KR100304406B1 - Authenticated optical storage media and methods of making and identifying them - Google Patents

Abstract

According to the present invention, the error data is recorded in the unit recording data (ECC Block) on an arbitrary area of the optical storage medium so that the error correction capability is higher than that at the time of reproduction. The authenticity of the inserted optical storage medium is determined by using a reproduction error occurring in the system, and in some cases, the subsequent data processing operation of the optical storage medium is stopped to prevent illegal copying of the optical storage medium (Anti The present invention relates to an optical storage medium capable of authenticating a true copy and a method of manufacturing and discriminating the same, wherein the authenticity determining method of an optical storage medium according to the present invention reproduces recorded data from a specific region of an optical storage medium having been inserted. The first step to do; A second step of checking whether a restoration error corresponding to a predetermined condition occurs in the reproduced record data; And a third step of discriminating the inserted optical storage medium as the original according to the checking result, preventing copying of the optical storage medium by a normal copying device, without affecting the reproduction of the optical storage medium. It is possible to easily determine whether the inserted optical storage medium is duplicated, and by recording such a copy discrimination program on the original optical storage medium, it is possible to prevent normal reproduction of the copied optical storage medium, thereby illegally making the optical storage medium publicly performed. It is a very useful invention that can prevent duplication.

Description

Optical storage media capable of authenticity determination and its manufacture and discrimination method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical storage medium capable of authenticity determination and a method for manufacturing and discriminating the same. More particularly, the error data in the unit recording data (ECC Block) on an arbitrary area of the optical storage medium has an error correction capability at the time of reproduction. Recording is carried out, and whether or not the inserted optical storage medium is authentic is judged by using a reproduction error occurring when the unit recording data of the corresponding area is reproduced. The present invention relates to an optical storage medium capable of authenticating the anti-piracy of an optical storage medium by interrupting subsequent data processing operations of the medium, and a method of manufacturing and discriminating the same.

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 optical storage medium is repeatedly detected, there is no friction with the medium when recording is detected. Therefore, the signal quality is the same as the original and the information preservation performance is excellent. There was an advantage,

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. The optical storage media can be cloned, and a large number of illegal copy companies produce and distribute the same optical storage media by using a read-only disk production apparatus.

As a result, the software industry has suffered enormous losses due to piracy and has been a cause for depressing software developers' enthusiasm. As a result, regulations on the duplication of optical storage media are intensifying, but personal or covert piracy is blocked. Since it is difficult to do so, the identification of the original of the optical storage medium and the copy protection technology using the same have emerged as the main solutions in the field of the optical storage medium.

Therefore, various methods have been proposed to prevent illegal copying of optical storage media as described above, and one of the methods described by the present applicant is "a method of recording a signal of a copy preventing optical disk and an optical disk copy using the recording method. The "protection method" has been filed in Patent Application No. 97-32576. The signal recording method of the optical disk for copy protection proposed by the present invention and the copy protection method of the optical disk using the recording method are provided in a predetermined area on the optical disk. One bit of a specific standard symbol or code word 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 during reproduction. ) Was played with two standard symbols, from which the optical disc was identified as authentic.

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, one bit of a specific standard symbol or code word is moved to a predetermined area on the optical disk. Since accurate recording is required in an undefined area on the optical disc (the area between the pit and the pit not within the tolerance range of the defined pit), much precision is required to control the amount of delay of the recording pit. In order to provide a high cost, this increases the manufacturing cost of the optical storage medium, whereas in the case of using an optical disc manufacturing equipment of low precision, one abnormal symbol is reproduced when the original optical disc is produced. Problems occur that do not determine the original because they are played back only with standard symbols. It comes to life.

In addition, because a large number of manufacturers manage the indeterminate area according to the characteristics of the driver, even if using expensive equipment that precisely processes the pit delay amount, the specific symbol among the drivers having different indeterminate areas may have abnormal symbols when playing the original disc. It can be reproduced with only one standard symbol because it does not belong to the indeterminate area. If delayed data is reproduced with only one symbol, a problem may arise that the inserted optical disc is incorrectly identified as a duplicate even though the inserted optical disc is authentic.

