Cryptography – By modifying optical image
Patent
1995-03-28
1997-05-06
Cangialosi, Salvatore
Cryptography
By modifying optical image
380 4, H04L 900
Patent
active
056278950
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electronic device for reading information stored in an information storage medium and more, particularly, an information processing device for optically reading program information stored in a CD-ROM to play a game.
BACKGROUND ART
Musical CDs and data information CD-ROMs can be reproduced by CD drives as long as they meet standards even if they are counterfeits. This does not cease counterfeit manufacturers. As a countermeasure to this, various security systems have been proposed for the prevention of unauthorized copying game softwares which have been developed as results of large investments of a large number of man powers and much time.
A new security system for CD-ROMs are proposed in Japanese Patent Application No. Hei 05-185740/1993, and International Application PCT/JP 94/01243 filed based on the priority claimed from the Japanese patent application. This security system detects whether or not specific indications, such as trademarks or others, are indicated at predetermined parts of CD-ROM discs, whereby the discs are judged to be genuine products or counterfeits.
In the security system proposed in the above-described applications, when a specific indication is read, the entire specific indication is read, which unavoidably requires a certain reading time. Especially in a case that a specific indication is visibly displayed on an information storage surface with using a group of pits over a plurality of tracks, all said tracks have to be read, which takes much reading time.
One object of the present invention is to provide an electronic device with a new security system built in, which can effectively reject or exclude counterfeit products.
Another object of the present invention is to provide an electronic device and an information processing method which can reduce a reading time of reading a specific security indication.
Another object of the present invention is to provide an electronic device and an information processing method which provides added security against counterfeiting.
Another object of the present invention is to provide an electronic device and an information processing method which can effectively expel or exclude counterfeit information storage mediums from the market even when security systems are released.
Still another object of the present invention is to provide an information processing method which can effectively reject or exclude use of counterfeit information storage mediums.
DISCLOSURE OF INVENTION
The electronic device according to one embodiment of the present invention comprises a medium mounting unit on which an information storage medium having visually recognizable indication information is to be mounted, a detection unit for detecting specific information selected out of unit information constituting the indication information, and an output unit having reference information corresponding to the indication information, said output unit comparing the specific information with comparison information in the reference information corresponding to the specific information and generating an output of the compared result.
According to this embodiment, all of information of an indication for the security check is not required to be detected. Thereinstead, information of a selected part of the indication is detected, whereby a reading time of information of the indication can be short.
The electronic device according to another embodiment of the present invention is characterized in that said detection unit includes a selection unit selecting at random the specific information out of the unit information.
According to this embodiment, the specific part to be selected from a unit information constituting the indication information is changed at random for every read out, so that when a counterfeiter makes an information storage medium agreeable or compatible to the electronic device of the present invention, he has to illegally use the same indication as indication information born by an authentic information s
REFERENCES:
patent: 4785361 (1988-11-01), Brothby
patent: 4967286 (1990-10-01), Nomula et al.
patent: 5027396 (1991-06-01), Platteter et al.
patent: 5233436 (1993-08-01), Oskman et al.
patent: 5418852 (1995-05-01), Itami et al.
Cangialosi Salvatore
Sega Enterprises Ltd.
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