KR20010069577A - Copy protected optical disc manufacturing method and optical disc therefrom - Google Patents

Abstract

PURPOSE: A copy protect optical manufacturing method and an optical disk thereby are provided to protect a copy and an operation of a copied optical disk, and to finish all processes for a copy protect in a manufacturing process by inserting OHD(Optical Head Ditching) data into a specific region of the optical disk, and to increase a reliability of the copy protect by combining a copy protect hardware of the optical disk and an encryption and authentication technology software. CONSTITUTION: Under a pre-mastering process, a formatting work for inserting an OHD(Optical Head Ditching) information layer, a driving program, and a production identifier is performed(102). At this time, the OHD information layer includes the location information of a sector pertinent to a next read OHD region and the location information of a sector where next read valid data are stored, and the driving program is distributed and stored at the OHD information layer, and the production identifier identifies a content. Next, under a mastering process, a stemper is made by using the formatted signal(104). At this time, the stepper includes more than one OHD region in which a tracking of optical beam is impossible in the time of playback of the optical disk inside an optical disk playback device. Through this process, an OHD data block is built up, and not only a valid data block but also the OHD data block are written on a disk original plate by a laser cutting. After this, a pressing work is performed by using the stemper, and the pressed disk is bonded, and finally a copy protect optical disk is manufactured(106).

Description

Copy protected optical disc manufacturing method and optical disc therefrom

The present invention relates to a method of manufacturing a copy-protected optical disc and a disc thereof, and more particularly, to a method of manufacturing a copy-protected optical disc having an optical head ditching (OHD) area which cannot be normally read by an optical disc recorder. It's about that disk.

In general, various disks such as optical disks are used to store various types of information in various formats. Recently, CD-R, CD-RW, DVD-R, DVD-RW. And recordable optical discs, such as DVD-RAM and the like, have become commercially and popularly spreading, so that optical discs are being used as personal auxiliary memory memory means. Moreover, as the technology related to the optical disc is developed, the use of a large capacity DVD (DVD) has become common.

In addition, in the past, optical disc devices generally played a role of distributing large-capacity contents as a play-only type device, but recently, as recordable optical disc-related devices have become popular, they have become an important auxiliary memory device. I'm going. However, as the recordable optical disc device is widely used personally, there is a problem that such an optical disc device can be used as a tool for illegal copying.

In addition, since the duplication using the recordable optical disc device is basically based on digital duplication, the signal of the duplicated disc is not deteriorated or deformed compared to the original disc signal. Therefore, the duplicated disc has almost the same quality as the content or file of the original disc, thereby causing a serious damage to the content developer and the original disc manufacturer.

Moreover, the recent rapid development of various hardware or software capable of copying is expected to cause serious economic and social problems due to illegal copying and distribution of disks. Therefore, there is a need for an appropriate copy protection technology that can prevent such illegal copying at the source.

On the other hand, the recordable area of a general recordable optical disc is divided into a plurality of sectors. Each sector is assigned a fixed logical block address (LBA) regardless of whether data is recorded or not. An optical disc apparatus that reads data recorded in an optical disc reads a logical address from the optical disc, and enters and reads a beam therein while traveling the tracks of the optical disc. At this time, the intensity of the reflected light is large on the mirror surface without pit in each track of the disk, while the intensity of the reflected light is small on the pit of the track. The optical pickup converts the difference in intensity of the light reflected from the optical disc into an electrical digital signal, and extracts meaningful information by decoding the sequence of the converted digital signal. Incident of the optical beam into the written pit and detection of the light beam reflected from the recording pit is performed by optical pick-up. At this time, the optical pickup not only detects the difference in the intensity of the reflected light and converts it into electrical digital data, but also the electric signal obtained by detecting the difference in the intensity of the reflected light in order to control the rotation speed of the optical disc. send it to the sled servo.