Accordingly, the present invention was devised to solve the above problems, and by recording one or more unit data in an arbitrary area on the optical storage medium so that error correction does not always occur at the time of reproduction, the true optical storage medium can be easily made. The purpose of the present invention is to provide an optical storage medium capable of authenticating the authenticity and a method of manufacturing and discriminating the authenticity thereof.

Figure 1 shows the configuration of a preferred embodiment of the apparatus for manufacturing an optical storage medium capable of authenticity determination according to the present invention,

2 shows the form of a recording frame including an error correction unit block (ECC Bloock) encoded by a CIRC encoder.

Fig. 3 shows the form of an encoded error correction unit block in which an error code is inserted beyond the error correction capability at the time of reproduction;

4 shows a part of the EFM conversion table;

5 illustrates a part of a process of manufacturing an optical storage medium,

FIG. 6 illustrates, for example, the form of C2 and C1 Code columns for generating and recording error data on a test area of an optical storage medium capable of authenticity determination according to the present invention.

Figure 7 shows the configuration of another embodiment of the apparatus for manufacturing an optical storage medium capable of authenticity determination according to the present invention,

FIG. 8 is a diagram showing the configuration of an entire system equipped with a CD-ROM driver for explaining the authenticity of the optical storage medium and the operation thereof.

FIG. 9 shows a flow of a preferred embodiment of the authenticity determination method of the optical storage medium according to the present invention made in the overall system of FIG.

※ Explanation of code for main part of drawing

1: Cross Interleave Reed-Solomon Code (CIRC) encoder

2, 7: Error data generator 3: Multiplexer (MUX)

4: EFM (Eight to Fourteen Modulation) Modulator

5: mastering device 6, 160: control unit

10: optical storage medium (storage) 100: optical storage medium driving unit

110: pickup section 120: R / F section

130: beat restorer 140: EFM demodulator

150: CIRC decoder 170: ring buffer

200: host 210: central processing unit (CPU)

220: memory 230: video adapter

240: hard disk (HD)

An optical storage medium capable of authenticity determination according to the present invention for achieving the above object includes unit data corrected and recorded with an error code including an error correction capability at the time of reproduction in an error correction unit block, and the error correction unit The feature is that at least one block is recorded in a predetermined area.

The optical storage medium capable of authenticity determination as described above includes an input recording data and generates an error correction unit block for the first data, and selects unit data of more than error correction capability during reproduction from the generated error correction unit blocks. After generating the error data for this, the genuine optical storage medium is produced by selectively inserting the generated error data into the generated error correction unit block and recording it in a predetermined area on the optical storage medium.

Also, within the error correction unit block normally generated by the recording data, unit data of more than error correction capability at the time of reproduction is selected, and the selected unit data is replaced with an error modulation value instead of a corresponding modulation value. By recording in a predetermined area, a genuine optical storage medium can be produced.

In the authenticity determination method of the optical storage medium manufactured as described above, the recording data is read out from the specific region of the inserted optical storage medium, and the predetermined condition, i.e., the position at which the reproduction error occurs, It checks whether a restoration error occurs corresponding to the number of times. As a result of the check, when a restoration error that meets a predetermined condition occurs, the inserted optical storage medium is determined as the original.

Hereinafter, exemplary embodiments of an optical storage medium capable of authenticity determination and a method of manufacturing and determining the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows a configuration of a preferred embodiment of an apparatus for manufacturing an optical storage medium capable of authenticity determination according to the present invention, comprising: a Cross Interleave Reed-Solomon Code (CIRC) encoder 1 for error correction encoding input data; An error data generator (2) for converting unit data (meaning one symbol data before or after conversion) of the error correction unit block having an error correction capability at the time of reproduction into error data among the encoded error correction unit blocks (ECC Block); A multiplexer (MUX) 3 for selectively combining and outputting the error correction code and the generated error data; An EFM (Eight to Fourteen Modulation) modulator (4) for modulating the encoded 8-bit data into 14-bit data; A mastering device (5) for recording the modulated data onto an optical storage medium; And a control unit 6 which controls the error data generator 2 at any point in time according to the input data sequence to generate error data for unit data in a specific error correction unit block.

