KR100309694B1 - Optical discs capable of authentic discrimination and methods for discriminating them - Google Patents

Abstract

The present invention relates to a specific field of a playlist data area of an optical disk in a specific field of a reproduction control data area including head data of a data bit string of a predetermined size recorded on the optical disk so that the optical disk can be discriminated in its authenticity. Record data different from the recording data of the recording medium, and use the same whether the recording data of a specific field of a playlist data area on the optical disk and the recording data of a specific field of a reproduction control data area corresponding thereto are used when the optical disk is inserted and mounted; An optical disc capable of authenticating the authenticity of anti-piracy by discriminating whether or not the inserted optical disc is genuine and stopping the subsequent data processing operation of the optical disc in some cases; A method for determining the authenticity of the optical disc according to the present invention is to insert an optical disc mounted therein. A first step of reading playlist data from an initial playback area of the disk; A second step of reproducing the recording data of the optical disc to extract reproduction control data; A third step of confirming whether or not the record data of a specific field on the read playlist data and the record data of a field corresponding to the specific field on the extracted reproduction control data are identical; And a fourth step of discriminating the inserted optical disc as the original according to the verification result, which is a very useful invention that can prevent illegal copying of the optical disc in public.

Description

Optical discs capable of authenticity determination and methods for determining same

The present invention relates to an optical disc capable of authenticating an authentic disc which can easily determine whether an optical disc is authentic or not by using a specific field of a reproduction control data area on the optical disc. Specifying, in more detail, the playlist data area of the optical disc in a specific field of the reproduction control data area including the head data of the data bit string of a predetermined size recorded on the optical disc, so that the optical disc is genuinely determined. Records data different from the recorded data of the field, and whether or not the record data of a specific field of a playlist data area on the optical disc and the record data of a specific field of a reproduction control data area corresponding thereto are inserted when the optical disc is inserted and mounted. Whether or not the inserted optical disc is authentic, and in some cases, By stopping the data processing operation after the disk, preventing illegal copying of the optical disc relates to (Anti-Piracy) determining the original copy the optical disc and the method of determination thereof.

Compact discs (CDs), which are generally used as read-only discs, are used for recording media such as large programs, movies, and music because of their large storage capacity, and their penetration rate is rapidly increasing. Even if the digital data recorded on the fabricated optical disk is repeatedly detected, there is no friction with the medium during recording detection, so the signal quality is the same as the original, and the information preservation performance is excellent. There was,

However, due to the development of technology, a recordable optical record medium having excellent information storage performance has emerged as described above, and the price of a device capable of recording a signal on such an optical record medium has decreased, so that in recent years, a useful program or the like is easily recorded. Optical discs can be cloned, and a large number of illegal copy companies produce and distribute optical discs identical to the originals using a read-only disc production apparatus.

As a result, the software industry has suffered enormous losses due to piracy, and has been a cause for declining software developers' motivation. Therefore, the regulation on optical disk cloning is intensifying, but personal or covert piracy is prevented. Discrimination of the original of the disc and the copy protection technology using the same has emerged as a major solution in the field of optical storage media.

Therefore, various methods have been proposed to prevent illegal copying of the optical disk as described above. As one of the methods, the present inventors have described the "signal recording method of the copy preventing optical disk and the copy protection of the optical disk using the recording method." Method "has been filed in the patent application No. 97-32576, the signal recording method of the optical disk for copy protection proposed by the present invention and the method of copy protection of the optical disk using the recording method is specified in a certain area on the optical disk. One bit of a standard symbol or codeword is shifted by a predetermined size to be read out and reproduced as two signals, recorded as an abnormal symbol (delayed pit form), and the non-standard symbol is reproduced during reproduction. When played with two standard symbols, the optical disc was determined from the original.

