KR100484443B1 - High density optical disc, and method for managing a copy protection information of high density optical disc - Google Patents

Abstract

A recording medium, such as a high-density and/or read-only recording medium, such as BD-ROM, which includes an identification information, which can identify whether optional information, such as copy protection information, is needed or not for the playback of contents stored on the recording medium, and to methods and apparatuses for forming, recording, and reproducing data on the recording medium.

Description

High density optical disc, and method for managing a copy protection information of high density optical disc}

The present invention provides a copy of a high density optical disc for preventing unauthorized copying of main data such as an A / V stream recorded in a data area of a high density optical disc such as a reproduction-only Blu-ray Disc-ROM (BD-ROM). The prevention information management method.

In recent years, the standardization of new high-density optical discs, such as Blu-ray Disc-Rewritable (BD-RE), which can record and store high-quality video data and high-quality audio data for a long time, has made rapid progress. As a result, related products are expected to be developed, released and commercialized.

Meanwhile, as shown in FIG. 1, the BD-RE has a clamping area, a transition area, a burst cutting area (BCA) area, and a lead-in area on the inner circumferential surface of the disc. The disk structure includes a data area and a lead-out area at the center and the outer periphery of the disk, respectively.

The lead-in area may include a first guard (Guard 1) area and a permanent information & control data (PIC) area, a second guard (guard 2) area, an information 2 (Info 2) area, and an OPC (Optimum) area. Power control) area and the like, the first guard area and the PIC area are a pre-recorded area in which data is pre-recorded, whereas the remaining lead-in area and the data The area and the lead-out area are areas where new data is rewritten.

In the PIC area, a high frequency modulated (HFM) groove is formed and recorded as the area where the main general information of the disk to be permanently stored is recorded. The HFM groove is shown in FIG. As described above, the data is modulated and recorded by a Bi-Phase Modulated method to record and store disk information.

On the other hand, in addition to the development of the BD-RE, a new high-density optical disc, for example, a playback-only Blu-ray disc (BD-ROM), which is currently being discussed among related companies, as shown in FIG. ) Area, clamping area, transition area, and information area and rim area, and main data of A / V stream recorded in data area is unauthorized copying. The data may be encrypted by copy protection information (CPI) to prevent the data, and may be recorded as encrypted data.

The copy protection information (CPI) and the disk information (DI) are recorded in the PIC area separately allocated in the information area, and in the optical disk device, copy protection information recorded in the PIC area when the initial servo operation is performed. After the (CPI) is detected, the copy protection information is used to decrypt the main data encrypted in the data area to process the reproduction signal as unencrypted data.

However, in the case where non-encrypted data is recorded in the data area of the BD-ROM, even though copy protection information is not separately recorded in the PIC area, in the optical disk device, the copy protection information is performed during the initial servo operation. Since a series of detecting operations are performed unconditionally, a problem that an actual data reproducing operation is inefficiently delayed due to the detection operation of unnecessary copy protection information occurs, but there is no effective solution yet. In addition, when the copy protection identification information (CPI_rec_Flag) does not exist, not only causes an inefficient delay due to the detection operation of the information, but also the copy protection information (CPI) is properly omitted, or not in a legitimate manner. For example, there is a problem in that it is not possible to distinguish whether the copy protection information CPI is deleted due to illegal copying.

Accordingly, the present invention was created in view of the above situation, and records copy protection information (CPI) selectively recorded in a PIC area of a high-density optical disc such as a reproduction-only Blu-ray disc (BD-ROM). Management of copy protection information of a high density optical disc to record identification information for indicating whether or not to record data in any specific recording section so that a substantial data reproduction operation can be performed more quickly on a high density optical disc on which copy protection information is not recorded. The purpose is to provide a method.