In the optical storage medium manufacturing method of the optical storage medium manufacturing apparatus that can determine the authenticity according to the present invention configured as described above, first, in the CIRC encoder 1, Reed Solomon coded by two units of C2 encoder and C1 encoder The C2 encoder C2 generates and encodes 4 symbols of parity for the 24 unit data input, and the C1 encoder C1 aligns the code data of the 28 symbols encoded by the C2 encoder C2. In order to increase the number of columns, one unit data is selected for each row, and 4 symbols of parity for 28 symbols are generated and encoded.

As described above, the CIRC encoder 1 encodes the input data to output the error correction unit block of FIG. 2, and the controller 6 records the encoded error correction unit block in the test area on the optical storage medium. In the case of authentic data to be verified, the error data generator 2 is controlled to output unit data of three predetermined positions, for example, the twelfth, as shown in FIG. The symbol, the 24th symbol, and the 32nd symbol are selected and converted into error data. The reason for selecting three unit data in the error data generator 2 is that the parity (P) is four, the minimum error correction distance is 5 (d _min = P + 1), the three errors are error correction capability This is because it becomes an ideal. As described above, the unit data converted into error data is inserted into and output at the corresponding position in the normal error correction unit block output from the multiplexer 3.

As shown in FIG. 5, the position of the error unit data to be inserted into the finally output error correction unit block is equal to or greater than three error positions on each C1 code stream, and also in the row of the C2 code stream. By selecting three or more, it is possible to prevent restoration to normal data by sequential error correction of the C1 code and error correction of the C2 code during reproduction.

The EFM modulator 4 converts the 8-bit unit data in the combined data, that is, the error correction unit block including the error data, into 14-bit unit data that is scheduled to be corresponding thereto. The data conversion of the EFM modulator 4 is made based on the EFM conversion table shown in FIG.

The mastering device 5 produces a stamper for the data of the recording format converted into 14 bits, and the resin is cured by ultraviolet rays between the plastic plate and the stamper on which the image data is to be recorded. After filling with (Fig. 6 (a)), when the resin is cured by the ultraviolet rays from the plastic sheet (Fig. 6 (b)), the error data is included in the form of Fig. 5, which is impossible to correct the correction in a specific area. The at least one error correction unit block is written in the test area, and other recording data is recorded in the data area (program area), and the mastering device 5 is stored in the data area except the test area. A program for detecting an error of the reproduction data recorded in the test area of the optical storage medium and determining whether the optical storage medium is authentic and performing the operation accordingly By rock, it is an authentic optical storage medium to be produced ((c) in Fig. 6).

In this manner, the reflective film is formed on the optical storage medium in which data of various forms (music, video, program) is recorded, and when the reflective film is completed, the protective film is coated so that the film is not oxidized. This ratio is to be completed.

FIG. 7 illustrates a configuration of another embodiment of an apparatus for manufacturing an optical storage medium capable of authenticating according to the present invention, which is a predetermined position in an error correction unit block converted from 8 bits to 14 bits, that is, as shown in FIG. The error data generator 7 which converts the unit data (14-bit data) at the designated position of each C1 code string to be other modulated data other than 14 bits corresponding to the input 8 bits is different. It is the same as the structure of FIG.

In another method of manufacturing an optical storage medium, which is performed in the apparatus for manufacturing an authentic optical storage medium according to the present invention configured as described above, first, the input data is an error correction unit in the CIRC encoder 1 as described above. It is coded into blocks and converted into 8-14 bits by the EFM modulator 4.

The controller 6 controls the error data generator 7 to output the 8-14 bit EFM conversion output when the encoded error correction unit block is authentic data to be recorded in a test area on an optical storage medium. In the error correction unit block, the unit data of the designated position, for example, the twelfth symbol, the twenty-fourth symbol, and the thirty-second symbol of the position as shown in FIG. 5, is selected and converted into error data. The error data conversion at this time is performed by selecting a value that does not exist in the EFM conversion table or by replacing it with another modulation value instead of the corresponding conversion value.

