Information recording medium, information processing apparatus, information processing method, and computer program

Abstract

There are provided an information recording medium, and an information processing apparatus and method by which content usage in compliance with copyright protection is made possible in information processing devices such as a CD player and a PC. In the information recording medium, a first data storage area on which a copying prevention process is performed, and a second data storage area in which is stored an encrypted content file containing encrypted content, and encrypted key data such that key data for use in a decryption process is encrypted and which can be decrypted only in a device having a license are set. It becomes possible to play back the recorded content of a first data recording field in a playback device such as a CD player, and even in an information processing device, such as a PC, it is possible to decrypt and play back encrypted content of a second data recording field under the condition of obtaining a license.

1 . An information recording medium having stored thereon content data, said information recording medium comprising: 
 a first data storage area, which is set as a content storage area on which a copying prevention process is performed; and    a second data storage area, which is a content storage area on which a copying prevention process is not performed and in which is stored an encrypted content file containing encrypted content and encrypted key data such that key data for use in a process for decrypting the encrypted content is encrypted and which can be decrypted only in a device having a license.    
   
   
       2 . An information recording medium according to  claim 1 , wherein the encrypted content in the encrypted content file stored in said second data storage area is 
 content which is encrypted by a content key Kc as an encryption processing key, and said content key Kc is set as a key which can be obtained by performing a process including a process for decrypting an enabling key block (EKB) based on key data provided using a key distribution tree structure.    
   
   
       3 . An information recording medium according to  claim 1 , wherein data stored in said second data storage area contains 
 a program for executing a process for reading identification information required to obtain a license from the information recording medium.    
   
   
       4 . An information recording medium according to  claim 1 , wherein said second data storage area is structured in such a manner that 
 identifier data (PID) having a media ID serving as an identifier unique to the information recording medium and a MAC as alteration verification data is stored.    
   
   
       5 . An information recording medium according to  claim 4 , wherein said second data storage area is structured in such a manner that 
 a product ID serving as an identifier, which is set for each product corresponding to a set of a plurality of information recording media is stored, and combination data of said media ID and the product ID is structured as a global unique identifier.    
   
   
       6 . An information recording medium according to  claim 1 , wherein a content file stored in said second data storage area contains 
 content data (Enc (Kc, Content)) which is encrypted by a content key [Kc], content key data (Enc (Kroot, Kc)) which is encrypted by a root key [Kroot], and an enabling key block (EKB) from which the root key [Kroot] can be obtained by a decryption process using a device node key (DNK) stored in service data as license data.    
   
   
       7 . An information recording medium according to  claim 1 , wherein said first data storage area and said second data storage area each have a multi-session structure, which is set as independent session areas formed by a lead-in area indicating a data starting area, a content storage area, and a lead-out area indicating a data ending area.  
   
   
       8 - 12 . (canceled)