KR100275870B1 - Disk capable of restricting copying and the restricting method - Google Patents

Abstract

PURPOSE: A method for restricting a copying is provided to copy a disk by confirming an authentication code composed of one data combination while copying the disk, so as to completely restrict the disk copying. CONSTITUTION: A digital signal is inputted to a controller(100). The controller recognizes an identification code included in an authentication code from a read video signal(102). If the identification code is '0'(102), the controller permits a disk copying and performs the disk copying(114). If the identification code is '1', the controller does not permit the disk copying(112). If the identification code is '2', a disk recording device requests a user to input an authentication code for a disk to be copied(106). If the inputted authentication code is the same as the authentication code of the step '100', the controller permits the disk copying. The controller converts the identification code for preventing the disk copying to '1' as permitting a copying of number '1', and records the converted identification code(110).

Description

Disks with copy restrictions and copy restrictions

The present invention relates to a disc capable of copy restriction and a copy restriction method, and more particularly, to record an identification code and an authentication code of a disc in a predetermined area of the disc and verify the recorded authentication code. The present invention relates to a disk capable of limiting copying and a method of limiting copying.

Digital Video Discs, also known as DVDs, are optical disc recording media that can record not only numbers, letters, figures, voices, and even moving images, but also use digital recording to reduce image quality during repeated playback. It is a very good recording medium without having to worry about it.

Since this DVD has a capacity of about 5.2 GByte (one side), that is, enough to store an existing movie (about 2 hours) even in the case of a moving picture, the DVD can be used for the future video / audio and computer fields. It is expected to be a compatible medium suitable for the coming multimedia age.

And DVD is so much related to the video field that it is actually called a video recording medium. As a result, DVD has enough storage capacity to store one movie on one sheet, and also has various system specifications necessary to satisfy the consumer's desire for playing a video.

A brief overview of this system specification provides a variety of angle screen data storage, 8 audio, 32 language subtitles, and multiple programs for selection and recording of obscene screens from children. Rental lock, etc.

However, in comparison with the function of the DVD, there is no strong method for preventing the data recorded DVD from illegal copying. Moreover, once the disc was copied successfully, the DVD could easily play the disc through ECC signal processing.

This is a structure in which ECC for error correction of playback data used in a general DVD player has a parity of a predetermined size attached to the end of the error correction frame, and the parity information necessary for ECC can be easily found by using this information in the ECC block. . From this, the ECC can be easily corrected for data errors during transmission, data processing, or disk damage, and this error correction is made twice in PI and PO so that the original image can be copied no matter how repeatedly. It provides a great ability to restore your screen.

This error correction capability, of course, provides convenience to the user, but since the error caused by the deterioration of the data caused by the illegal copy of the disk can be reinforced as it is, the original information is restored from the disk due to the illegal copy. By offering the possibility to do so, disk manufacturers are demanding a powerful way to prevent such piracy.

Therefore, although manufacturers for selling movies or audios on DVDs demand powerful methods to prevent illegal copying of discs, current data structures of DVDs suggest ways to prevent them. It is not.

In addition, in recent years, the general household has at least one device capable of playing video discs, and the development of technology enables the playback and copying of video discs using a computer. Therefore, measures to prevent illegal copying are very urgent. It became.

Of course, conventionally, there has been provided a method of recording copy restriction information in a predetermined area of a disc and restricting illegal copy protection based on the recorded copy restriction information.

The conventionally provided copy protection method includes a copy protection signal called a copy generation management system (CGMS) in 20 lines of the video signal. The CGMS is recorded in the header information of all sectors of the file or recorded in the video management information area to limit the copying of sectors or the copying of disks.

In the data area including the CGMS, all 20 bits are configured as digital signals. The 20 bits of the CGMS are CRC recording areas for the error correction area, and the copy protection signal is recorded as 8 bits in the remaining 14 bits. have.

At this time, the copy protection signal recorded is recorded in the form of 00XX, 01XX, 10XX, 11XX. In case of 00XX, copying of disk is allowed unconditionally. In case of 10XX, copying of disk is allowed. . In the case of 11XX, the disk cannot be copied. And 01XX is a reserved area.

Therefore, when copying the disc recorded as described above to the recorder and performing copying, the recorder reads the copy protection signal recorded in a certain area of the disc to determine whether to copy or not, and controls accordingly. Is doing.

That is, conventionally, since only the process of checking the copy protection signal is determined whether the disc can be copied, a person with some knowledge of the system can relatively easily release the copy protection function. There was this.