The multiplexer 3 selectively inserts the conversion error data into the designated position in the 8-14 bit converted error correction unit block to generate and record the converted error correction unit block as shown in FIG. In other ways, the true optical storage medium is produced.

However, in the duplication apparatus for copying the recording data in the genuine optical storage medium manufactured as described above, at least one error that cannot be corrected in the error is recorded in the test area of the genuine optical storage medium when the recorded data is to be read and copied. When decoding the correct unit block, there is no way to decode the unit block for a particular drive, which causes a read error of the optical storage medium and stops the reading process. You will not be able to duplicate it.

In the case of a drive that outputs an error as it is, a parity suitable for the output error signal is inserted and recorded as normal data, and when it is reproduced, the normal data is always read and a copy is recognized.

FIG. 8 illustrates the configuration of the entire system equipped with the optical storage medium driver 100 in order to determine whether the optical storage medium manufactured by the above process is true and the operation thereof. FIG. The driving unit 100 includes a pickup 110 for reading a recording signal by injecting a light source into the optical storage medium 10; An R / F unit 120 for filtering the signal detected by the pickup unit 110; A bit recoverer (130) for detecting a synchronous signal from the output analog signal of the R / F unit (120) and restoring the bit stream from the recording pits; An EFM demodulator (140) for demodulating a 14-bit signal into an 8-bit signal in the bit stream; A CIRC decoder 150 for performing error detection and correction on the demodulated data in error correction block units; A ring buffer 170 for transmitting the error corrected data to the host; And a control unit 160 for controlling the pickup unit 110 to read a recording signal on the optical storage medium.

In addition, an external device (Host) connected in signal with the optical storage medium driving unit 100 includes: a central processing unit (CPU) 210 for loading and executing a program from the hard disk 240 according to a user's request; A memory 220 for receiving and storing a program recorded in a specific area of an optical storage medium through the ring buffer 170; And a video adapter 230 for converting information to be transmitted to a user into a video signal and outputting the video signal to a monitor.

9 is a flow chart showing the flow of a preferred embodiment of the optical discriminant determination method of the optical storage medium according to the present invention in detail with reference to the configuration of the entire system of FIG. Explain.

First, in the optical storage medium driving unit 100, an uncorrectable error correction unit block is recorded in a specific area in a test area in a predetermined number, and a program for determining whether the optical storage medium is authentic through this is stored together. After the genuine optical storage medium is inserted and mounted (S10), the central processing unit in the state in which a driver program of the optical storage medium driving unit 100 is loaded into the memory 220 from the hard disk 240, When the user requests the execution of a program stored in a specific region of the inserted optical storage medium through the device 210 (S11), the CPU 210 controls the controller 160 in the driving unit 100. Will request to play and send the program. Accordingly, the controller 160 controls the pickup unit 110 to read a program recorded in a specific area on the optical storage medium, and the data read by the pickup unit 110 is read by the R /. After filtering by the F unit 120, the original program data recorded through the bit decompressor 130, the EFM demodulator 140, and the CIRC decoder 150 is restored to the host through the ring buffer 170. Is transferred to the memory 220.

After the data transmission is completed, the authenticity check execution routine included in some routines of the stored program is executed by the central processing unit 210 (S12), and the central processing unit 210 In order to determine the authenticity of the inserted optical storage medium, the driving unit generates a control command that reads and reproduces test data recorded in a test area whose location is designated on the authenticity checking execution routine and transmits it to the host. It transmits to the control unit 160 of (100). Accordingly, the controller 160 controls the pickup unit 110 to sequentially read a plurality of error correction unit blocks, which are test data recorded in a test area of the optical storage medium (S13). The plurality of error correction unit blocks to be read are filtered by the R / F unit 120 and then converted into a digital bit stream by the bit decompressor 130.

Then, the EFM demodulator 140 the digital conversion of the symbol data of 14 bits is input and output to the demodulation symbol data of 8 bits (S14), C1 decoder in the CIRC decoder (150) (C1 ^-1) is a Among the five types of recorded data, error data should be detected from the C1 codes 32 and 28 sequentially read out and restored to the original normal data (S15). ), It does not restore the original normal data and outputs it as it is.