However, in the above-described signal recording method of an optical disk for copy protection and an optical disk copy protection method using this recording method, an optical signal is moved by moving one bit of a specific standard symbol or codeword to a predetermined area on the optical disk. Since accurate recording must be made in an undefined area on the disc (the area between the pit and the pit that is not within the tolerance range of the specified pit), much precision is required to control the delay amount of the recording pit. In order to provide a high cost, this increases the manufacturing cost of the optical disc, whereas in the case of using the optical disc manufacturing equipment of low precision, the abnormal symbol is one standard symbol when reproducing the original optical disc produced by the optical disc. Problems occur because they are played back only and cannot be determined as the original. It is good.

In addition, since an indeterminate area is managed by a large number of manufacturers in accordance with driver characteristics, even if expensive equipment that precisely processes the pit delay amount is used, an abnormal symbol is indeterminate when a disc is reproduced in a specific driver among the drivers having different indeterminate areas. It can be played back with only one standard symbol because it does not belong to the area. If delayed data is played back with only one symbol, a problem may be caused that the inserted optical disc is incorrectly identified as a duplicate even though the inserted optical disc is authentic.

Therefore, the present invention was created to solve the above problems, by recording data different from the recording data of the specific field of the playlist data area of the optical disc in the specific field of the reproduction control data area of the optical disc, SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disc capable of authenticating an authentic disc and a method of discriminating the same, which can easily manufacture and discriminate a genuine optical disc.

Fig. 1 shows the recording format of data recorded on an optical disk and the form of sub-coding data,

Fig. 2A shows the form of playlist data recorded in the lead-in area on the optical disc,

FIG. 2B illustrates the form of sub-Q channel data among the sub-coding data of FIG. 1;

Fig. 3 shows the configuration of a preferred embodiment of the apparatus for determining the authenticity of an optical disk for implementing the authenticity discriminating method for an optical disk according to the present invention.

4 is a flowchart showing the flow of a preferred embodiment of the authenticity determination method of the optical disc according to the present invention;

FIG. 5 shows the configuration of the whole system equipped with a CD-ROM driver in order to explain the authenticity of the CD-ROM disk containing the program for determining authenticity in a specific area and its operation.

6A and 6B show the flow of a preferred embodiment of the authenticity determination method of the optical disc according to the present invention made in the overall system of FIG.

※ Explanation of code for main part of drawing

A, A ': true discriminant of optical disc

10 optical disc 11 pickup portion

20: R / F section 30: drive section

40: servo unit 50: digital signal processing unit

60: control unit 61: memory

70: liquid crystal display (LCD) 80: ring buffer

110: memory 120: central processing unit (CPU)

130: keyboard 140: hard disk

An optical disc capable of authenticity determination according to the present invention for achieving the above object includes recording data of a specific field on a reproduction control data area of an optical disc corresponding to the specific field on a playlist data area of the optical disc. This feature is characterized by being recorded in data different from the recorded data of the field.

In addition, the authenticity determination method of the optical disk according to the present invention, the first step of reading the playlist data from the initial playback area of the inserted optical disk; A second step of reproducing the recording data of the optical disc to extract reproduction control data; A third step of confirming whether or not the record data of a specific field on the read playlist data and the record data of a field corresponding to the specific field on the extracted reproduction control data are identical; And a fourth step of discriminating the inserted optical disc as the authentic according to the confirmation result.

The optical disc capable of authenticity determination according to the present invention configured as described above includes the optical disc in a specific field of sub-queue channel data in a reproduction control data area constituted from header data of a predetermined number of data frames on the optical disc. It is made by recording and forming data different from the recording data of a specific field on the playlist data area.

Further, in the authenticity determination method of the optical disk according to the present invention, the playlist data is read from the initial playback area of the inserted optical disk, and the playback control is performed by reproducing the recorded data on the data area of the optical disk. The data will be extracted. Subsequently, the record data of the specific field of the read playlist data and the record data of the field corresponding to the specific field of the extracted reproduction control data are compared to confirm whether they are the same. If they are not equal to each other, the optical disk currently inserted and mounted is discriminated as authentic.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an optical disc capable of authenticity determination according to the present invention and a method of determining the same will be described in detail with reference to the accompanying drawings.

