Patent ID: 8036513
Filing Date: 2011-10-11
Classification: G11B,H04N

Abstract:
1. A playback apparatus that plays back an application program and a digital stream in conjunction with each other, the playback apparatus comprising: a reading unit operable to read a file recorded on a read-only recording medium mounted to the playback apparatus; a storing unit storing therein (i) a plurality of files, (ii) merge management information which specifies a file out of the plurality of files that is to be used in combination with what is recorded on the read-only recording medium, and (iii) signature information which is used for judging authenticity of the merge management information; a judgment unit operable to judge the authenticity of the merge management information based on the signature information; a package management unit operable to (a) in a case where the merge management information is judged to be authentic, generate package information that indicates a new file structure obtained by adding the file specified by the merge management information to a file structure of the read-only recording medium and (b) in a case where the merge management information is judged to be inauthentic, not generate the package information that indicates the new file structure; a playback unit operable to playback the digital stream either recorded on the read-only recording medium or stored in the storing unit based on the package information generated by the package management unit; and an execution unit operable to execute the application program either recorded on the read-only recording medium or stored in the storing unit based on the package information generated by the package management unit.