In the method for managing copy protection information of a high density optical disc according to the present invention for achieving the above object, the copy protection information is selectively recorded in the PIC region of the high density optical disc, and the identification information indicating whether the copy protection information is recorded. It is characterized in that recording in any particular recording interval,

Further, according to the present invention, the copy protection information management method of the high density optical disc detects whether the copy protection information is recorded by referring to the identification information recorded in a specific recording section of the high density optical disc, and according to the determination result, Selectively detecting the copy protection information,

In addition, the copy protection information management method of the high density optical disc according to the present invention selectively records copy protection information in the control area of the high density optical disc, and also includes identification information indicating whether the copy protection information is recorded in the copy protection information. Characterized in that the recording,

In addition, the copy protection information management method of the high density optical disc according to the present invention detects identification information indicating whether the copy protection information recorded in the control area of the high density optical disc is recorded, and determines whether the copy protection information is recorded. And selectively detecting the copy protection information according to the determination result.

Further, the high density optical disc according to the present invention is characterized in that copy protection information is recorded in the IC area of the high density optical disc, and identification information indicating the recording of the copy protection information is recorded in any specific recording section. ,

Further, the high density optical disc according to the present invention is characterized in that copy protection information is not recorded in the IC region of the high density optical disc, and identification information indicating unrecorded of the copy protection information is recorded in any specific recording section. ,

The high density optical disc according to the present invention is characterized in that copy protection information is recorded in the control area of the high density optical disc, and identification information indicating the recording of the copy protection information is included in the copy protection information.

Hereinafter, a preferred embodiment of a method of managing copy protection information of a high density optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

First, a high-density optical disc according to the present invention, for example, a reproduction-only Blu-ray disc (BD-ROM), as described above with reference to FIG. 3, has an inner region, a clamping region, a transition region, and an information region and a rim region. In the PIC area having a disk structure and separately allocated in the information area, as shown in FIG. 4, the disk information DI, which is the main information of the disk, is included and recorded, and the data is encrypted in the data zone. Copy protection information (CPI) for decrypting the main data of the prepared A / V stream into unencrypted data is recorded.

On the other hand, when main data of an unencrypted A / V stream is recorded in the data area, copy protection information (CPI) is not separately recorded in the PIC area, but is selectively recorded in the PIC area as described above. Additional information is recorded in the disc information DI recorded in the PIC area, with identification information for indicating whether or not unprotected copy protection information is recorded, for example, a flag bit CPI_rec_Flag having a recording size of 1 byte. Done,

The flag bit as described above is one byte in the disk information recorded before the recording position of the copy protection information, for example, the first disk information (1st_DI), among a plurality of disk information included in the PIC area. The recording size can be recorded.

Further, as shown in Fig. 5, the flag bit may be recorded in a BCA area allocated before the PIC area in which the copy protection information is recorded. For example, the flag bit additionally recorded in the disc information. 6 can additionally be recorded in a recording size of one byte or more in any recording section of a plurality of reserved areas included in the disk information.

Meanwhile, the disc information and the copy protection information recorded in the PIC area may be recorded in the form of a wobble pit or in the form of a serial pit, or may be recorded in various pit forms in which a wobble pit and a serial pit are mixed. The copy protection information recorded in the PIC area is an encryption key value used to encrypt main data recorded in the data area, and is alternatively recorded in a specific recording section other than the PIC area. It may be recorded or repeated. Regarding the recording method of the information in the PIC area, only a duly authorized manufacturer can recognize or use it, and a duly unauthorized manufacturer redigitizes the analog output to re-master the disc. It is possible to increase the performance of the copy protection system by disabling manufacturing operations such as

As shown in FIG. 7, in the optical disc apparatus including the optical pickup 11, the VDP (Video Disc Play) system 12, the D / A converter 13, and the like, the BD-ROM 10 Detect or refer to a flag bit (CPI_rec_Flag) indicating whether or not copy protection information is recorded among the recorded disc information (DI) included in the PIC area of the PIC area, or the recorded flag bit included in the BCA area of the BD-ROM 10. By detecting and referring to it, it is determined whether copy protection information has been recorded.

On the other hand, when it is determined that the copy protection information is recorded by the flag bit, the VDP system of the optical disk apparatus performs the operation of detecting the copy protection information recorded in the PIC area and then copies the copy protection information. By this, a series of data reproducing operations for decrypting and reproducing encrypted data recorded in the data area are performed.