In general, the recording format of a data frame recorded on an optical disc is as shown in Fig. 1, and subcoding data (constructed from header data of a predetermined number (98 frames) of data frames recorded in a data area on the optical disc ( A sub-Q channel of 98 x 8 bits constitutes data for reproduction control of a corresponding data frame, and accesses each item identified by a logical track number recorded in a data area on an optical disc. The playlist data for access is recorded in the track 0 and the track 1 (lead-in area) of the optical disc in the format as shown in Fig. 2A.

The playlist data and the sub-queue channel data configured as described above are generated by the optical disc recording apparatus at the time of recording the data, and thus are not copied from the disc to the disc. In the Control field in FIGS. 2A and 2B constituting a header, data representing the attribute of recording data on the optical disc is recorded. If the optical disc is an audio CD (CD-DA) The recording data on a specific control field in the playlist data and the corresponding control field in the sub-queue channel data is an audio mode code. In the case of a data CD (CD-ROM or Video-CD, etc.), the data mode code is both fields. The same is recorded.

However, in the manufacturing step of the optical disc capable of authenticity determination according to the present invention, in the control field of the sub-queue channel data area on the optical disc, specific data for recording the optical disc to be determined as authentic is recorded. The specific data is any data having a value different from that of the recorded data in the control field of the playlist data area of the optical disc.

More specifically, when the optical disc is an audio CD (CD-DA), an audio mode code is indicated in a control field on a playlist data area of the optical disc, and in a sub-queue channel data of a specific section or a global section on the optical disc. By recording the data mode code in the control field, the recording data of both fields is made different.

Further, in an optical disc such as a CD-ROM, the data is recorded in a specific field of the sub-queue channel data area and in an arbitrary area on the optical disc together with recording of data different from recorded data of a specific field of the playlist data area. The authenticity determination program ('AUTHENTIC PROGRAM') is further formed to determine whether the optical disc is authentic from the same whether or not the recording data of both fields is the same.

When the optical disc produced as described above is reproduced by a general driver, data reproduced by driving along the track is reproduced regardless of whether the data recorded in the control field of the sub cue channel data and the playlist data on the optical disc is the same. Since the digital processing is sequentially output in that order, there is no effect on the normal playback process.

3 is a configuration diagram of a preferred embodiment of an optical disc authenticity determination device for authenticity determination of a genuine optical disc manufactured as described above, and a pickup unit for reading a recording signal by injecting a light source into the optical disc 10; (11); A sled motor 12a for moving the pick-up part 11 in the radial direction of the optical disk; A spindle motor 12b for rotating the optical disc 10; A drive unit 30 for driving the sled motor 12a and the spindle motor 12b; An R / F unit 20 for filtering the signal detected by the pickup unit 11; The driving of the drive unit 30 is controlled from the focus error (FE) and tracking error (TE) signals output from the pickup unit 11, and the rotational speed of the optical disc, and the R / F unit 20 A servo unit 40 for detecting synchronization of an output signal of the controller; A digital signal processor (50) for restoring a signal read by the R / F unit (20) to an original digital signal using the detected synchronization; A controller 60 for determining whether the optical disk is authentic from the data read out from the optical disk and signal-processed; A memory 61 for storing playlist data recorded in the inserted optical disc; And a liquid crystal display (LCD) 70 for displaying authenticity according to the determination result.

4 is a flow chart showing the flow of a preferred embodiment of the optical disc determination method according to the present invention, with reference to the configuration of the embodiment of Figure 3 with respect to the authenticity determination method of the optical disc of FIG. It explains in detail.

First, when the optical disc 10 is inserted and mounted (S10), the control unit 60 controls the pickup unit 11 through the drive unit 30 before reproducing and outputting a specific song (or item). Read out the playlist data recorded in the track 0 and the track 1 (Lead-In) of the inserted optical disc 10. The read playlist data is inserted as shown in FIG. 2A. Information on the attributes of the recorded data on the disc (CONTROL), the total number of tracks (POINT), the playing time of each song (MIN, SEC, FRAME), the absolute time of the start of each song (PMIN, PSEC, PFRAME), etc. It is recorded.

