KR20080017871A - Optical disc copy protection method - Google Patents

Abstract

An optical disc copy protection method is provided to prevent a disc ID from being illegally copied by the operation of copying content data of the optical disc. A disc inherent ID is written in a specific area assigned before a lead in area of the recordable optical disc. The data of the coded contents is written by the disc ID. When the optical disk is a CD-R/RW, the disc ID is written in a test area and a count value indicating the writing of the disc ID is written in a count area. When the optical disk is a DVD-R/RW, the disc ID is written in a PCA area assigned before a lead in area and a synchronous frame indicating the writing of the disc ID is written.

Description

Optical disc copy protection method {Optical disc copy protection method}

1 illustrates an embodiment of a DVD-R / RW to which a general optical disc copy protection method is applied;

2 illustrates a configuration of an optical disk apparatus to which an optical disk copy protection method according to the present invention is applied;

3 illustrates an embodiment of a CD-R / RW to which an optical disc copy protection method according to the present invention is applied;

4 illustrates an embodiment of a DVD-R / RW to which an optical disc copy protection method according to the present invention is applied;

5 shows an embodiment of a DVD + R to which an optical disc copy protection method according to the present invention is applied.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: VDR system 13: digital signal processing unit

14: Micom 15: OSD generation unit

16: memory

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc copy protection method, wherein in a variety of types of optical disc devices such as a DVD-Recorder, a disc unique ID (DUID) used as an encryption key code is used for general copying. An optical disc copy protection method for preventing unauthorized copying by an operation.

Generally, digital content of video data and audio data is recorded on an optical disc such as a CD or a DVD, so that content requiring copyright protection or the like is illegal by a third party. In order to avoid copying, various copy protection techniques are used.

For example, a copy protection technology of CPRM (Content Protection for Removable Media) is used for DVD-R / RW / RAM, and a copy protection technology of Video Content Protection System (VCPS) is used for DVD + R / RW. .

Meanwhile, the CPRM technology is a hardware-based technology designed to put copy protection constraints on a storage medium structure to prevent unauthorized file copying, and is based on broadcast encryption technology developed in 1993. It is a technology that prevents unauthorized copying of stored data by creating digital tags on storage media such as DVDs and flash memory cards.

The VCPS technology is a copy protection technology in which a disc key block for mutual authentication between a player and a disc is recorded and used in an initial zone or a track of a disc. In the CPRM technology and the VCPS technology, a disc specific technology is used. The ID (DUID) is recorded and used as part of the encryption key code.

However, since the disc unique ID is recorded in an embossed or pre-recorded data zone in the lead-in area of the optical disc, for example, as shown in FIG. In order to prevent the unique ID of the disc from being copied by the normal general copying operation, there is a problem in that an optical disc specially manufactured for copy protection is used.

Accordingly, the present invention has been made to solve the above problems, and for example, in various types of optical disc devices such as a DVD-Recorder, while satisfying a standard standard defined according to the type of optical disc, It is an object of the present invention to provide an optical disc copy protection method for preventing unauthorized copying of a disc unique ID by a general copy operation of copying content data.

In the optical disc copy protection method according to the present invention for achieving the above object, the disc unique ID is recorded in a specific area allocated before the lead-in area of the recordable optical disc, and the content encrypted by the disc unique ID. Characterized in that to record the data,

If the optical disc is a CD-R / RW, a disc unique ID is recorded in a test area of the PCA area allocated before the lead-in area, and a disc unique ID in the count area. And recording a count value representing the recording of

If the optical disc is a DVD-R / RW, the disc unique ID is recorded in a PCA area allocated before the lead-in area, and a sync frame indicating recording of the disc unique ID is recorded.

If the optical disc is DVD + R, the disc unique ID is recorded in the inner disc test zone allocated before the lead-in area, and the disc is unique in the inner disc count zone. And counting values representing the recording of IDs.

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

First, the optical disc copy protection method according to the present invention can be applied to various types of optical disc devices such as a DVD player or a DVD recorder. For example, in the DVD recorder, as shown in FIG. ), An optical pickup 11, a VDR (Video Data Record) system 12, a digital signal processor 13, a microcomputer 14, an OSD generator 15, a memory 16, and the like.

When the optical disc 10 is inserted into the device, the microcomputer 14 operates the VDR system 12 to determine the type of the optical disc 10, and then the data corresponding to the type of the optical disc. The recording operation is performed. In the data recording operation, encrypted data is recorded using all or a portion of the disk unique ID (DUID) as an encryption key code.

On the other hand, in the present invention, the disc unique ID utilized as the encryption key code as described above is recorded in a specific area allocated before the lead-in area of the optical disc, so that it is not copied by an ordinary copy operation.

For example, as shown in FIG. 3, when the type of the optical disc is CD-R / RW, the test area may be included in a test area of a PCA area allocated before the lead-in area. The disk unique ID (DUID) is recorded, and a count value (eg, '1') indicating that the disk unique ID is recorded is recorded in the count area.

On the other hand, as shown in FIG. 4, when the type of the optical disc is DVD-R / RW, since the count area is not separately present in the PCA area allocated before the lead-in area, In addition to recording a disk unique ID (DUID) in the PCA area, four sync frames indicating that the disk unique ID is recorded are recorded.

In addition, as shown in FIG. 5, when the type of the optical disc is DVD + R, a disc unique ID (DUID) is recorded in the inner disc test zone allocated before the lead-in area, and the inner In the Inner Disc Count Area, a count value (eg, '1') indicating that a disc unique ID is recorded is recorded.

Then, the encrypted data is decrypted by utilizing the disc unique ID recorded in the PCA area or the inner disc test zone allocated before the lead-in area as described above, so that the normal audio is processed. And playback the video.

In addition, unlike the lead-in area, the disc unique ID recorded in the PCA area or the inner disc test zone is not copied by a normal copying operation. While satisfying the defined standard specification, it is possible to prevent the disk unique ID from being copied by the normal copy operation.

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.

In the optical disc copy protection method according to the present invention made as described above, in various types of optical disc devices such as a DVD-Recorder, a PCA area allocated before a lead-in area of a recordable optical disc Alternatively, the disc unique ID (DUID) is recorded in a specific area such as an inner disc test zone, and the data of the content encrypted by the disc unique ID is recorded, thereby providing the type of optical disc. It is possible to efficiently prevent the copying of an optical disc without satisfying the standard standard defined according to the above, but preventing the unique ID of the disc from being copied by the normal copying operation, and separately using an optical disc specially designed for copy protection. It is a useful invention.

Claims (4)

In addition to recording the disc unique ID in a specific area allocated before the lead-in area of the recordable optical disc, And recording data of contents encrypted by the disc unique ID. The method of claim 1, If the optical disc is a CD-R / RW, a disc unique ID is recorded in a test area of the PCA area allocated before the lead-in area, and a disc unique ID is recorded in a count area. And recording a count value indicative of the error. The method of claim 1, If the optical disc is a DVD-R / RW, an optical disc copy protection characterized by recording a disc unique ID in a PCA area allocated before the lead-in area and recording a sync frame indicating recording of the disc unique ID. Way. The method of claim 1, If the optical disc is DVD + R, the disc unique ID is recorded in the inner disc test zone allocated before the lead-in area, and the disc unique ID is recorded in the inner disc count zone. An optical disc copy protection method characterized by recording a count value indicating recording.

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