KR100608268B1 - Method and apparatus for protecting copyright of digital recording media, and the digital recording media - Google Patents

Abstract

A copyright protection method of a digital recording medium includes: (1) recording data to be copyright protected in a first area of the digital recording medium; And (2) after the step (1) is completed, recording information for authentication between the digital recording medium and its playback system in a second area of the digital recording medium. The above-mentioned second area is an area that cannot be recorded and corrected by the user, and the area management information for distinguishing at least one reproducible area and / or non-reproducible area is preferably used for the above information for authentication. The digital recording medium for copyright protection also includes a first area in which data to be copyrighted is recorded, and a second area in which information for authentication between the digital recording medium and its reproduction system is recorded. The reproducing apparatus for such a digital recording medium reads the authentication information from the second area of the digital recording medium and reproduces the data recorded in the first area on the basis of the result of comparison with the unique authentication information set in the reproducing system. Determine whether or not. As a result, the present invention protects the copyright of the contents stored in the digital recording medium by preventing the illegal copying of the digital recording medium even by a professional copying technology, and the supplier of the digital recording medium is flexible to the changing market environment of each region. It provides an effect that can be used to respond.

Description

Method and apparatus for protecting copyright of a digital recording medium, and a digital recording medium therefor {Method and apparatus for protecting copyright of digital recording medium, and copyright protected digital recording medium}

1 is a flowchart for explaining a conventional signal processing method for recording data including copyright management information on a DVD-ROM;

FIG. 2 is a diagram schematically showing a format structure of a sector of a DVD-ROM in which data including copyright management information is recorded by the signal processing method of FIG. 1;

Fig. 3 is copyright management information including area management information in a sector having a format structure shown in Fig. 2, provided in a lead-in area of a DVD-ROM, according to a conventional area management information recording method. Diagram showing a format structure of a copyright management information area (CPR_MAI) for

FIG. 4 is a flowchart for explaining a signal processing method for recording regional management information in a manner in which data subject to copyright protection and duplication are not allowed on a DVD-ROM according to an embodiment of the present invention;

FIG. 5 is a diagram showing a code (BCA-code) configuration of a burst cutting area BCA in which local management information is recorded so as not to be replicated, according to the signal processing method shown in FIG. 4;

Fig. 6 is a block diagram showing a playback apparatus for a digital recording medium to be protected by copyright in accordance with a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

61: optical disc 62: reading means

63: control means 64: memory

65: data restoration means

The present invention relates to copyright protection for a digital recording medium, and in particular, by recording local management information used as information for authentication between the digital recording medium and its playback system on the digital recording medium in a manner that does not allow copying. A method and apparatus for protecting the copyright of the present invention and a digital recording medium thereof.

Copyright protection for all content (video titles, audio titles, or multimedia data) or software stored on digital recording media is essential, both now and in future A / V or computer-related equipment. To this end, hardware with various copyright protection functions (including devices and firmware), software and digital recording media are being developed under various standards or regulations.

Currently developed or proposed copyright protection techniques include cryptosystems and authentication systems and hybrid systems combining them. Cryptographic systems include symmetric cryptographic systems and asymmetric cryptographic systems. Authentication systems include user authentication, digital signature, and message authentication. There is a content scramble system (CSS) employing both an authentication system and a cryptographic system.

In particular, among copyright protection techniques for contents stored in a digital recording medium, there is an authentication system that uses Regional Management Information (RMA) as authentication information. The authentication system using region management information records a region code for distinguishing at least one playable region or a region that cannot be played on a digital recording medium, and records the region code of the digital recording medium loaded in the playback system and the region code. Playback of the loaded digital recording medium is allowed only if the set area codes match each other. As a result, the authentication system using the regional management information protects the copyright of the content or the software stored in the digital recording medium from the user of the non-reproducible region who does not have the right. For example, in a specific sector of a lead-in area of a digital versatile disc (DVD), a region code for reproducing whether to play or not for each region of the world divided into eight regions is recorded. do.

