Playback device, playback method, playback program, and integrated circuit

A playback method comprising the steps of:

• reading an application program, image data, a video stream, and an application management file from a recording medium;
• executing the application program;
• storing the image data into an image data area in a memory unit;
• playing back video data with use of the image data and the video stream in accordance with the application program;
• forcibly terminating the application program even when the application management file specifies the continuous execution of the application program;
• and
• changing the image data area after the termination of the application program.

A program for causing a playback device to execute the steps of:

• reading an application program, image data, a video stream, and an application management file from a recording medium;
• executing the application program;
• storing the image data into an image data area in a memory unit;
• playing back video data with use of the image data and the video stream in accordance with the application program;
• forcibly terminating the application program even when the application management file specifies the continuous execution of the application program;
• and
• changing the image data area after the termination of the application program.

An integrated circuit implemented in a playback device,

• the playback device including:
• a reading unit operable to read an application program, image data, a video stream, and an application management file from a recording medium;
• and
• a playback unit operable to play back video data with use of the image data and the video stream,
• the integrated circuit comprising:
• a virtual machine unit operable to execute the application program read by the reading unit from the recording medium;
• a memory unit including an image data area for storing the image data;
• and
• a management unit operable to refer to the application management file read by the reading unit from the recording medium, and in accordance with the application management file, instruct the virtual machine unit to start and terminate the application program and instruct the memory unit to change the image data area, the management unit further operable to cause the virtual machine unit to forcibly terminate the application program before instructing the memory unit to change the image data area even when the application management file specifies the continuous execution of the application program.