KR100218911B1 - Compact disc for preventing copy and control method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc, and more particularly, to a non-replicable compact disc for preventing unauthorized copying, and a playback control method thereof, in which a lead-in area of the disc is damaged in the manufacturing process of the compact disc so that the disc can be played only in a specific playback device.

When producing a compact disc, the lead-in area containing the information about the disk is mechanically broken, and the compact disc player reads the disc by moving the pickup to the program area instead of the lead-in area to read the damaged compact disc. If an error occurs, it may be a conventional compact disc, so that the pickup unit is moved to the lead-in area of the disc and the disc is read in the same manner as the disc is read by a conventional player.

Therefore, the disc of the present invention, in which the lead-in area is damaged during the production process, cannot be read by the conventional disc lead method, so that the disc can be played only in a specific device that reads the disc by the disc lead method according to the present invention, thereby preventing unauthorized copying of the disc. Can be.

Description

Compact disc for prevention of unauthorized copying and its playback control method

The present invention relates to a non-replicable compact disc for preventing unauthorized copying and a reproduction control method thereof, in which a lead-in area of the disc is broken in the manufacturing process of the compact disc, so that the disc can be reproduced only in a specific playback device.

FIG. 1 shows a structure of data recorded on a general compact disc. A compact disc has information on various discs such as the type of disc, the number and size of programs stored on the disc, and the start address of each program. A lead in area 10, a program area 11 having substantial program data, and a lead out area 12 for recognizing the end of the data.

The program area 11 is subdivided into useless data area 11a and usable data area 11b.

2 is a schematic block diagram showing the configuration of a compact disc player for reading data from a compact disc having the above structure, the compact disc player having a spindle motor 20 for rotating the disc at a constant speed; A spindle motor driver 21 for driving the spindle motor 20, a pickup unit 22 for detecting a signal from a disk rotated by the spindle motor 20 using an optical signal, and a pickup unit for moving and focusing the pickup unit. A pickup driver 23 for adjusting a signal, a signal processor 24 which separates and outputs only an audio signal from an error correction signal and various address information signals among the signals detected by the pickup unit 22, and controls each of the components. It consists of the microcomputer 25. As shown in FIG.

Referring to FIG. 3, a process for reading data from a compact disc by a compact disc player having the above configuration, first, the pickup driving unit 23 moves the pickup unit 22 to the lead-in area of the disc ( S10), focusing (S11). At this time, it is checked whether an error occurs (S12), if an error occurs, the disc read error is notified to the user (S19), if the error does not occur, the constant linear velocity method (Constant Linear Velocity; called 'CLV'), etc. Rotate the disk at a constant speed using (S13).

At this time, since the linear speed method is a method of recording and reproducing the disk, the predetermined speed is rotated by a predetermined length, so that the outer track of the disk is slower than the inner track. In contrast, there is a constant angular velocity method (called 'CAV'), in which the number of revolutions per second is the same in the outer and inner tracks of the disc.

In general, compact discs record the audio signal itself, so the fixed speed method is used, and CD-ROM and laser discs that record constant data and programs use both methods.

Thereafter, it is checked whether an error has occurred in step S13 (S14). If an error occurs, a disc read error is notified to the user (S19). If no error has occurred, TOC (Total Of Content) is indicated. Read (S15).

The TOC is a portion that stores various kinds of information about the disk in the lead-in area, so that the type of the disk can be determined by reading the TOC.

In step S15, it is checked whether an error occurs while reading the TOC (S16). If an error occurs, a disc read error is displayed (S19). S17), the process after the processing for each disc type is performed (S18).

The compact disc processing method as described above has a problem in that all the compact discs can be reproduced without permission from any playback device, thereby preventing the security of data.

Accordingly, the present invention has been made to solve the above-described problem, and an object of the present invention is to provide an unauthorized copy preventing compact disc and a reproduction control method thereof, which allow the compact disc to be played only in a specific player.