In order for data contained in an optical disc to be read normally, three conditions must be satisfied. Firstly, logical block address values assigned to sectors in data blocks recorded in the optical disc are incremented sequentially, and the size of the file converted by the logical block address values is used in a computer system linked to the playback apparatus. Do not exceed the maximum size of files supported by the operating system. Secondly, the optical pickup of the optical disc reproducing apparatus must be able to continuously run the track by determining the center of the track consisting of a series of recording pits. Thirdly, the servo must be normally controlled by sending servo signals of EFM (Eight to Fourteen Modulation) data read from the pit recorded along the track to the spindle servo of the optical disc drive. do. Most optical disc devices and optical discs are manufactured according to physical standards satisfying the above conditions.

According to the conventional copy protection technology, data encryption is performed using encryption software in an optical disc that satisfies the above physical standards. However, this copy protection technique can cause compatibility problems in which the pre-mastering or mastering process is complicated and the original disk does not run on certain driving devices. In addition, according to the copy protection method, if the encryption algorithm is hacked at least once, there is a problem that the replication is easily performed.

The technical problem to be achieved by the present invention is to duplicate the computer software or digital content contained in the original optical disk using a recordable optical disk device such as a CD-R, CD-RW, DVD-R, DVD-RW and DVD-RAM drive. There is provided a method of manufacturing a copy-protected optical disc which is impossible.

Another object of the present invention is to provide a copy-protected optical disk manufactured by the optical disk manufacturing method.

1 is a flowchart showing main steps of a method of manufacturing a copy protected optical disc according to an embodiment of the present invention.

2 is a view for explaining the structure of the OHD data block.

3 is a view for explaining the structure of the optical disk that can not be duplicated according to the present invention.

4 is a view for explaining the structure of a file including an OHD region.

5 is a structural diagram showing an address discontinuity point of a disc.

6 is a flowchart illustrating a method of reading a non-replicable disc and determining a duplicate disc according to the present invention.

In order to achieve the above technical problem, a method of manufacturing a copy-protected optical disc according to the present invention includes (a) at least one or more predetermined O Hs, in which an optical beam cannot be tracked during playback in an optical disc reproducing apparatus between regions corresponding to contents. And inserting an optical head ditching (OHD) region.

Further, the predetermined Oetchdi region preferably includes successive pits in which the difference in reflectance of the light reflected from the pits is below a predetermined threshold.

Alternatively, the predetermined Oetchdi region more preferably includes a mirror region in which no pits are formed.

The predetermined Oetchidi area preferably includes an Oetchidi information data area in which a start address of a sector corresponding to the next Oetchidi area to be read is recorded.

The predetermined Oetchidi area preferably includes an Oetchidi information data area in which position information of a sector in which valid data to be read next is stored is recorded.

In the step (a-1), during the premastering process, step (a-1) includes Oetchidi information including position information of a sector corresponding to the next Oetchi region to be read and position information of a sector storing valid data to be read next. Performing formatting to insert a layer, a drive program distributed and stored in the Oetchidi information layer, and a production identifier identifying content; (a-2) during the mastering process, using a formatted signal to create a stamper comprising one or more predetermined Oetchi regions in which the optical beam cannot be tracked during playback in the optical disc player; And (a-3) pressing using a stamper.

In addition, the step (a-1) may include (a-1-1) scrambling a logical block address indicating a position of a sector allocated to the OHD region.

In addition, in order to achieve the above technical problem, the copy-protected optical disc according to the present invention includes at least one or more OHD areas in which the optical beam cannot be tracked during playback in the optical disc player between the areas corresponding to the contents; It is characterized by including.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating main steps of a method of manufacturing a copy protected optical disc according to an embodiment of the present invention. In this embodiment, a DVD (digital versatile disc) disc will be described as an example. Referring to FIG. 1, according to the copy-protected optical disc manufacturing method according to an embodiment of the present invention, first, during the premastering process, position information of a sector corresponding to an Oetchi region to be read next and valid data to be read next are stored. Formatting is performed to insert an Oetchidi information layer containing the position information of the sector, a drive program distributed and stored in the Oetchidi information layer, and a production identifier identifying the content (step 102).