The high frequency signal read out from the pickup section 11 is filtered through the R / F section 20, and the filtered filtered clean signal is detected by the servo section 40, and the digital signal is detected. The processor 50 restores the original digital data by the detected synchronization.

The controller 60 stores playlist data of tracks 0 and 1 of the optical disc 10 restored by the digital signal processor 50 in the memory 61 (S11), and the controller 60 stores the The pickup unit 11 is moved to the data (program) area on the optical disc 10 through the drive unit 30 and the servo unit 40 based on the stored playlist data. In the case of the optical disc in which data different from the recording data of the control field of the playlist data on the optical disc 10 is recorded in the control field of the sub-queue channel data corresponding to the entire program area of the program, the control unit 60 The pick-up unit 11 is moved to an arbitrary position in the program area on the optical disc, and if a specific section (area) rather than the entire program area of the optical disc 10 (for example, the general pause of the optical disc ( pause) In the case of the optical disc in which only the control field of the sub-queue channel data of the section corresponding to about 4 minutes greater than the time is recorded, the data different from the recording data of the control field of the playlist data of the optical disc 10 is recorded. The controller 60 moves the pickup unit 11 to a predetermined specific region of the program area on the optical disc by using the location information of the playlist data previously stored in the memory 61. The unit record data is read from the position (S12). The unit record data is 98 frames of data, of which header data forming one block of sub-coding data (98 x 8 bits) as shown in FIG. There is.

The control unit 60 extracts the header data from the digital data read out from the pickup unit 11 and restored by the digital signal processing unit 50 (S13), and the sub-queue is extracted again from the extracted header data. After extracting the channel data (S14), the recording data of the control field which is a predetermined field of the extracted sub-queue channel data is compared with the recording data of the control field of the stored playlist data corresponding thereto (S15). The authenticity of the optical disc 10 is determined according to whether the data is different. If the recording data in both fields is not the same (S20), the control unit 60 discriminates the inserted optical disc 10 as a genuine disc (S21), otherwise the inserted optical disc 10 is inserted. ) Is determined as a duplicated optical disk, not the original (S30),

In addition, the control unit 60 outputs the determination result to the liquid crystal display unit 70 to visually confirm that the optical disk is illegally copied (S22).

FIG. 5 is a diagram showing the configuration of an entire system equipped with a CD-ROM driver in order to explain the authenticity of the CD-ROM disk containing the program for determining authenticity in a specific area and its operation. The optical disk drive unit A 'of the entire system is configured as a general CD-ROM driver, and a ring buffer 80 for exchanging data with the host is included for connection with the host. .

An external device (PC) connected in signal connection with a driving unit (A ') of the optical disk includes: a memory (110) for storing a line input from the ring buffer (80); A keyboard 130 for receiving a user input; And a central processing unit (CPU) 120 for loading and executing a program from the hard disk 140 at the user's request.

6A and 6B are flowcharts showing the flow of a preferred embodiment of the authenticity determination method of the optical disc according to the present invention made in the entire system of Fig. 5, with reference to the configuration of the embodiment of Fig. 5, Figs. 6A and 6B. The authenticity determination method of the optical disk will be described in detail.

First, a CD-ROM disk containing a program for determining authenticity is inserted and mounted in the optical disk drive unit A '(S30), and the optical disk drive unit A' from the hard disk 140 is inserted. When a driving program is loaded into the memory 110, when a user requests execution of an installation program for installing an application program of an inserted optical disk through the keyboard 130 of an external PC (S31), The CPU 120 requests the driver controller 60 to play and transmit the program through the ring buffer 80.

Accordingly, the control unit 60 controls the pickup unit 11 to read the recorded data on a specific area of the optical disk in which the program to be reproduced is requested, and is read out by the pickup unit 11. Data is signal-processed as described above in the R / F unit 20, the servo unit 40, and the digital signal processing unit 50.

The control unit 60 extracts only pure data included in the installation program, excluding sub-coding areas from the signal-processed recording data, and temporarily stores them in the ring buffer 80, and the stored data are sequentially read out. The memory 110 is transferred to and stored in the memory 110 in the host.

