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

An information processing method for performing a license obtaining process as a condition for playing back content stored on a removable information recording medium, the information processing method comprising:

• reading, from a removable information recording medium having stored thereon encrypted content data and a content key for decrypting the encrypted content data, identifier data (PID) containing a media ID as identification information of the removable information recording medium and a MAC, at least generated based on the media ID, as alteration verification data, and a product ID corresponding to a set of removable information recording media;
• transmitting the PID and the product ID as license request data to license providing system component entities via a network;
• receiving license data for decrypting the encrypted content data with the content key, wherein the content key is obtained by decrypting an enabling key block (EKB) based on key data provided by a key distribution tree structure;
• receiving, from said license providing system component entities, service data and usage right information as license data;
• executing the enabling key block (EKB) on the basis of the license data and decrypting the encrypted content data stored on said information recording medium.

A computer readable medium storing a program for performing a license obtaining process as playback processing conditions for content stored on a removable information recording medium, said program comprising the steps of:

• reading, from a removable information recording medium having stored thereon encrypted content data and a content key for decrypting the encrypted content data, identifier data (PID) containing a media ID as identification information of the removable information recording medium and a MAC, at least generated based on the media ID, as alteration verification data, and a product ID corresponding to a set of removable information recording media;
• transmitting the PID and the product ID as license request data to license providing system component entities via a network;
• receiving license data for decrypting the encrypted content data with the content key, wherein the content key is obtained by decrypting an enabling key block (EKB) based on key data provided by a key distribution tree structure
• receiving, from said license providing system component entities, service data and usage right information as license data;
• and
• executing the enabling key block (EKB) on the basis of the license data and decrypting the encrypted content data stored on said information recording medium.