Next, during the mastering process, a formatted signal is used to create a stamper comprising one or more predetermined Oetchi regions that cannot be tracked in the optical beam during reproduction in the optical disc reproducing apparatus (step 104). In this process, an Oetchidi data block is generated, and the Oetchidi data block formed by the Oetchidi region together with the valid data block is recorded on the disc disc by laser cutting. The recorded disc disc is stamped. Now, a copy-protected optical disc is manufactured by pressing using a stamper and bonding the pressed disc (step 106).

Hereinafter, a process of manufacturing a copy-protected disc by inserting OICHDI information into the original DVD file will be described in more detail. For example, the original file consists of 10 blocks. In this embodiment, 10 blocks of Oetchidi blocks are inserted every two blocks of the original file. The Oetchidi block consists of 3 blocks of Oetchidi information data blocks, 4 blocks of physical Oetchidi blocks, and 3 blocks of Oetchidi information data blocks. The physical Oetchdi block consists of a mirror area in which no pits are formed. Alternatively, it is also possible to include successive pits whose difference in reflectance of the reflected light from the pits is below a predetermined threshold at which tracking of the light beam is impossible.

FIG. 2 is a diagram for explaining the structure of OHD data block. The data structure shown in FIG. 2 corresponds to one sector 22. Sixteen sectors form one OHD data block. Referring to FIG. 2, the OHD data includes a header field (Header filed), an ID field 244, a current block display field (Curr. Block Ind. 246), an address information field 248 (A. Info), and the following. A Next OHD layer Start Address (250), a Next Effective Data Start Address (252), and a Reserved Field (254). In addition, driving programs are distributed in the data area 260 of the OHD data block. Further, an ID required for the execution of a drive program of the optical disc drive device can be inserted into the data area 260 in the OHD data block.

Through the processes described with reference to FIGS. 1 and 2, an optical disk capable of copying according to the present invention is manufactured. 3 shows an example of a structure inside the optical disc that is not replicable according to the present invention. Referring to FIG. 3, a physical and artificial error structure is formed in a predetermined region 31 in the non-replicable disk 30 according to the present invention. That is, the Oetchidi area 32 which is inaccessible by the general optical disk device as described above is formed. The Oetchidi area 32 logically corresponds to an Oetchidi block. Regions 322 and 324 correspond to Oetchidi information data blocks, and region 326 corresponds to physical Oetchidi blocks. In this embodiment, the physical Oetchidi block is composed of a mirror region in which pits are not formed. Alternatively, the physical Oetchidi block can also consist of successive pits whose difference in reflectance of the reflected light from the pits is below a predetermined threshold at which tracking of the light beam is impossible. Alternatively, it is also possible to construct continuous pits with lengths that do not meet the specifications. The valid data area that can be normally accessed is formed next to the Oetchidi area 14 that is not normally accessible as described above. The Oetchidi area and the effective data area are formed repeatedly and alternately with each other. The OHD data block corresponding to the areas 322 and 324 as described above is called dummy data because it is not valid data that is content. That is, dummy data including address information of the next read sector is stored on the inner and outer circumferential sides of the physical OHD block corresponding to the area 326. In addition, the dummy data contained in the optical disc transfers the virtual data capacity to the operating system of a computer connected to the optical disc reproducing apparatus, thereby allowing the operating system to be a disc whose size of the duplicated disc is considerably larger than the original data size of the original disc. Recognize. If the size of a file stored in the copied optical disc is recognized as 4 gigabytes, the file cannot be recognized using an operating system of a 32-bit computer.