If the C1 decoder (C1 ^-1) C1 code sequence outputted from the CIRC decoder will be sequentially inputted to the buffer in 150 is temporarily stored is presented, a predetermined amount of the C1 code sequence is complete, save to eliminate the parity, C2 decoder (C1 ^-2) is to be the C1 code which is stored in the buffer is read out by the C2 code (28,24) made up of the inclined form of the data and restore it to the original data of the normal, the error is restored from the C1 decoding process, In this case, error unit data with error correction capability (three symbols) still exists in the C2 code string, so that it cannot be restored to the original normal data, and a read error state value is transmitted through the ring buffer 170. do.

In the above embodiment, an error in which at least three symbol data are converted into other data and recorded at a predetermined position of the error correction unit block in which the error data is 8-14 bits converted, that is, a position as shown in FIG. Even in the case of a correction unit block, if the error data does not exist in the EFM conversion table, the EFM demodulator 140 demodulates and outputs the error data (14 bits) into the most similar 8-bit signal. In case of conversion, inverse conversion is performed to an 8-bit value other than the original 8-bit value. Since 8-bit data EFM demodulated in this manner is also error data, as described above, error correction is not performed in the CIRC decoder 150. The read error status of the error correction unit block in the area is output to the host.

Accordingly, the program currently being executed on the host, grasps the data read state value input from the CIRC decoder 150 of the driver 100, and performs a predetermined number of times and a predetermined condition such as a predetermined interval. If it is confirmed that the error occurs (S20, S21), from this it is determined that the optical storage medium inserted into the drive unit 100 as a genuine optical storage medium (S22).

The central processing unit 120 performs a data processing operation after execution of an installation program recorded on the optical storage medium in response to the user's request, if the inserted optical storage medium is determined to be authentic. (S23), if it is determined that the inserted optical storage medium is a duplicated optical storage medium (S30), the information indicating that the inserted optical storage medium has been illegally copied and warns to stop using the same. The message is output to the monitor through the video adapter 230 (S31), and the subsequent execution of the data processing operation is interrupted, thereby stopping the normal execution of the optical storage medium program due to illegal copying (S32).

On the other hand, in the above embodiment, audio CDs and CD-ROMs that record data by converting 8-14 bits (EFM) are described, but the same applies to DVDs (Digital Versatile Disks) that convert data by 8-16 bits. .

The optical storage medium capable of authenticity determination and its fabrication and discrimination method according to the present invention constituted and constituted as described above have errors in reproducing error data such that the optical storage medium inserted in the test area of the optical storage medium is discriminated as authentic. By recording for identification in the test area beyond the correction capability, it is possible to prevent duplication of the optical storage medium by a normal copying device and to easily determine whether the inserted optical storage medium is duplicated without affecting the reproduction of the optical storage medium. In addition, by recording such a copy discrimination program in the original optical storage medium, it is a very useful invention that prevents the illegal copying of the optical storage medium that is openly performed by preventing normal reproduction of the duplicated optical storage medium.

Claims (5)

An optical storage medium capable of authenticity determination in which unit data corrected and recorded by an error code is included in an error correction unit block or more at the time of reproduction, and wherein at least one error correction unit block is recorded in a predetermined region. In the manufacturing method of the optical storage medium, Generating an error correction unit block for the recorded data; A second step of selecting unit data from the generated error correction unit blocks so that the error correction capability is greater than or equal to the error correction capability during reproduction; And And a third step of recording the record data including the corrected error data in a predetermined area on the optical storage medium. The method of claim 2, The corrected data is ECC (Error Correction Code) error, characterized in that the authenticity of the optical storage medium can be determined. The method of claim 2, And the error data to be corrected are EFM (Eight to Fourteen Modulation) errors. A first step of reproducing the record data which cannot be error-corrected from a specific region of the inserted optical storage medium; A second step of checking whether a restoration error corresponding to a predetermined condition occurs in the reproduced record data; And And a third step of discriminating the inserted optical storage medium as the authentic according to the verification result.