On the other hand, when it is determined that the copy protection information is not recorded by the flag bits, the operation of unnecessarily detecting copy protection information not recorded in the PIC area is omitted in the VDP system of the optical disk device. A series of data reproducing operations for reading out and reproducing unencrypted data recorded in the data area can be performed more quickly.

Meanwhile, the flag bits recorded in the PIC area or the BCA area may be recorded in a specific recording format that is not arbitrarily copied in a general copying operation, for example, in a wobble form. In this case, a normal optical disc authoring process may be performed. Since the wobble-type flag bits are not recorded on the optical disk copied without permission, it can be usefully used to determine the authenticity of the optical disk.

In addition, the playback-only Blu-ray Disc (BD-ROM) according to another embodiment of the present invention has an inner region, a clamping region, a transition region, and a disc structure of an information region and a rim region, as shown in FIG. Copy protection information (CPI) for decrypting the main data of the A / V stream encrypted and recorded in the data zone into unencrypted data, in the PIC area separately allocated in the information area. Is recorded to include.

On the other hand, when main data of an unencrypted A / V stream is recorded in the data area, copy protection information (CPI) is not separately recorded in the PIC area, but is selectively recorded in the PIC area as described above, or Identification information for indicating whether or not unrecorded copy protection information is recorded, for example, a flag bit (CPI_rec_Flag) having a recording size of 1 byte is included in the copy protection information (CPI) recorded in the PIC area. do.

For example, when the flag bit written in the recording size of one byte in the head recording section of the copy protection information is '0000 0000', it indicates unrecorded copy protection information, and in the case of '0000 1111', Indicates that copy protection information is recorded.

On the other hand, the copy protection information (CPI) including the above-described flag bits is recorded in the PIC area along with the DI information, or as a specific recording area other than the PIC area, as shown in FIG. For example, it can be recorded in a variety of control areas, such as a BCA area. According to the detection and the form of the flag bit, it is possible to distinguish whether the copy protection information (CPI) is omitted in a legitimate manner or deleted due to, for example, illegal copying. In the case where the identification information CPI_rec_Flag is placed in the copy protection information CPI itself, including the head of the information CPI, the recording method of the identification information is in the form of a wobble pit or a serial pit as described. Or a variety of forms in which the wobble pit form and the serial pit form are mixed, or the like, or may be recorded in the same manner as the recording method of the copy protection information CPI. In addition, the copy protection information (CPI) and identification information (CPI_rec_Flag) of the recording method is kept secret so as not to be disclosed to the outside, thereby preventing the possibility of illegal duplication of any manufacturer not formally authorized copy protection system (Contents It can increase the reliability of Protection System.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

A copy protection information management method for a high density optical disc as described above is used to indicate whether copy protection information (CPI) is recorded in a PIC area of a high density optical disc such as a reproduction-only Blu-ray disc (BD-ROM). By recording the identification information in any specific recording section before the recording position at which the copy protection information is recorded, the optical disk apparatus has a high density in which copy protection information is not recorded by referring to the identification information when performing the data reproducing operation. The unnecessary copy protection information detection process for the optical disc can be omitted in advance, so that the data reproducing operation can be performed more quickly, and when the CPI identification information does not exist, an inefficient delay due to the detection operation of the information is achieved. Whether CPI information is duly omitted, or not in a legitimate way, eg illegal It is a very useful invention to easily distinguish whether the CPI information is deleted due to duplication through the identification information.

