Electronic device for detecting selected visually perceptible indication information on an information storage medium for security comparison

A CD-ROM device comprising:

• a CD-ROM mounting unit on which is detachably mounted a CD-ROM having a region formed with a predetermined visual indication, said visual indication having an area size and a property which enables it to be visually recognizable as the visual indication;
• a storing means which stores a reference information representative of said predetermined visual indication;
• a detection unit having a selection unit which selects at random part of said region and means for detecting said selected part of the region to output information indicative of part selected at random out of said predetermined visual indication;
• and
• a comparison unit comparing said information with comparison information in the reference information corresponding to said selected part of the region and generating an output of the compared result.

An electronic device comprising:

• a disc mounting unit on which is to be detachably mounted a disc having an information recorded region with information recorded with pits and a predetermined region defined over a plurality of tracks;
• a detection unit having a selection unit which selects at least one out of said plurality of tracks and means for detecting the predetermined region on said selected at least one track, said selected at least one track being less in number than said plurality of tracks;
• a storing unit which stores reference information indicative of a specific visual indication which should be formed on said predetermined region, said specific visual indication having an area size and a property which enables it to be visually recognizable as the visual indication when said disc is an authorized one;
• and
• a judging unit comparing information obtained from the selected at least one track with said reference information to judge whether or not the specific visual indication is indicated visually recognizably on the predetermined region.

An electronic device comprising:

• a disc mounting unit on which is to be detachably mounted a disc having a region with program information recorded with pits, a predetermined region defined over a plurality of tracks, and a region with a specific visual indication, said visual indication having of an area size and a property which enables it to be visually recognizable as the visual indication and being formed with an aggregation of pits within said predetermined region;
• a detection unit having a selection unit which selects at least one of said plurality of tracks and means for detecting said specific visual indication on said selected at least one track, said selected at least one track being less in number than said plurality of tracks;
• a storing unit which stores reference information corresponding to said specific visual indication;
• and
• a comparison unit comparing the information obtained from said detection unit with said reference information.

An information processing device comprising:

• a storing unit which stores reference information corresponding to a specific visual indication the use of which is legally prohibited to a person other than those authorized;
• a disc mounting unit on which is to be detachably mounted a disc having an information recorded region with information recorded with pits, and a predetermined region defined over a plurality of tracks on which said specific visual indication is formed, said visual indication being of an area size and a property which enables it to be visually recognizable and being formed with an aggregation of pits;
• a selection unit selecting at least one of said tracks at random out of said plurality of tracks, said selected at least one track being less in number than said plurality of tracks;
• a detection unit optically detecting information recorded with pits from said predetermined region on said selected at least one track;
• a comparison unit comparing the information obtained from said selected at at least one track with said reference information;
• and
• a reading unit reading the information in said information recorded region in response to an output from said comparison unit when the information obtained from said selected at least one track agrees to the information in said reference information corresponding to said selected at least one track.

An electronic device comprising:

• a reference information storing unit which stores reference information representative of a visual indication,
• a disc mounting unit on which is to be detachably mounted a disc having an information recorded zone with information recorded with pits, an indication forming zone defined different from said information recorded zone, and a plurality of indication regions defined in said indication forming zone, each of said plurality of indication regions having the visual indication, said visual indication being formed of an area size and a property which enables it to be visually recognizable as the visual indication and with an aggregation of pits;
• a selection unit selecting at random an indication region out of said plurality of indication regions;
• a detection unit optically detecting information indicative of the visual indication recorded with pits in said selected indication region;
• a comparison unit comparing the information detected out of said selected indication region with said reference information;
• and
• a control unit operable in response to an output from said comparison unit.

An information processing method for checking an authenticity of an information storage medium, comprising the steps of:

• mounting the information storage medium on an electronic device, said information storage medium having a region on which a predetermined visual indication is formed, said visual indication having an area size and a property enabling it to be visually recognizable as the visual indication by human eyes as well as of a property enabling it to be optically readable by said electronic device,
• selecting an area part of said region;
• optically detecting said area part of the region so as to output information indicative of the part selected out of said predetermined visual indication on said information storage medium;
• and
• comparing the detected information with reference information representative of said predetermined visual indication and stored in said electronic device.

A game device comprising:

• a disc control means on which is detachably mounted a disc having a first region on which a game program and data is stored and a second region on which a visual indication is formed, said visual indication being of an area size and a property enabling it to be visually recognizable as the visual indication and also having a property enabling it to be readable by the disc control means;
• a reference data storing means which stores a reference data representative of said visual indication;
• selection means for selecting part of said second region, said selected part being less than the whole area of said second region;
• detection means for detecting said selected part to output a data indicative of the selected part of said visual indication;
• comparison means for comparing said detected data with said reference data;
• and
• a game control means operable in response to an output from said comparison means.

A game device comprising:

• a disc control means on which is detachably mounted a disc having a first region on which a game program and data is stored with pits so as to be optically readable by the disc control means and a second region defined over a plurality of tracks on which a visual indication is formed with an aggregation of pits, said visual indication being of an area size and having a property which enables it to be visually recognizable as the visual indication also having a property enabling it to be optically readable by the disc control means;
• a reference data storing means which stores a reference data representative of said visual indication;
• selection means for selecting at random at least one of said plurality of tracks, said selected at least one track being less in number than the whole of said plurality of tracks;
• detection means for detecting said selected at least one track so as to output detected data representative of part of said visual indication;
• comparison means for comparing the detected data with said reference data;
• and
• a game control means operable in response to an output from said comparison means.