The object of the present invention as described above is achieved by controlling the reproducing apparatus to apply a disc read method which breaks the TOC in the lead-in area of the compact disc and enables the TOC to read the broken compact disc.

1 is a block diagram schematically showing the structure of a typical compact disk;

Fig. 2 is a schematic block diagram showing the configuration of a compact disc player for reading data from a compact disc;

3 is a flowchart for explaining a reading method of a general compact disc player;

Fig. 4 is a flowchart for explaining a read method of the compact disc player according to the present invention.

* Explanation of symbols for main parts of the drawings

10: LEAD IN area

11: program area

11a: obsolete data area

11b: Available data area

12: LEAD OUT area

20: spindle motor

21: spindle motor drive unit

22: pickup section

23: pickup drive unit

24: signal processing unit

25: microcomputer

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention for preventing unauthorized copying of a compact disc and a reproduction control method thereof will be described in detail with reference to the accompanying drawings.

In the present invention, in order to prevent unauthorized copying of a compact disc, the lead-in area containing information about the disc and the useless data area of the program area are mechanically damaged when the compact disc is manufactured, and the compact disc player is a lead-in area. Instead, it reads the available data area of the program area and controls the disk to be processed.

Therefore, the read method of the conventional reproducing apparatus which reads the TOC of the lead-in area of the disc to determine and processes the disc type, cannot read the compact disc having the above structure.

Fig. 4 is a flowchart for explaining a method for reading a compact disc player according to the present invention which can read a compact disc having the above structure, and operates in the following order.

First, the pickup drive unit 23 moves the pickup unit 22 to the program area of the disc (S20) and focuses (S21). At this time, it is checked whether or not an error occurs (S22), if the error does not occur, the disk is rotated at a constant speed by a fixed speed method or the like (S23).

Thereafter, it is checked whether an error has occurred in the process (S23) of rotating the disk at a constant speed (S24), and if the error does not occur, it is determined whether the disk according to the present invention (S25).

At this time, if an error occurs in steps S22 and S24, the process skips to the beginning of FIG. 3 (S27). The pickup unit 22 moves to the lead-in area of the disc to read the disc by the conventional disc read method. Move the disk, rotate the disk at a constant speed, and determine the type of disk.

When it is determined that the disc according to the present invention is determined in step S25, a process of processing the disc is performed (S26). When it is determined that the disc is not according to the present invention, the disc is read by a read method of a conventional reproducing apparatus. In order to skip to the beginning of Figure 3 (S27) to end the series of processes.

In order to process both the disc for preventing unauthorized copying according to the present invention and the conventional disc in the reproducing apparatus which performs the above process, as shown in FIG. It is also possible to read the lead-in area of the disc by going to the beginning of the conversely, and conversely, read the lead-in area of the disc in the conventional manner shown in FIG. You may.

As described above, according to the present invention, the present invention provides a compact disc for preventing unauthorized copying and a reproduction control method thereof. The present invention provides a compact disc in which the lead-in area of the disc is broken when a disc is produced, and a read method for reproducing the disc. As a result, playback can be performed only on a specific playback device, and a disc cannot be read by a control method used in a general playback device, a CD-ROM, a disk copying machine, etc., thereby preventing unauthorized copying and maintaining data security.

Claims (3)

A compact disc for preventing unauthorized copying, wherein the lead-in area storing information about the disc is broken, and predetermined data for recognizing the type of disc is stored in the program area. A first process of moving and focusing the pickup part to the program area of the disc to read the compact disc for preventing unauthorized copying; A second process of rotating the disk at a constant speed after performing the first process and determining whether the disk is for unauthorized copy prevention; And a third process of processing the disc when the disc is an unauthorized copy prevention disk in the second process. The method of claim 2, wherein in the first process and the second process, A reproduction control method for an unauthorized copy protection compact disc, wherein an error occurs or the disk is not recognized as a compact disc for preventing unauthorized copying by moving the pickup unit to the lead-in area of the disk.