1 shows a disc structure for a rewritable Blu-ray Disc (BD-RE),

2 shows a high frequency modulation (HFM) groove recorded in a PIC region of a rewritable Blu-ray disc,

3 shows a disc structure for a playback-only Blu-ray disc (BD-ROM),

4 and 5 show an embodiment in which identification information indicating whether or not copy protection information is recorded by the copy protection information management method of the high density optical disc according to the present invention is recorded;

6 shows disc information in which identification information is additionally recorded by the copy protection information management method of the high density optical disc according to the present invention;

7 schematically shows a configuration of an optical disk apparatus to which the present invention is applied,

8 to 9 show other embodiments in which identification information indicating whether or not copy protection information is recorded by the copy protection information management method of the high density optical disc according to the present invention is recorded.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: VDP system 13: D / A converter

Claims (34)

In addition to selectively recording copy protection information in the PC area of the high density optical disc, And the identification information indicating whether or not the copy protection information is recorded is recorded in an arbitrary specific recording section. The method of claim 1, And the identification information is recorded as flag bits at a recording position before the recording position of the copy protection information. The method of claim 1, And the identification information is recorded as flag bits in the disk information recorded in the PC area. The method of claim 1, And said identification information is recorded as flag bits in a BC area allocated before said PIC area. The method of claim 1, And the identification information is recorded in a wobble format recording format which is not arbitrarily copied by a general data copying operation. By detecting and referring to the identification information recorded in the specific recording section of the high density optical disc, it is possible to determine whether to record the copy protection information. And the copy protection information is selectively detected according to the determination result. The method of claim 6, And if it is determined that the copy protection information is recorded, the copy protection information recorded in the PIC area of the high density optical disc is retrieved and read. The method of claim 6, And if it is determined that the copy protection information is not recorded, the step of searching for and reading out the copy protection information is omitted. Copy protection information is recorded in the PC area of the high density optical disc, The identification information indicating the recording of the copy protection information is recorded in any specific recording section. While copy protection information is not recorded in the PC area of the high density optical disc, A high density optical disc, characterized in that identification information indicating unrecorded of the copy protection information is recorded in an arbitrary specific recording section. The method according to any one of claims 9 and 10, The identification information is recorded as flag bits in the disk information recorded in the PIC area. The method according to any one of claims 9 and 10, And said identification information is recorded as flag bits in a BC area allocated before said PIC area. In addition to selectively recording copy protection information in the control area of the high density optical disc, And the identification information indicating whether the copy protection information is recorded is recorded in the copy protection information. Detecting the identification information indicating whether or not the copy protection information recorded in the control area of the high density optical disc is recorded, discriminating whether or not the copy protection information is recorded, And the copy protection information is selectively detected according to the determination result. Copy protection information is recorded in the control area of the high density optical disc, And the identification information indicating the recording of the copy protection information is recorded in the copy protection information. The method according to any one of claims 9 and 10, The identification information is recorded in the same manner as the recording method of the copy protection information. The method of claim 13, And the identification information is recorded at the head of the copy protection information. The method of claim 13, And the copy protection information includes encryption key information for encrypting main data. The method of claim 13, And said identification information is recorded in the same recording manner as said copy protection information. The method of claim 13, And said identification information is recorded by a recording method different from said copy protection information. The method of claim 13, And the identification information is recorded in a recording method different from that of the main data recording method. The method of claim 13, And said identification information is recorded in a recording manner that is not arbitrarily copied by a general data copying operation. The method of claim 14, And the identification information is recorded at the head of the copy protection information. The method of claim 14, And the copy protection information includes decryption key information for decrypting the main data. The method of claim 14, And said identification information is recorded in the same recording manner as said copy protection information. The method of claim 14, And said identification information is recorded by a recording method different from said copy protection information. The method of claim 14, And said identification information is recorded by a recording method different from that of the main data recording method. The method of claim 14, And the identification information is recorded in a recording method that is not arbitrarily copied by a general data copying operation. The method of claim 15, And said identification information is recorded at the head of said copy protection information. The method of claim 15, And the copy protection information includes decryption key information for decrypting the main data. The method of claim 15, And said identification information is recorded in the same recording manner as said copy protection information. The method of claim 15, And said identification information is recorded by a recording method different from said copy protection information. The method of claim 15, And said identification information is recorded by a recording method different from the recording method of main data. The method of claim 15, And said identification information is recorded by a recording method which is not arbitrarily copied by a general data copying operation.