After the data transmission is completed, the stored program is executed by the central processing unit 120 (S32), the program currently running in the host, the optical control unit 60 through the ring buffer 80 Sends a command to read playlist data from the initial playback area (track 0 and track 1) of the disc 10 and transmits it, and the control unit 60 controls the pickup unit 11 according to the command. Read the playlist data recorded in the track 0 and the track 1 on the optical disc 10 (S33), and transmits the read data to the requesting external running program through the ring buffer 80, Upon receiving the playlist data, the executing program sends the pickup section 11 to the control section 60 again through the ring buffer 80, and to the predetermined section on the optical disk (general time of the optical disk). (pause) It is a section corresponding to about 4 minutes greater than the time, and sends a command to move to a start position of a section or file in which a value different from the control field value of the playlist data is recorded in the control field in advance. Then, the control unit 60 controls the pickup unit 11 in accordance with the command to move to the start position of a specific section on the optical disk (S34).

Accordingly, the pickup unit 11 moved to the start position of a specific section on the optical disk repeats the specific section along the track of the optical disk from the position, and the program currently running on the host is the ring. The buffer 80 transmits a command to the control unit 60 to read and transmit sub-queue channel data from the current position on the optical disk of the pickup unit 11.

The control unit 60 extracts the header data from the unit record data read out from the pickup unit 11 according to the command (S35). In this case, the region from which the header data is extracted is in a pause mode. When the control field value is recorded wider than the width of the track repeatedly repeated at the time, it is in an area (approximately four minutes).

The control unit 60 extracts the sub-queue channel data from the extracted header data again (S37), and transmits the sub-queue channel data to the external running program that has requested this through the ring buffer 80, and the execution program receives the received sub-channel. By comparing the recording data of the control field in the received playlist data with the recorded data of the control field in the queue channel data (S38) and checking whether there is a difference between the recording data (S40), the optical disk ( 10 to determine the authenticity (S41, S50).

When the determination result, the optical disk 10 is determined to be authentic, the CPU 120 continues to execute an installation program for installing an application program according to a user's request (S42). If it is not, the information indicating that the mounted disk is illegally copied and a warning message for discontinuing its use is output (S51), and subsequent data processing operations are not performed. Normal execution and the like is stopped (S52).

The optical disc capable of authenticity determination and its discriminating method according to the present invention constituted and constituted as described above includes recording data of a specific field on the reproduction control data area of the optical disc which is not copied so that the inserted optical disc is discriminated as the original. By recording the data as different data from the recording data of a specific field on the playlist data area on the optical disc, it is possible to easily determine whether an arbitrary optical disc is authentic without affecting reproduction and searching, and this program can be used as a true optical disc. It is a very useful invention to prevent the illegal copying of an optical disc that is openly performed by preventing normal reproduction of the optical disc recorded on the disc.

Claims (5)

Reproduction control data recorded in a control field in the sub code queue channel data recorded in the data recording area of the optical disc; An optical disc capable of authenticity determination in which reproduction control data recorded in a lead-in area is recorded as different data so as to correspond to the reproduction control data. The method of claim 1, And the reproduction control data is recorded in an area larger than an area corresponding to a normal pause time of the optical disc. The method of claim 1, And if the reproduction control data are not the same, a program for additionally determining that the optical disc is not genuine is further included. A first step of reading and storing playlist data from a lead-in area of the inserted optical disc; A second step of extracting reproduction control data in the sub code queue channel data recorded in the data recording area of the optical disc; A third step of checking whether the extracted reproduction control data is identical to the reproduction control data included in the stored playlist data; And And a fourth step of discriminating the optical disk as the authentic, if it is not the same. A first step of reading out and executing the installation program recorded on the inserted optical disc; Playback control data recorded in the control field in the sub code queue channel data recorded in the data recording area of the optical disc using the installation program, and playback control data recorded in the lead-in area so as to correspond to the playback control data. A second step of comparing and checking whether is equal to; And And if it is not identical, determining the authenticity of the optical disc roll, and continuing executing the installation program.