Referring to FIG. 1, a conventional signal processing method for recording data including both copyright management information including regional management information and data subject to copyright protection on a DVD-ROM will be described.

When data is to be recorded on a DVD-ROM (Read-only-DVD), A / V data or software of programs is signaled in units of 2048 bytes of main data divided therein. In step 101, each main data is appended with 4 bytes of identification data ID and 2 bytes of ID error detection code IDE for this identification data ID, and 6 bytes of copyright management information (CPR_MAI; CoPyRight_ManAgement). Information) is further added (step 102). Then, an error detection code (EDC) for all of the ID, IDE, CPR_MAI and main data is additionally added (step 103). After the EDC is added, scramble of only the main data is selectively performed according to whether the scramble method is adopted (step 104). In this case, when the steps 101 to 104 are performed, one logical data sector is generated.

Error correction (ECC) encoding for data sectors is performed on 16 data sectors (step 105), and parity outer (PO) rows of 16 are interleaved within the data sectors by ECC encoding. (Step 106). As a result, 16 recording sectors are generated (step 107). Each of the recording sectors is divided into 26 sync frames, and data in each sync frame is EFM plus (+) modulated using an EFM plus (EFM +) table (step 108). EFM plus modulation is adapted to record data on a read-only DVD (DVD-ROM) from an EFM (eight to fourteen modulation) modulation used to record data on a CD. EFM plus modulation is actually an 8 to 16 modulation that converts an 8-bit symbol into a 16-bit code word represented as a binary code. By step 108, 16 physical sectors are created, the format structure of each of which is generated as schematically shown in FIG.

On the other hand, the six-byte copyright management information CPR_MAI added in step 102 described above includes region management information including a region code for distinguishing at least one playable region or a non-playable region of a digital recording medium. Therefore, when the physical sector created in step 108 is provided in the lead-in area of the DVD-ROM, the above-described area management information is stored in the copyright management information (CPR_MAI) area in the sector. Are recorded as shown. Referring to FIG. 3 according to the conventional area management information recording method, the copyright management information (CPR_MAI) area in a specific sector in the lead-in area is composed of 6 bytes (48 bits) as shown in FIG. The uppermost 1 byte of the copyright management information area is used as an area (CPS_TY; Copyright Protection System_TYpe) for distinguishing types of copyright protection systems, and 4 consecutive bytes are left as reserved areas. In the lowest 1 byte (8 bits) of the copyright management area, area management information (RMA) having area codes (RMA # 1 to RMA # 8) for reproducing or not for each of eight areas is recorded. Here, each region code is set to have a bit value "0" if reproducible in the corresponding region and a bit value "1" if not reproducible.

On the other hand, DVD-ROM playback systems (including DVD-ROM drives, DVD Decorder Cards, and DVD players) to which authentication systems using regional management information are applied are first identified in the lead-in area of the DVD-ROM when the DVD-ROM is loaded into the set. Reads the above area code values from the copyright management area of the sector and compares them with the unique area codes set in the playback system, and only allows the data recorded in the user data area of the DVD-ROM to be reproduced. If not, playback stops and the corresponding warning text is displayed to the user.

However, conventionally, by recording the area management information for allowing reproduction only in a specific area in an area that can be recorded and corrected by a user, such as a lead-in area in a digital recording medium, Piracy can be prevented, but there is a problem that can not prevent piracy of professional cloning technicians. For example, professional duplication technicians read the local management information and the contents data of the user data area in the lead-in area of a genuine optical disc and record the same format and contents in the lead-in area and user data area of another optical disc. Enables playback of cloned optical discs in your area.

