KR100841405B1 - Optical recording medium with copy protection function and method of detecting duplicated optical recording medium - Google Patents

Abstract

Disclosed are an optical recording medium having a copy protection function and a method of detecting a duplicated optical recording medium. The optical recording medium according to the present invention forms a nanometer CD key in a predetermined sector on a recording surface to prevent data from being read during the copying process. In addition, the present invention, when a duplicated medium is used from the optical recording medium on which the nanometer CD key is formed, it is possible to determine that the duplicated recording medium using a predetermined search program for searching the nanometer CD key.

Optical record carrier, copy protection

Description

Optical recording medium comprising a reproduction protecting function and method for detecting a reproduced medium according to the same function}

1 illustrates an optical record carrier according to an embodiment of the present invention;

2 is a diagram illustrating a sector on which a nanometer cd key is formed according to an embodiment of the present invention; and

3 is a flowchart provided to explain a method of detecting a duplicated optical record carrier according to an embodiment of the present invention.

The present invention relates to an optical recording medium having a copy protection function and a copy protection method thereof, and more particularly, to forming a predetermined nanometer CD key on a recording surface so that data cannot be read during the copying process. The present invention relates to an optical recording medium having a copy protection function for preventing copying and a method of detecting a duplicated optical recording medium.

An optical recording medium such as a CD-ROM (Compact Disk Read Only Memory) has a myriad of grooves formed along a track, which is called a pit and lands on a flat surface. The CD driver reads data based on the laser reflected from the pits and lands while irradiating the laser along the track. This data consists of zeros and ones.

Here, the CD-ROM cannot write back data once. Therefore, the driver can only read already recorded data from the CD-ROM.

Such CD-ROMs, DVD-ROMs, and the like can be easily copied by a commonly used copying tool and the like, and the damage caused by unauthorized copying of copyrighted content is increasing day by day.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical recording medium having a copy protection function that prevents data from being read during copying by forming a predetermined nanometer CD key in some sectors of the recording surface. In providing.

Another object of the present invention is to provide a duplicated optical record carrier detecting method for detecting a duplicated optical record carrier based on the nanometer CD key.

In order to achieve the above object, an optical recording medium having a copy protection function according to the present invention is mounted on a predetermined player and a land or a pit when a whole sector is scanned for copying. Based on the shape or arrangement of the pit), a nanometer CD key having a shape that cannot be read as '0' or '1' is formed over a predetermined sector to prevent the copying, and the nanometer CD key is formed. The sector information is recorded in the lead in area.

Here, in the case where the center hole (Hole) and the edge of the optical recording medium is divided into three, the sector in which the nanometer CD key is formed may be provided in the middle or outer region.

In addition, when observing the center hole of the optical record carrier in a vertical direction, at least one of numbers and letters recognizable by a person may be engraved in the sector where the nanometer CD key is formed.

In the method for detecting a duplicated optical record carrier according to another embodiment of the present invention, a shape that cannot be read as '0' or '1' based on the shape or arrangement of lands or pits is spread over a predetermined sector from the optical record carrier player. Detecting at least one of seek time, access time, and position information of the formed nanometer cd key; and if the detected information is not equal to a preset value, the optical recording medium mounted on the player is a replica. And determining that it is.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a view showing an optical recording medium according to an embodiment of the present invention.

The optical recording medium 100 of the present invention corresponds to an optical recording medium that cannot be rewritten, such as a compact disc read only memory (CD-ROM) or a digital versatile disc (DVD) ROM. Data recorded on the optical recording medium 100 may be read by an 'optical recording medium player' such as a digital versatile disk (DVD) player and a CD player.

In the optical recording medium 100 of the present invention, a predetermined nanometer CD key is formed in some sectors of the recording surface, so that data cannot be read during copying by a CD-ROM writer or the like. To prevent duplication. However, the optical recording medium 100 of the present invention is implemented so that data is normally read during normal operation performed by the optical recording medium player or the like instead of the copying process. For convenience of explanation, hereinafter, the optical recording medium 100 is operated by the optical recording medium player to perform its original function in response to the 'copying operation' or the 'copying process'. Also, the optical record carrier player is simply referred to as a 'player'. Such a player may record certain data on another type of optical recording medium which can be rewritten instead of the optical recording medium of the present invention.

Hereinafter, an optical recording medium according to an embodiment of the present invention will be described with reference to FIG. 1. Referring to FIG. 1, a nanometer CD key is formed in a predetermined sector 101 on the recording surface of the optical recording medium 100.

