Patent ID: 8582958
Filing Date: 2013-11-12
Classification: H04N

Abstract:
1. A playback device comprising: a read unit operable to read an application program from a read-only recording medium; a program execution unit operable to execute the application program read by the read unit; a connection unit to which a local storage is removably connected; and a virtual file control unit operable to construct a virtual package by combining a file structure of the local storage with a file structure of the read-only recording medium, wherein the local storage stores therein a state signaling file, a file path of the state signaling file on the virtual package not corresponding to any file recorded on the read-only recording medium, and the program execution unit determines, while the local storage is connected, whether the virtual package is in a prepared state or in a valid state by attempting to access the state signaling file using the file path on the virtual package.