Also, in the production of a digital recording medium, when recording local management information on a digital recording medium to allow reproduction only in a specific area, it is necessary to author content data and area management information that are subject to copyright protection together. ) And channel modulation (e.g., EFM plus modulation on DVD-ROMs) and then mastered (mastring) to produce the required amount for each region. Therefore, conventionally, even if a digital recording medium for the same contents data is produced, the production volume for the sales region must be predicted and determined in advance, and the regional management information is different for each region, so the manufacturing and mastering steps are different, which makes the manufacturing process complicated. However, since it is very difficult to change the regional management information of the produced digital recording media, there is a problem in that it cannot flexibly respond to the changing market environment of each region.

An object of the present invention to solve the above problems is to provide information for authentication between the digital recording medium and its playback system so that illegal copying is impossible even for professional copying technicians and the supplier can flexibly respond to the market environment of each region. The present invention provides a method of protecting the copyright of a digital recording medium by using.

Another object of the present invention for solving the above problems is to provide a digital recording medium according to the copyright protection method described above.

Another object of the present invention for solving the above problems is to provide a reproducing apparatus for the above-described digital recording medium.

In order to achieve the above object of the present invention, a method for protecting copyright on a digital recording medium comprises: (1) recording data to be copyright protected in a first area of the digital recording medium; And (2) after the step (1) is completed, recording information for authentication between the digital recording medium and its playback system in the second area of the digital recording medium.

In particular, the above-mentioned second area is an area that cannot be modified and recorded by the user, and the information for the above authentication includes area management information for distinguishing at least one playable area and / or non-reproducible area of the digital recording medium. It is preferable to use.

A digital recording medium for achieving another object of the present invention described above includes a first area in which data to be protected by copyright is recorded, and a second area in which information for authentication between the digital recording medium and its reproduction system is recorded. do.

In order to achieve the above object of the present invention, a playback apparatus for a digital recording medium includes a first area in which data to be protected by copyright is recorded, and a first authentication for authentication between the digital recording medium and its reproduction system. A digital recording medium having a second area in which information is recorded, wherein the second area is an area that cannot be recorded and modified by a user; A memory for storing system-specific second authentication information; Reading means for reading first authentication information and data recorded in the second area and the first area of the digital recording medium; And based on a result of comparing the first authentication information read from the second area of the digital recording medium by the reading means with the second authentication information stored in the memory, whether data recorded in the first area of the digital recording medium is reproduced or not is determined. It includes a control means for.

Hereinafter, with reference to the accompanying Figures 4 to 6 will be described in detail preferred embodiments according to the present invention.

The present invention first authors and masters content data subject to copyright protection, records it in a first area of a digital recording medium, and then provides information for authenticating the digital recording medium and its reproduction system with each other. And record in a second area on the digital recording medium which is an area that cannot be recorded or modified. Therefore, the playback apparatus can reproduce the contents data recorded in the first area of the digital recording medium only when the authentication information recorded in the second area of the digital recording medium matches the unique authentication information set in the playback device. Will be. In the preferred embodiment of the present invention, as the authentication information described above, it is preferable to use area management information for distinguishing at least one playable area and / or non-playable area of the digital recording medium, but the present invention is not limited thereto. Do not.

In addition, the above-mentioned first area is composed of a lead-in area, a user data area, and a lead-out area, and data can be recorded and / or modified by a user. It is characterized by a possible area. The second area is located outside the first area described above. In particular, when the digital recording medium is an optical disc, the second area is formed between a center hole and a lead-in area of the optical disc. It is characterized in that the area is a position where the optical head can read data recorded in the second area.

4 is a signal processing method for recording content data subject to copyright protection on a DVD-ROM and regional management information as the authentication information described above for copyright protection of a digital recording medium; Shows.

In the flowchart of FIG. 4, steps 101 and 103-108 are the same or similar in operation to those described with respect to FIG. 1, and thus description thereof is omitted. However, since step 102 of FIG. 1 is removed from the flowchart of FIG. 4, the data signaled in steps 103 to 108 of FIG. 4 includes copyright management information (CoPyRight_MAnagement Infomation) including Regional MAnagement information (RMA); The difference is that CPR_MAI) is not added.

