Optical recording medium preventing illegal dublication, and a method for manufacturing and reproducing the same, and an authentication method using the same

In a method for manufacturing an optical recording medium including an authentication data region and a recording data region, the method comprising:

• recording at least one intentional error data portion on the authentication data region;
• and
• storing an officially certified product determining program that stores authentication information corresponding to the recorded intentional error data in the recording data region.

In a method for reproducing an optical recording medium is readable by a computer, a method for reproducing an optical recording medium having a duplication preventing function comprising:

• extracting intentional error data recorded on the optical recording medium, and extracting authentication information that is stored in an officially certified product determining program provided on the optical recording medium and that corresponds to the intentional error data;
• and
• comparing the intentional error data with the authentication information to determine duplication states of the optical recording medium.

An authentication method of an authentication system connected to a computer to which an optical recording medium on which intentional error data are recorded is provided via a network, and that stores authentication information corresponding to the intentional error data, the method comprising:

• extracting the intentional error data recorded on the optical recording medium;
• and
• comparing the extracted intentional error data with the previously stored authentication information and checking authentication states.