Optical disc, illegal copy finding system and method using optical disc, optical disc manufacturing apparatus and optical disc manufacturing method

Abstract

An optical disc manufacturing apparatus ( 46 ) recording a BCA code constituted by plural marks and including a secret code which is modulated in a range capable of recognizing a position in a radial direction of an optical disc and/or a position in a track direction of the plural marks as the BCA code, a BCA history database ( 44 ) storing a history including a correspondence between the BCA code of an optical disc ( 1 a ) recording the BCA code and the secret code, and a management center ( 30 ) reading the BCA code and the secret code recorded on the optical disc so as to compare both on the basis of input of the correspondence between the BCA code and the secret code stored in the BCA history database ( 44 ) are employed, whereby an illegally manufactured optical disc ( 1 z ) can be easily found by inspecting the recorded BCA code and secret code.

1 . (canceled) 
   
   
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       4 . An optical disc manufacturing apparatus manufacturing an optical disc, comprising:
 a recording means for recording the BCA code constituted by a plurality of marks and including a secret code which is modulated in accordance with a previously determined procedure in a range capable of recognizing a position in a radial direction of the optical disc and/or a position in a track direction of said plurality of marks as the BCA code, on the optical disc.   
   
   
       5 . An optical disc manufacturing method of manufacturing an optical disc, comprising:
 a recording step of recording the BCA code constituted by a plurality of marks and including a secret code which is modulated in accordance with a previously determined procedure in a range capable of recognizing a position in a radial direction of an optical disc and/or a position in a track direction of said plurality of marks as the BCA code, on the optical disc.   
   
   
       6 . (canceled) 
   
   
       7 . An optical disc manufacturing apparatus as claimed in  claim 4 , wherein said recording means comprises:
 an optical head irradiating a laser spot light on the optical disc;   a BCA code memory for forming the BCA code constituted by a plurality of marks in the track direction by said laser spot light;   a secret code memory storing a secret code modulated in accordance with a previously determined procedure in a range capable of recognizing positions in the radial direction of the optical disc and/or positions in the track direction of a plurality of marks forming the BCA code as the BCA code, with respect to the BCA code stored in said BCA code memory; and   a microprocessor controlling the BCA code and the secret code with respect to said optical head output control portion, and   wherein said microprocessor constitutes an optical disc manufacturing apparatus or a BCA code recording apparatus which records the BCA code including the secret code on the optical disc surface by modulating the BCA code by using the secret code stored in said secret code memory while moving an optical head in the radial direction of the optical disc.   
   
   
       8 . An optical disc manufacturing method as claimed in  claim 5 , wherein said recording step uses an optical head irradiating a laser spot light on the optical disc, a BCA code memory for forming the BCA code constituted by a plurality of marks in the track direction by said laser spot light, and a secret code memory storing a secret code modulated in accordance with a previously determined procedure in a range capable of recognizing positions in the radial direction of the optical disc and/or positions in the track direction of a plurality of marks forming the BCA code as the BCA code, with respect to the BCA code stored in said BCA code memory, and wherein said optical head records the BCA code including the secret code on the optical disc surface by modulating the BCA code by using the secret code stored in said secret code memory by irradiating a laser spot light on the optical disc while moving in the radial direction of the optical disc. 
   
   
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       12 . An optical disc manufacturing apparatus manufacturing an optical disc, comprising:
 a recording means for recording the BCA code constituted by a plurality of marks and including a secret code which is modulated in accordance with a previously determined procedure in a range capable of recognizing a length in a radial direction of the optical disc and/or a width in a track direction of said plurality of marks as the BCA code, on the optical disc.   
   
   
       13 . An optical disc manufacturing method of manufacturing an optical disc, comprising:
 a recording step of recording the BCA code constituted by a plurality of marks and including a secret code which is modulated in accordance with a previously determined procedure in a range capable of recognizing a length in a radial direction of an optical disc and/or a width in a track direction of said plurality of marks as the BCA code, on the optical disc.   
   
   
       14 . (canceled) 
   
   
       15 . An optical disc manufacturing apparatus as claimed in  claim 12 , wherein said recording means comprises:
 an optical head irradiating a laser spot light on the optical disc;   a BCA code memory for forming the BCA code constituted by a plurality of marks in the track direction by said laser spot light;   a secret code memory storing a secret code modulated in accordance with a previously determined procedure in a range capable of recognizing the lengths in the radial direction of the optical disc and/or the widths in the track direction of a plurality of marks forming the BCA code as the BCA code, with respect to the BCA code stored in said BCA code memory; and   a microprocessor controlling the BCA code and the secret code with respect to said optical head output control portion, and   wherein said microprocessor constitutes an optical disc manufacturing apparatus or a BCA code recording apparatus which records the BCA code including the secret code on the optical disc surface by modulating the BCA code by using the secret code stored in said secret code memory while moving an optical head in the radial direction of the optical disc.   
   
   
       16 . An optical disc manufacturing method as claimed in  claim 13 , wherein said recording step uses an optical head irradiating a laser spot light on the optical disc, a BCA code memory for forming the BCA code constituted by a plurality of marks in the track direction by said laser spot light, and a secret code memory storing a secret code modulated in accordance with a previously determined procedure in a range capable of recognizing the lengths in the radial direction of the optical disc and/or the widths in the track direction of a plurality of marks forming the BCA code as the BCA code, with respect to the BCA code stored in said BCA code memory, and wherein said optical head records the BCA code including the secret code on the optical disc surface by modulating the BCA code by using the secret code stored in said secret code memory by irradiating a laser spot light on the optical disc while moving in the radial direction of the optical disc. 
   
   
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       24 . An optical disc manufacturing apparatus as claimed in  claim 4 ,  7 ,  12  or  15 , wherein the marks of said BCA code are constituted by a plurality of bars extending in the radial direction of the optical disc, a width of said bar, a position of said bar in the radial direction of the optical disc, a distance between an innermost peripheral end side and an outermost peripheral end side on the basis of a rotation center of the optical disc, a distance between centers of said bars in the disc track direction, and a distance between bar starting ends are standardized, and the secret code is included in the BCA code by changing said bar recording position within said plurality of standards. 
   
   
       25 . An optical disc manufacturing method as claimed in  claim 5 ,  8 , or  13 , wherein the marks of said BCA code are constituted by a plurality of bars extending in the radial direction of the optical disc, a width of said bar, a position of said bar in the radial direction of the optical disc, a distance between an innermost peripheral end side and an outermost peripheral end side on the basis of a rotation center of the optical disc, a distance between centers of said bars in the disc track direction, and a distance between bar starting ends are standardized, and the secret code is included in the BCA code by changing said bar recording position within said plurality of standards.