In FIG. 4, when step 108 is finished, the authoring and channel modulation of the contents data to be protected by copyright and the recording of the first area of the DVD-ROM are ended. The stored DVD-ROMs can be mass-produced without having to consider whether they can be played in a specific region.

Thereafter, in step 400, the regional management information for each region corresponding to the production plan of the DVD-ROM for each region is recorded in the burst cutting area (BCA) of the DVD-ROM produced by the aforementioned mastering; Corresponding to the second area of the medium). More specifically, first, the regional management information to be recorded in the burst cutting area uses a channel modulation method (for example, an RZ modulation method) different from the channel modulation method (EFM plus modulation method) of the contents data recorded in the first area. Channel is modulated. Thereafter, the channel-modulated area management information is recorded in a data field in the burst cutting area using a YAG laser, which is a workability laser.

On the other hand, the burst cutting area (BCA) in the DVD-ROM can reproduce data recorded in the BCA using optical pickup of a general recording and / or reproducing system, but cannot be recorded and modified. Even without the use of expensive YAG lasers, even a professional copying technology is an area that can not be copied at all, and is an area for selectively recording additional information after the disc manufacturing process is finished. The burst cutting area BCA in the DVD-ROM is located between the center hole of the DVD-ROM and the lead-in area, and is located where the optical head of the playback system can read the data recorded in the burst cutting area.

Referring to Fig. 5 showing the configuration of the BCA-code recorded in the burst cutting area BCA in the DVD-ROM, the BCA-code is a row of BCA-preamble fields, 4n (1). ≤ n ≥ 12, n is a BCA-data field consisting of (integer) rows, and one row of BCA-postamble fields, each row having a size of 5 bytes. These three fields are continuously recorded in the burst cutting area BCA of the DVD without a gap. The BCA-preamble field has 1 byte of BCA sync (SB _BCA ) and 4 bytes of BCA-preamble followed by SB _BCA . The BCA data field includes a single byte BCA resynchronizer (RS _BCA ), a plurality of pieces of information data (I ₀ , I ₁ , ..., I _16n-5 ), and an error detection code (EDC) for the information data. _BCA ), and four lines of code (ECC _BCA ). The information data, error detection code and error correction code of each row have a size of 4 bytes.

In the preferred embodiment of the present invention, the four bytes of the first row in the BCA-data field, particularly the BCA-data field, of the burst cutting area BCA described above are used to protect the DVD-ROM and its copyright. It is used to record the regional management information (RMA) as authentication information for authenticating the reproduction system with each other, and the present invention is not limited thereto. If one byte of the above four bytes is recorded in the same form as the regional management information shown in Fig. 3, compatibility with the existing playback system can be maintained, and the remaining three bytes of the regional management information area for the additional information to be expanded. It is preferable to use it as a reserved area. Also, each region code constituting the region management information can be distinguished from the conventional region code shown in FIG. 3 by setting the bit value "1" if it can be reproduced in the corresponding region and the bit value "0" if it cannot be reproduced. It may be.

When playing a DVD-ROM having such area management information in the data field of the burst cutting area (BCA), the DVD player first reads the BCA-code of the BCA area from the DVD-ROM loaded in the system and manages the area. Recognize the information. Then, the DVD player determines whether to play the DVD-ROM based on a result of comparing with the system-specific regional management information, and accordingly plays back the data recorded in the first area of the DVD-ROM, The warning text is displayed to the user without reproducing the data of the first area.

The preferred embodiment of the present invention described so far uses the region management information as the authentication information for copyright protection of the DVD-ROM by authenticating the DVD-ROM and its playback system with each other. Recorded separately from the recording method of the first area in the burst cutting area (BCA) of the ROM, and the area management information of the recorded BCA is first read and recorded in the first area of the DVD-ROM only when the above authentication is completed. Allow the playback of the data. However, the present invention is not limited to the embodiment described above. Therefore, the present invention can be applied to a digital recording medium which records various authentication information for a digital recording medium in a non-replicable area, and a method for such a digital recording medium, and a recording and / or reproducing apparatus thereof.

