Patent ID: 8326120

Claim:
A playback apparatus for playing a digital stream in conjunction with an application executing in the playback apparatus, comprising: a package manager operable to generate package information by merging a first file recorded on a first recording medium and a second file recorded on a second recording medium, in accordance with merge management information recorded on the second recording medium, the merge management information indicating: the second file on the second recording medium for merging with the first file on the first recording medium; and a first filename for accessing the second file as a file in the package information; a switcher operable to switch an access destination of a specified file that is specified as a file in the package information to: the second file on the second recording medium when a second filename of the specified file is indicated in the merge management information; and the first file on the first recording medium when the second filename of the specified file is not indicated in the merge management information; a selector operable to detect a plurality of titles from the package information and to select one of the plurality of titles as a current title; an application executor operable to execute an application associated with the current title, the application being operable to request the package manager to generate new package information using new merge management information, the new merge management information indicating: a third file on the second recording medium for merging with the first file on the first recording medium; and a third filename for accessing the third file as a file in the new package information; and a playback controller operable to control playback of the digital stream associated with the current title, wherein the package manager sets the third file to read-only when the application requests generation of the new package information, and the package manager generates the new package information when the playback of the digital stream stops due to a change of the current title.