In addition, the disk area in which the conventional copy protection signal is recorded is composed of 20 bits, and even after removing the 6-bit CRC area for error correction, the 14-bit data area remains. However, since the conventional copy protection signal is made up of only 2 bits, a problem arises in that the use of the data area is inefficient because other areas remain as reserved areas.

It is therefore an object of the present invention to provide a disc for recording an identification code for copy restriction and an identification number of the disc in one data combination in a predetermined area of the disc.

Another object of the present invention is to provide a copy restriction method that can reliably limit the copying of a disk by enabling the copying of the disk by checking an authentication code consisting of one data combination when copying the disk.

1 is a data structure showing that a unique number of a disc and an identification code for copy restriction of a disc according to the present invention are recorded as an authentication code which is a combination of data.

2 is an operation process limiting the copying of the disk according to the verification code confirmation in accordance with the present invention.

3 is a hardware configuration diagram in which signal processing according to FIG. 2 is performed.

According to an aspect of the present invention, there is provided a disc capable of copy restriction, comprising: an identification code according to whether or not to allow copying of a disc, and an authentication code area including disc unique identification information by one data combination; An error correction code area for decoding data recorded in the authentication code area; The information of the authentication code area and the error correction code area is used as copy restriction information when copying a disc.

Disc copy restriction method according to the present invention for achieving the above object comprises the steps of: reading from the disc an identification code according to whether or not the copy of the disc, and the identification code consisting of the disc unique identification information in one data combination; Determining whether the disc can be copied based on the authentication code; When copying of the disk is possible, determining whether the authentication code read from the disk and the authentication code input by the user are the same; When the two authentication codes are the same, it comprises a step of allowing a copy of the disk.

The present invention records the identification code for copy restriction and the identification number of the disk as a verification code by a combination of data in a certain area of the disk, and ensures the illegal copying of the disk by making sure of the verification code when copying. To prevent it.

In particular, the present invention is characterized by efficiently using a data usage area, such as recording an authentication code of a disc in an area where a CGMS signal is recorded.

The authentication code of the present invention is characterized in that it is recorded in 20 lines of the video signal.

The authentication code of the present invention is characterized in that it is made within 20 bits including the CRC.

The present invention is characterized in that after the copy of the disc by the verification of the authentication code, the identification code for copy protection is converted and recorded so that no further copying is possible.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a copy limiting disc and a copy limiting method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a data structure showing that an identification number of a disc and an identification code for copy restriction of a disc according to the present invention are recorded as an authentication code which is a combination of data. That is, the authentication code described in the present invention means a code in which the identification number of the disc itself and the identification code for copy restriction of the disc are combined into one.

That is, the data structure according to the present invention converts the 20-line video signal into 20-bit digital data when the disc is reproduced, as shown in FIG. The converted digital data is composed of 6 bits of CRC for error correction and 14 bits of authentication code.

The 14-bit authentication code configured at this time is defined as shown in FIG. 1 (b).

That is, as shown in FIG. 1 (b), 0X0XXX is set to a code that allows copying of the disk. 0X1XXX is a code which does not allow copying of the disk, and a code which allows one copy from 0X2000 to 0X2FFF is set. 0X3000 to 0X3FFF are set to the reserved area.

To distinguish the data, "0, 1, 2, 3" is an identification code for the presence or absence of a copy of the disk, the data of the subsequent stage including the identification code is implemented as an authentication code. That is, in the present invention, the identification code and disc unique number for detecting the copying of the disk are made by one data combination. Therefore, the combined authentication code is assigned to one disc one by one.

Therefore, if the identification code is “0X0XXX”, copying is allowed unconditionally, so the operation such as checking the authentication code is unnecessary when copying the disk. In addition, when the copy existence identification code is "0X1XXX", since copying is impossible unconditionally, it is unnecessary to confirm the authentication code.

However, if the copy existence authentication code is "0X2XXX" or "0X3XXX", it is necessary to check the authentication code when copying the disc. That is, when copying the disc, if the copy existence identification code is "2" or "3", the recorder needs to read the authentication code and confirm with the authentication code input by the user. The description of this part will be described in more detail in FIG.

The code set here is described by way of example and can be set differently. Just as in the present invention, if the identification code for confirming the copy and the unique number of the disc is recorded in the 14-bit data area, it will be possible to implement the authentication code required by the present invention.

