11 Disk 12 Spindle motor 13 Motor servo 14 Pickup 15 Tracking servo 16 Reproduction part 17 Waveform equalization part 18 Demodulation part 19 Subcode Separation unit 20 Control code separation unit 21 CPU 100 Data and parity

Claims (3)

[Claims] 1. A recording medium on which data is recorded in a standard data format, wherein data different from existing data is recorded in an area that is not read at the time of copying. 2. A recording medium on which data is recorded in a CD format, wherein data different from existing data is recorded in a data area at a specific address of a lead-in area. 3. A reproducing apparatus for reproducing information recorded on a mounted recording medium, comprising: extracting means for extracting information of a data area at a specific address of a lead-in area; A determination unit for determining whether or not the extracted information of the data area at the specific address is existing data, to determine whether or not the information is a copied recording medium.