Optical disk having anti-piracy function and method of fabricating and authenticating the optical disk

Abstract

The present invention relates to an optical disk having data duplication prevention function, a method of authenticating such optical disk, and a method of fabricating such optical disk discriminated from a duplicated disk. For the optical disk, a prescribed field of subcode data, which is obtained from data recorded in a program area, is set to a value in such a manner that the value is different from that in the corresponding field of table-of-content data which is recorded in a lead-in area. Or reproduction control information associated with data recorded in a prescribed region in the program area is recorded in the reverse order. Depending on the existence of these unusual data patterns, the optical disk is judged as a legitimate production or an illegal production.

What is claimed is:  
     
         1 . An optical storage medium having some reproduction control information for recorded data are recorded in the reverse order in an area.  
     
     
         2 . An optical storage medium according to  claim 1 , wherein a program judging whether the reproduction control information is in the reverse order or not is recorded in other areas.  
     
     
         3 . An optical storage medium according to  claim 2 , wherein the program executes the steps of: 
 reading out recorded data units having a predetermined size from the area on the optical storage medium loaded; and    (b) checking whether or not reproduction control information corresponding to the data unit within the read-out data is in the reverse order.    
     
     
         4 . An optical storage medium according to  claim 1 , wherein the reproduction control information is reproduction time information which is provided for each recorded data unit having a predetermined size.  
     
     
         5 . An optical storage medium according to  claim 1 , wherein the reproduction control information is frame number which is provided for each recorded data unit having a predetermined size.  
     
     
         6 . A method of fabricating an optical storage medium, comprising the steps of: 
 recording data in the optical storage medium in units of data of a predetermined size sequentially;    reversing reproduction control information associated with two arbitrarily chosen data units having the predetermined size; and    recording the reversed reproduction control information in the optical storage medium, together with the corresponding data units.    
     
     
         7 . An apparatus for fabricating an optical storage medium, comprising: 
 means for dividing data being inputted for recording in units of data of a predetermined size;    means for generating reproduction control information for each data unit having the predetermined size;    means for selectively reversing the order of the reproduction control information;    means for combining the data unit and the its reversed reproduction control information; and    means for recording the combined data into the optical storage medium.    
     
     
         8 . A method of authenticating an optical storage medium loaded, comprising the steps of: 
 reading out data from a predetermined area in the optical storage medium;    checking whether or not a reproduction control information within the read-out data is in the reversed order; and    determining whether the optical storage medium is an original or not based upon the checking result.