Fig. 6 shows a playback apparatus for an optical disc in which authentication information for copyright protection is recorded in a non-copyable area, according to a preferred embodiment of the present invention. The playback apparatus of FIG. 4 reproduces the stored contents data only when the optical disk and its playback apparatus are mutually authenticated by using the authentication system when the contents data stored on the optical disk 61 is reproduced. This reproducing apparatus includes an optical disc 61, a reading means 62, a data restoring means 65, a memory 64, and a control means 63.

The optical disc 61 has a first area in which the contents data to be protected by copyright is recorded, and a second area in which the first authentication information is recorded using a processable laser, which cannot be recorded and modified by the user. More specifically, in the burst cutting area BCA of the optical disc 61 serving as the second area described above, at least one playable area and / or as first authentication information for authenticating the optical disc and its playback system with each other Alternatively, the first regional management information (RMA) for distinguishing the non-reproducible region is recorded in a different recording method from the contents data recorded in the first region. The burst cutting area BCA is formed in a portion of the transparent window that lies between the center hole of the optical disc 61 and the lead-in area. Further, as the optical disc 61 for the apparatus of FIG. 6, a digital multifunctional disc having a first DVD-ROM, a DVD-RAM, or a hybrid-DVD having both of them, is provided with a first region in which contents data is recorded. (DVD) can be used.

When the apparatus of FIG. 6 plays back the optical disc containing the contents data, the reading means 62 is recorded in a data field in the burst cutting area BCA of the optical disc 61 loaded on the deck (not shown). The first area management information is first read and supplied to the control means 63, and optionally the contents data recorded in the first area is read to the data restoring means 65 according to the control from the control means 63. Supply. Here, the optical pickup means for reading the burst cutting region and the second region, which are the first region, uses the same optical head. The memory 64 stores preset second area management information as second authentication information unique to the reproduction system, and outputs the stored second authentication information to the control means 63 in accordance with a read request from the control means 63. do.

The control means 63 controls the respective components shown in FIG. 6 as a whole, the first area management information as the first authentication information which is first read and supplied from the burst cutting area by the reading means 62, and the memory 64. On the basis of the result of comparing the second area management information as the second authentication information stored and supplied), it is determined whether to reproduce the content data recorded in the first area in the optical disc 61 loaded on the deck. More specifically, the control means 63 stores the data recorded in the first area of the optical disc 61 only when the reproducible area specified in the first area management information is in the reproducible areas specified in the second area management information. Is controlled to play (read and / or restore), otherwise the playout is displayed to the user without playing. In particular, when the loaded optical disc 61 is authenticated as being reproducible, the control means 63 applies a control signal to the reading means 62 to read the data recorded in the first area, and thus the reading means ( 62 reads data of the first area and supplies them to the data restoring means 65. The data restoring means 65 processes the supplied data to restore the original data, thereby enabling the optical disk 61 to be normally played back.

On the other hand, the optical disc 61 in which the area management information as the authentication information is recorded in the burst cutting area BCA according to the present invention is distinguished from the expensive processability laser (for example, YAG laser) and the first area in the large production line. Even without professional record modulation methods, even a professional copying engineer cannot make the same copy. More specifically, when illegal copying is attempted using a general computer-related device and an optical disc recording and reproducing apparatus, the contents data recorded in the first area may be duplicated, but the local management information recorded in the BCA, the second area. Cannot record on the BCA of the recording target optical disc, and therefore cannot copy an optical disc having the same format and contents illegally. Therefore, reproduction is not permitted even when an optical disc that has not been identically copied is loaded in the reproduction device of FIG. 6, so that the copyright of the optical disc according to the present invention is protected.

In the above-described embodiment of Fig. 6, the description is limited to the optical disc reproducing apparatus. However, it will be apparent to those skilled in the art that the apparatus for the digital recording medium will be embodied within the technical scope of the present invention. do.

