JP2000105970A - Copy preventing method for cd-rom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a copy preventing method in a form using an ordinary CD-ROM drive. SOLUTION: Since a subdata area 2 where errors are to be generated at the time of reading is prepared at the arbitrary part in the area of the main data 1 of a CD-ROM and this media (a) can not be read out as it is in an ordinary CD-R or the like and the software in this CD-ROM is decided by whether it is an original or a copy based on an algorithm (b), this media (a) can not be used even when it is force-copied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copy protection method for a CD-ROM, and more particularly to a copy protection method for a CD-ROM using an error code correction code.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional method for preventing copying of a CD-ROM is such that when software for a CD-ROM is installed or started, a series of alphanumeric characters is input from a keyboard in accordance with instructions of the software, and the software is internally protected. Use the alphanumeric input method that matches the data provided in
-Use a ROM reader to read incompatible media in a special format. In the alphanumeric input method, copy a character string for copy protection on a paper base and copy the media to a CD-R device. The exclusive format using the CD-ROM device impairs the distribution as a CD-ROM.

[0003]

In the conventional CD-ROM copy protection method, the trouble of inputting a string of alphanumeric characters with an input device such as a keyboard or the incompatible CD-ROM media with a special CD-ROM device is required. There were issues that had to be prepared.

An object of the present invention is to provide a copy protection method for a CD-ROM in which a data area that cannot be corrected by an error code correction code is provided to discriminate an original and prevent copying.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a copy protection method for a CD-ROM according to the present invention uses an error code correcting code to correct a main data area of a medium which can be corrected by an error code correcting code. A sub data area which cannot be provided is provided, the data is read from the sub data area when the data in the main data area is copied, and when a reading error occurs, the medium is determined to be original and data copying is prevented. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a copy protection method for a CD-ROM according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a CD according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a ROM copy protection method.

[0008] CD-ROM according to one embodiment of the present invention
In the copy protection method of FIG. 1, as shown in FIG. 1, data of an error code correction code (hereinafter, referred to as ECC) is added to a medium a for each sector unit. The data is corrected so as not to cause an error, and the main data area 1 that can be corrected by the ECC in the data area where the software is stored, and the data area that is not normally read or cannot be corrected by the ECC that has an area secured so as not to be read. The algorithm b for determining the original in the software included in the main data area 1 that can be corrected by the ECC and the sub data area 2 that can be corrected (the total number of data on the medium a is checked and the sub-code where an uncorrectable reading error occurs in the ECC) The data area 2 is read, and the original is determined by the occurrence of an error).

Next, a CD-ROM according to an embodiment of the present invention will be described.
The operation of ROM copy protection will be described with reference to the drawings.

A CD-ROM according to an embodiment of the present invention
As shown in FIG. 1, the operation of the copy protection method is to read and duplicate the medium a sequentially without using a file system or the like (many copies on a commercially available CD-R). When the data area is generated and the data area is forcibly copied except for the sub data area 2, the software stored in the medium a is started, and the total data size of the main data area 1 and the sub data area 2 is determined by the algorithm b. Is checked, if the value is different from the expected value, the operation is interrupted and the sub-data area 2 is read from the algorithm c. If no error occurs, the operation is interrupted as a copy product. The operation of the software is continued as a.

[0011]

As described above, the CD-R of the present invention is
According to the OM copy protection method, there is no need to input alphanumeric characters for discriminating the original or to prepare a dedicated drive device, and there is an effect of preventing duplication of media on a normal CD-R.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a CD-ROM copy protection method according to an embodiment of the present invention.

FIG. 2 is an algorithm of a conventional CD-ROM copy protection method.

[Explanation of symbols]

 1 main data area 2 sub data area a media b algorithm

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 572 G11B 20/18 572F

Claims (1)

[Claims] 1. A sub data area that cannot be corrected by an error code correction code is provided in a main data area of a medium that can be corrected by an error code correction code, and the sub data area is read when data of the main data area is copied. CD-RO, wherein when a reading error occurs, the medium is determined to be original and data copying is prevented.
M copy protection method.