The file stored in the optical disc having the above physical structure has a structure as shown in FIG. It is assumed that the structure of the file is read sequentially from the inner circumference to the outer circumference. As shown in Fig. 4, in the file, an Oetchidi information data field 402, an Oetchidi field 404, and an Oetchidi information data field 406 are recorded before the valid data field 408. Next, the Oetchidi information data field 410, the Oetchidi field 412, and the Oetchidi information data field 414 are recorded before the valid data field 416. Finally, the Oetchidi information data field 420, the Oetchidi field 422, and the Oetchidi information data field 424 are recorded. The Oetchidi fields 404, 412, 422 correspond to physical Oetchidi blocks, that is, data blocks read from a mirror region in which pits are not formed.

Since the optical disk configured as described above includes a mirror area in which pits are not formed, tracking of a normal light beam is impossible when using a general optical disk reproducing apparatus. Therefore, data stored on the optical disc cannot be read normally. However, it may be assumed that the mirror area is jumped to read and copy data stored in the original disk.

Therefore, according to an embodiment of the present invention, the logical block address indicating the position of the sector allocated to the OHD region is scrambled. If the logical block address forms one or more scrambled OHD areas consecutively, the logical block address value assigned to the sector in the data block recorded in the optical disc does not increase sequentially. In the optical disk manufactured as described above, logical block addresses of sectors are discontinuously arranged as shown in FIG. Therefore, when a copy-protected optical disc manufactured according to the manufacturing method according to the present invention is reproduced using a general optical disc reproducing apparatus, the pickup of the optical disc apparatus cannot access the Oetchidi area without the address information of the sector. The address arrangement is discontinuous due to the Oetchidi area. Thus, for example, when reading an optical disc in the optical disc reproducing apparatus, since the optical disc reproducing apparatus expects or expects a sequential address to appear for normal driving, the driving apparatus when the driving apparatus passes or tracks discontinuous addresses. Or a "back track jump" will occur with a discontinuous offset to find the address the system expects. However, it will continue to meet the OHD area, that is, the discontinuous address. In other words, the OSH area cannot be read, and as a result, the corresponding original disk cannot be read qualitatively and cannot be copied. Contains an address different from the original address. In addition, on the duplicated disk after tracking of one OHD area is completed, an address is formed as long as the OHD area has been recorded as a normal address. It is used for recording valid data.

In addition, the mirror area included in the Oetchi area formed in the copy-protected optical disc according to the embodiment of the present invention makes it impossible to find the centerline position information of the track during reproduction by a general optical disc reproducing apparatus. That is, since the optical disc reproducing apparatus cannot maintain normal tracking by the servo, data reading is impossible. In addition, since the EMP signal is not normally detected in the Oetchi region, the EFM signal is not provided to the spindle servo. Therefore, the spindle servo motor is not normally controlled. Therefore, tracking and data reading in the reproduction device are interrupted, so that normal reading of data is not achieved.

It will now be described that the copy protected optical disc according to the present invention cannot be copied using the recordable optical disc apparatus. For example, even if duplication of one OHD area is completed by a recordable optical disk device, the address of another OHD area following the discontinuous address occupying a considerable period is presented, and the other After the OHD region is copied, another OHD region is presented at the end of the OHD region beyond the discontinuous address of a considerable period. If such a process is repeated several times, not only the original can be read by the optical disc device, but also the copied optical disc cannot have the same OHD structure and address structure as the original optical disc even when the optical disc is read and attempted to copy.