First, when dividing the optical recording medium 100 into three parts from the center hole 103 used when the player is mounted to the player, to the outermost edge of the main body, the nanometer CD key is divided into three equally divided intermediate regions 105b. Or formed in the outer region 105c. Assuming that the optical recording medium 100 is divided into three parts from the center hole 103 to the edge and rotates at an isometric speed, the inner region 105a is a portion that rotates at a low linear speed, and the intermediate region ( 105b) is a portion that rotates at a medium speed linear speed, and the outer region 105c is a portion where data is read while rotating at a high linear speed. The example of FIG. 1 shows that the nanometer cd keys are located in the outer region 105c which rotates at high speed.

When the nanometer CD key is formed in the inner region 105a of the optical recording medium 100, the optical head may not read the normal data recorded on the optical recording medium 100 even in a normal operation state instead of copying. Because it can.

The nanometer cd keys are formed in a predetermined number of sectors. The nanometer CD key is formed such that when the optical recording medium 100 is read by being mounted on the player, the corresponding part cannot be read as data of '0' or '1'. Thus, nanometer cd keys are not real data. The player irradiates the optical recording medium 100 with a laser of a predetermined intensity, and based on the intensity, the reflection angle, and the length of the laser reflected from the lands and pits of the optical recording medium 100, the optical recording medium 100 It is determined whether the data recorded at 100 is '0' or '1'.

Therefore, nanometer cd keys must be formed so that the shape of the land or pit is not read as '0' or '1' by the player. Another way of forming nanometer cd keys is that any of the lands or pits may be formed according to a predetermined specification such that the shape of the laser reflected from the lands or pits themselves is shaped so that the player can read them as '0' or '1'. The combination may be formed such that the player cannot eventually read data as '0' or '1'.

However, even if the sector 101 on which the nanometer CD key is formed cannot be read as '0' or '1' by the player, it is not an empty space in which no land, pits, or similar shapes are formed at all in the portion.

Accordingly, the player performing the copying operation cannot read data after the sector 101 on which the nanometer CD key is formed, and thus the copying does not proceed. Hereinafter, the nanometer cd key will be described in more detail with reference to FIG. 2.

2 is a diagram illustrating a sector in which a nanometer CD key is formed according to an embodiment of the present invention.

FIG. 2A is a plan view of the optical recording medium 100 on which the nanometer CD key is formed, (B) is an enlarged view of a sector in which the nanometer CD key is formed, and (C) is a view of FIG. Fig. 1 is a cutaway sectional view of the rotating circumferential surface of the optical recording medium 100 passing through the sector where the nanometer CD key is formed.

Referring to FIG. 2A, the sector in which the nanometer CD key is formed is provided in the outer region of the optical recording medium 100 corresponding to FIG. 1. The nanometer cd key is formed at a predetermined address as in the identification number a-1. Here, the address indicates the position of a specific track or sector of the optical recording medium 100, and LBA (Logical Block Addressing) or MSF (Minute, Second, Frame) address may be used.

Referring to FIG. 2C, the cut surface of the sector where the nanometer CD key is formed is formed so that data read through the optical head cannot be read as '0' or '1' by the shape as described above. . Such a complicated structure cannot be recognized as normal '0' or '1' data during reading of the laser beam reflected by the optical head. In addition, since the shape of the nanometer CD key is not formed in a pattern repeating formally, this area is used by a copy program or the like to add dummy data in the process of scanning the entire sector for copying. Cannot be processed.

Referring back to FIGS. 2A and 1, it can be seen that the English letter 'CD, DVD COPY PROTECT' is visually recognized in the sector 101 where the nanometer CD key is formed. In other words, when observing the optical record carrier 100 in a direction perpendicular to the center hole 103 of the optical record carrier 100, a combination of irregular shapes such as (c) of the cross section of the sector where the nanometer CD key is formed is obtained. For example, the device may have at least one of letters, numbers, symbols, and figures recognizable by a person. Therefore, in forming a nanometer CD key in a predetermined sector of the optical record carrier 100, information visually recognizable by a human being can be inserted into the sector.

In addition to numbers, letters, symbols, or figures, the planar shape of the nanometer cd keys is a combination of tracks with irregular and complex cross-sectional shapes that are not recognized as data by the player, so that different or irregular patterns can be applied. Of course it is.