2 is a flowchart illustrating the operation of limiting copying of a disc on which an authentication code is recorded according to the present invention. 3 is a hardware configuration diagram in which signal processing according to FIG. 2 is performed.

The disc copy limiting operation of the present invention is performed when a disc is copied between the disc reproducing apparatus 10 where the disc is reproduced and the disc recording apparatus 20. First, after the disc is mounted in the disc reproducing apparatus 10, the video signal 20 lines are read using data reading means (not shown) such as pickup. At this time, the read data is subjected to a predetermined signal processing by a signal processing unit (not shown), and then converted into a digital signal and output from the disc reproducing apparatus 10, and the output digital signal is a control unit of the disc recording apparatus 20 ( 25) (step 100).

The control unit 25 of the disc recording apparatus 20 first recognizes an identification code for preventing illegal duplication of the disc included in the authentication code from the video signal read out (step 102).

When the identification code for copy protection of the disc recognized in step 102 is "0", the control unit 25 performs copying of the disc mounted in the disc reproducing apparatus 10 while allowing the disc to be copied. Step 114).

When the identification code for copy protection of the disk recognized in step 102 is “1”, the controller 25 does not allow copying of the disk and does not allow copying of the disk (step 112).

In addition, when the identification code for copy protection of the disc recognized in step 102 is "2", the disc recording apparatus 20 requests the user to input the authentication code of the disc to be copied (step 106).

When the authentication code input in step 106 is the same as the authentication code loaded in step 100, the controller 25 allows copying of the disc mounted in the disc reproducing apparatus 10. FIG.

On the other hand, as shown in Fig. 1 (b), when the identification code for copy protection of the recognized disk is “2”, since one copy is allowed, the user allows one copy while simultaneously copying from thereafter. The identification code for copy protection of the disk included in the authentication code is converted to “1” so that the recording is impossible (step 110).

That is, step 110 is a step of changing the authentication code for the next copy protection while allowing the copy when the authentication code reproduced from the disc and the authentication code input by the user are the same. Therefore, in the case where the confirmed authentication code allows two copies, the authentication code is changed to an authentication code indicating that the copy can be made once when the first copy is performed, and the authentication notifying the copy is impossible when the second copy is performed. It may be possible to change it back to code.

As described above, the present invention uses an authentication code which is copy protection information input when a disc is copied. If the authentication code entered into the recorder is 0X0XXX, copying is allowed. If the authentication code entered into the recorder is 0X1XXX, copying is disabled. In addition, if the authentication code input to the recorder is 0X2XXX, only one copy is allowed, and then the authentication code is changed. That is, when the authentication code entered by the user and the authentication code recorded on the disk is the same, one copy is allowed, and then the authentication code is changed to 0X1XXX so that the copy is impossible.

As described above, the copy-restricted disc and the copy-restriction method according to the present invention use a verification code recorded on 20 lines of a video signal to input 'authentication code' when copying, instead of judging only the presence or absence of copying. There is an advantage that more reliable copy protection can be achieved.

Claims (7)

An identification code according to whether or not the copy of the disk is allowed, and a copy restriction code for displaying the identification information of the disk as an authentication code based on one data combination, and for determining whether to permit copying of the disk by the authentication code. 2. The copy restriction code according to claim 1, wherein the identification code includes copy permission or copy number allowed. The copy restriction code according to claim 1 or 2, wherein the authentication code is comprised of 14 bits or less. An authentication code area comprising an identification code according to whether a copy of a disc is allowed and a disc unique identification information by one data combination; An error correction code area for decoding the data recorded in the authentication code area, and copying information characterized in that the information of the authentication code area and the error correction code area is used as copy restriction information when copying a disc. 2 disks available. Reading an identification code according to whether the disk is allowed to be copied and an authentication code composed of one data combination of the disc unique identification information from the disk; Determining whether the disc can be copied based on the authentication code; When copying of the disk is possible, determining whether the authentication code read from the disk and the authentication code input by the user are the same; A method of restricting copying of a disk, comprising the step of allowing copying of the disk when the two authentication codes are identical. 6. The method of claim 5, wherein allowing copying of the disc comprises: Determining the number of times the disk can be copied from the authentication code; A method of restricting copying of a disk, comprising changing an identification code of an authentication code when copying a disk. An identification code according to whether or not a copy of a disk is allowed, and a unique code for identifying a disk as an authentication code based on a combination of data, and the copy restriction coding method for judging whether or not the copy of a disk is allowed by the authentication code.

Images