6 is a flowchart illustrating a process of reading a non-replicable disc and determining a duplicate disc according to the present invention. Referring to Fig. 6, first, when a copy-protected optical disc is inserted into an optical disc reproducing apparatus, the drive program stored in the optical disc is read and automatically executed (step 602). Such a drive program can be loaded and executed by a control means such as a microcomputer in the optical disc reproducing apparatus or by an operating system executed in a user computer to which the optical disc reproducing apparatus is attached. The drive program includes a routine for determining whether an Oetchi region is detected. When the drive of the disc starts, it is possible to determine whether an Oetchi region has been detected from the optical disc by injecting a light beam into the optical disc while the optical disc is being driven (step 604). Alternatively, step 604 may be a step of determining whether the sector structure consists of a predefined structure by referring to the sector structure of the oetch region. If the Oetchidi region is detected in step 604, the Oetchidi data block is extracted (step 606). If the OHDI data block has been extracted, the ID is extracted (step 608). It is possible to recognize a pattern of an error occurring due to the mirror area as an ID. Next, it is identified whether the extracted ID and the ID obtained from the driving program match (step 610). If the extracted ID and the ID obtained from the driving program are identified to match, the disk is normally driven (step 612). That is, since the optical disk which is copied according to the method of manufacturing a copy-protected optical disk according to the present invention is normally stopped in the optical disk reproducing apparatus, the identification of the copy is made at an early stage. Temporal damage can be prevented in advance.

On the other hand, it is possible to insert a routine for processing the optical disk to be normally operated by receiving a disposable use key, for example, from a remote server via the Internet, in a drive program distributed in the Oetchi area. In this case, the user computer connects to the remote server (step 614) and requests an authenticated use key. If it is determined (step 614) that the use key has been provided and it is determined that an authenticated use key has been provided, then normal drive of the disk can be made. However, the drive program does not detect an Oetchidi area in step 606, or an Oetchidi area in step 606, but does not detect an Oetchidi data block in step 606, and authenticates in step 616. If the used key is not provided, the process is impossible to drive (618). Adding a routine to receive a one-time use key from the server prevents the user from using the optical disc because the ID is not generated normally on the computer even though the client has the original disc. That is, if the user generates an access code without the user's recognition by executing the driving program and provides the generated access code to the authenticated user through the Internet, the user must put the same ID as the generated ID in the computer. Can be used. Thus, one optical disc can be used completely normally for one client.

The optical disk manufactured by the method of manufacturing a copy-protected optical disk according to the present invention is a mirror included in the Oetchidi area in a drive program distributedly stored in the Oetchidi area in the optical disc when reproduced in a general optical disc reproducing apparatus. By referring to whether a region has been detected, you can turn off the replica and distinguish it from the original.

In addition, when driving the original disk according to the present invention, a password, an ID, an access address, and the like, which are required for the execution of the drive program of the optical disk drive apparatus, are extracted by referring to the information stored in the Oetchidi information data block. According to various judgments based on the information, the original optical disk can be driven normally or can not be driven. Therefore, the sectors in the optical disk manufactured according to the copy-protected optical disk manufacturing method according to the present invention can reproduce the content data normally even though the logical block addresses are discontinuously arranged. Thus, the copy-protected optical disc can be normally driven without attaching additional hardware to a device such as an optical disc drive device.

In addition, it is possible to program to generate a different access code each time a running program is executed. That is, some of the internal information that can be read from the individual user computer can be extracted, and the combined data can be used as an access code by combining the extracted information and the error data read from the specific OHD area. In such a case, the information of the OHD area must exist at a position that exactly matches the OHD area in the original optical disc, thereby generating a normal access code so that the driving program continues to run normally, thereby achieving stronger copy protection.

Alternatively, it is also possible to insert some essential data of contents to be executed on the optical disk into the OHD area formed in the optical disk according to the present invention. In this way, when a part of the content is inserted into the OSD area, it is possible to effectively prevent the hacked program from being driven by an algorithm that does not refer to the OSD area.

In addition, since the data stored in the OHD area can be distributed and stored in a predetermined amount in a certain section of the entire content file, the composition of each copy protection data can vary according to the contents of the optical disk, and accordingly the result of encryption It can be generated differently. Therefore, according to the present invention, an individual copy protection service can be provided to a content copyright holder recorded on an optical disc.

