Recording Medium, and Contents Reproduction System

A content reproduction system comprising a recording medium, a read device, and a reproduction device, wherein the recording medium, on which encrypted content is recorded, comprises:

• a data recording area in which data is recorded according to a predetermined file system, and
• a lead-in area in which data is recorded without using the file system;
• in the data recording area, key information is recorded that includes software usage information and device usage information, the software usage information being generated by encrypting medium information assigned to the recoding medium based on software-specific information specific to content reproduction software that uses the content, and the device usage information being generated by encrypting the medium information based on device-specific information specific to the read device;
• in the lead-in area, position information indicating the recording position of the key information in the data recording area is recorded;
• the read device, which reads the encrypted content from the recording medium, comprises:
• a position information acquiring unit operable to acquire the position information from the lead-in area, and
• a position specification unit operable to specify the recording position of the key information based on the acquired position information, and
• a read unit operable to read the key information from the specified recording position;
• the reproduction device, which reproduces content, comprises:
• a storage unit operable to store the content reproduction software, and
• an execution unit operable to read the content reproduction software from the storage unit and execute the content reproduction software;
• and
• the content reproduction software includes:
• a key information acquisition instruction that instructs to acquire the key information from the recording medium using the predetermined file system, and
• a content reproduction instruction that instructs to reproduce the content using the key information.

A reproduction device that reproduces content, the reproduction device comprising:

• a storage unit operable to store content reproduction software that reproduces the content and software-specific information specific to the software, and
• an execution unit operable to read the content reproduction software from the storage unit and execute the content reproduction software;
• wherein the content reproduction software includes:
• a content acquisition instruction that acquires, from the recording medium, encrypted content generated by encrypting the content based on medium information assigned to the recording medium, and
• a key information acquisition instruction that instructs to acquire, from the recording medium, key information including software usage information generated by encrypting the medium information based on the software-specific information, and
• a content reproduction instruction that instructs to reproduce the content using the key information.