Hereinafter, the function of the nanometer cd key will be described. Information about the nanometer CD key is recorded together in a lead in area in which header information of files recorded on the optical recording medium 100 is recorded. In order to read specific data, the player reads the data based on the track and sector addresses of the specific data recorded on the lead-in area. Therefore, if it is not a problem for the player to read predetermined data recorded on the optical recording medium 100 during the normal operation, the nanometer CD key does not interfere with the normal operation.

But in the cloning process, the nanometer cd keys interfere with the copying process. The optical record carrier copying program or copying apparatus (hereinafter, referred to as a copy tool) known to date copies the optical record carrier in batches, and scans the entire optical record carrier for this purpose.

When the optical recording medium 100 of the present invention is mounted on a player for duplication, and the duplication tool scans the entire optical recording medium 100, the data of the sector in which the nanometer CD key is formed is not read and thus duplication is impossible. .

In particular, in the case of some improved duplication tools, a method of inserting predetermined dummy data corresponding to the sectors in preparation for the case where a predetermined number of non-recorded sectors (without lands and pits) are present on the optical recording medium. You can also proceed with the cloning process. However, even in this improved form of replication tool, the nanometer cd keys are regarded as not having data but not being read, so that a certain amount of dummy data cannot be inserted in place of the nanometer cd keys. Therefore, the duplication tool cannot duplicate the optical record carrier 100.

According to another embodiment of the present invention, a search program for searching the corresponding nanometer CD key region may be inserted together with the program and other contents recorded and stored on the optical recording medium 100. Accordingly, a method of distinguishing a genuine optical record carrier and a duplicated optical record carrier will be described. Here, the genuine optical record carrier refers to an optical record carrier on which nanometer cd keys are formed despite legal interpretation.

3 is a flowchart provided to explain a method of detecting a duplicated optical record carrier according to an embodiment of the present invention.

The search program as described above is configured to be automatically executed when the optical recording medium 100 is mounted and executed in the player. Accordingly, when a normal optical record carrier 100 having a nanometer cd key formed thereon is executed in the player, the search program causes the player to seek, access time from the optical record carrier 100 to the nanometer cd key. Time or position information thereof is detected (S301).

The search program may determine whether the detected seek time, the access time, or the location information is the same as a predetermined value (S303), and if so, may determine whether the optical recording medium 100 of the genuine product is not duplicated (S305). ).

As a result of the determination in step S303, when the seek time or the access time or the position information thereof is not detected or different from the preset value, the corresponding optical recording medium or the program may be determined to be copied (S307).

Assuming that the optical record carrier on which the nanometer CD key is formed is replicated by any path, the data of the optical record carrier is duplicated and the search program is copied together. In this case, the replicated data may be transplanted to another optical record medium or to another storage medium such as a magnetic record medium (hard disk, etc.).

When the retrieval program is operated in a player or other computer device with the duplicated data, the actual effect of the retrieval program is exerted. In other words, the retrieval program cannot identify the nanometer CD key from the duplicated optical or magnetic recording media, so that the optical recording medium or the program (or data) is not a genuine optical recording medium or is recorded on the genuine optical recording medium. You can see that it is a duplicate rather than a duplicate.

By the above method, the genuine optical record carrier detecting method according to the present invention is performed.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described in detail above, the optical recording medium according to the present invention forms a predetermined nanometer CD key in some sectors of the recording surface to prevent data from being read during the copying process.

In addition, by storing and recording a program for retrieving such a nanometer CD key along with various contents stored in the optical recording medium, it is possible to prevent the duplicated program from operating.

Claims (4)

When mounted on a player and the entire sector is scanned for duplication, the shape cannot be read as '0' or '1' based on the shape or arrangement of the land or pit. An Nanometer CD Key is formed over a predetermined sector to prevent the duplication, Information about the sector on which the nanometer CD key is formed is recorded in a lead-in area, And dividing the center hole (Hole) and the edge of the recording medium into three, wherein the sector on which the nanometer CD key is formed is provided in the middle or outer region. delete The method of claim 1, When observing the center hole vertically, And at least one of visually recognizable numbers and letters are engraved in the sector on which the nanometer CD key is formed. At least one of seek time, access time, and position information of a nanometer cd key formed over a predetermined sector in a shape that cannot be read as '0' or '1' based on the shape or arrangement of lands or pits from the optical record carrier player. Detecting one piece of information; And And determining that the optical recording medium mounted on the player is a duplicate when the detected information is not the same as a preset value.

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