It is impossible to copy an optical disk manufactured according to the copy-protected optical disk manufacturing method according to the present invention as described above, and the disk copied by any unknown method is not normally driven by the optical disk reproducing apparatus. Further, in the method of manufacturing a copy-protected optical disc according to the present invention, since a copy-protected optical disc is made by inserting OHD data into a specific area within the optical disc, all processing for copy protection is performed in the manufacturing process of the optical disc. In addition, no further change of the existing optical disc reproducing apparatus is required. In addition, the reliability of copy protection is further enhanced by combining the hardware copy protection structure of the optical disc itself with software encryption and authentication technology.

As described above, an optical disc manufactured according to the copy-protected optical disc manufacturing method according to the present invention cannot be copied by a recordable optical disc apparatus, and a disc copied by any unknown method is produced by an optical disc reproducing apparatus. Normal drive does not work. Further, in the method of manufacturing a copy-protected optical disc according to the present invention, since a copy-protected optical disc is made by inserting OHD data into a specific area within the optical disc, all processing for copy protection is performed in the manufacturing process of the optical disc. In addition, no further change of the existing optical disc reproducing apparatus is required. In addition, the reliability of copy protection is high by combining the hardware copy protection structure of the optical disc itself with software encryption and authentication technology.

Claims (14)

and (a) inserting at least one predetermined optical head ditching (OHD) region between the regions corresponding to the contents, which is impossible to track the optical beam during reproduction in the optical disc reproducing apparatus. A copy-protected optical disc manufacturing method. The method of claim 1, wherein the predetermined Oetchi region, A method of manufacturing a copy protected optical disc, characterized in that it comprises successive pits whose difference in reflectance of reflected light from the pits is below a predetermined threshold. The method of claim 1, wherein the predetermined Oetchi region, A method of manufacturing a copy protected optical disc, characterized in that it comprises a mirror area in which pits are not formed. The method of claim 1, wherein the predetermined Oetchi region, And an Oetchi information data area in which the start address of the sector corresponding to the Oetchi area to be read next is recorded. The method of claim 1, wherein the predetermined Oetchi region, And an Oetchi information data area in which position information of a sector storing valid data to be read next is recorded. According to claim 1, wherein the step (a), (a-1) During the premastering process, the Oetchidi information layer including position information of a sector corresponding to the next Oetchi region to be read and the position information of a sector storing valid data to be read next, distributed in the Oetchidi information layer Performing formatting that inserts a drive program that is stored and stored, and a production identifier that identifies the content; (a-2) during the mastering process, using a formatted signal to create a stamper comprising one or more predetermined Oetchi regions in which the optical beam cannot be tracked during playback in the optical disc player; And (a-3) pressing with a stamper; a copy protected optical disc manufacturing method comprising a. The method of claim 6, wherein step (a-1) comprises: (a-1-1) scrambling a logical block address indicating a position of a sector allocated to the OHD region. And at least one or more predetermined optical head ditching (OHD) areas in which the optical beams cannot be tracked during playback in the optical disk reproducing apparatus between the areas corresponding to the contents. 9. A copy protected optical disc as claimed in claim 8, wherein the predetermined Oetchdi region comprises successive pits whose difference in reflectance of reflected light from the pits is less than a predetermined threshold. The method of claim 8, wherein the predetermined Oetchi region, And a mirrored area in which pits are not formed. The method of claim 8, wherein the predetermined Oetchi region, And an Oetchi information data area in which the start address of the sector corresponding to the Oetchi area to be read after the current sector is recorded. The method of claim 8, wherein the predetermined Oetchi region, And an Oetchi information data area in which position information of a sector in which valid data to be read after the current sector is stored is recorded. The method of claim 8, wherein the predetermined Oetchi region, And a drive program for performing control in accordance with the position information of the sector corresponding to the next Oetchi region to be read and the position information of the sector in which valid data to be read next is stored. The method of claim 6, And a logical block address indicating a position of a sector allocated to the Oetchidi area is scrambled.