As described above, the method and apparatus for copyright protection of a digital recording medium according to the present invention, and the digital recording medium are stored and supplied to the digital recording medium by preventing illegal copying even by a professional copying technician. Or to protect the copyright of the content being sold.

In addition, in the production process including the mastering of the digital recording medium, the present invention does not need to predict and determine the amount of production for each region in advance, and does not need to author and master the same contents data for each region differently. After mass production of digital recording media by the authoring and mastering of the data, only regional management information is recorded according to the market environment that is changing in each region. Therefore, it is possible to reduce the manufacturing cost of digital recording media and to flexibly cope with the market environment. To provide.

Claims (19)

In a method for protecting copyright on a digital recording medium, (1) recording data to be protected by copyright in a first area of the digital recording medium; And (2) After the step (1) is finished, information for authentication between the digital recording medium and its playback system is placed between the center hole and the lead-in area of the digital recording medium. Writing to the second area. The method of claim 1, wherein the information for authentication is And region management information for distinguishing at least one playable region and / or non-playable region of the digital recording medium. The method of claim 1, wherein the second area is an area that cannot be recorded or modified by a user. The method of claim 1, wherein the second area is a burst cutting area (BCA) of an optical disc used as the digital recording medium. delete The method of claim 4, wherein the optical disc is a digital versatile disc (DVD). The method of claim 1, wherein step (2) (2a) modulating the information for authentication using a channel modulation scheme different from a channel modulation scheme of data recorded in the first area; And (2b) recording information for the modulated authentication to a second area using a processable laser. The method of claim 1, (3) reading information for the authentication from a second area in the digital recording medium; And (4) determining whether to reproduce the data recorded in the first area in the digital recording medium, based on a result of comparing the read authentication information with the authentication information preset in the reproduction system for the digital recording medium. How to include more. In a digital recording medium for protecting copyright, A first area in which data to be protected by copyright is recorded, and a second area in which information for authentication between the digital recording medium and the reproduction system is recorded; The second area is a burst cutting area (BCA) of an optical disc that cannot be recorded and modified by a user. The method of claim 9, wherein the information for authentication is And digital authentication medium for determining whether to reproduce the digital recording medium according to a result of comparison with the authentication information set in the reproduction system for the digital recording medium. The method of claim 9, wherein the information for authentication is And digital management information for identifying at least one reproducible region and / or non-reproducible region of the digital recording medium. 12. The digital recording medium of claim 11, wherein the area management information is recorded in a BCA-data field of the burst cutting area (BCA). 13. The digital recording medium of claim 12, wherein the burst cutting area is located between a center hole and a lead-in area of the optical disc. 10. The digital recording medium of claim 9, wherein the optical disc is a digital versatile disc (DVD). 15. The method of claim 14, wherein the digital multifunctional disc (DVD) A digital recording medium which is one of a hybrid-DVD having a DVD-ROM, a DVD-RAM, a RAM area as an area for storing information, and a ROM area. A reproduction apparatus for a digital recording medium, A first area in which data to be protected by copyright is recorded, and a second area in which first authentication information for authentication between the digital recording medium and its playback system is recorded in a different recording method from that in the first area. And a second recording area, the digital recording medium being an area that cannot be recorded or modified by the user. A memory for storing system-specific second authentication information; Reading means for reading the first authentication information and the data recorded in the second area and the first area of the digital recording medium; And Reproduction of data recorded in the first area of the digital recording medium based on a result of comparing the first authentication information read from the second area of the digital recording medium by the reading means with the second authentication information stored in the memory; And a control means for determining whether or not. The method of claim 16, wherein the first authentication information And reproducing region management information for distinguishing at least one reproducible region and / or non-reproducible region of the digital recording medium. The method of claim 16, wherein the first authentication information A reproducing apparatus recorded in a burst cutting area (BCA) of an optical disc used as a digital recording medium. The method of claim 16, wherein the reading means A reproduction apparatus for reading out information recorded in the second area and the first area by using the same optical pickup means.

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