Patent ID: 8184946

Claim:
A recording/editing apparatus that controls recording of a file for playback and a plurality of management information pieces onto a readable and writable recording medium, and editing of the file for playback and the management information pieces recorded on the recording medium, the management information pieces each defining items used for playback control of the file for playback, the recording/editing apparatus comprising: a recording unit operable to record definition count information onto the recording medium, the definition count information indicating, for each of the items, a count of definitions that have been already provided in the corresponding item; a first signing unit operable to generate first signature information from information of a state of each management information piece as of a time the definition count information is recorded by the recording unit; a signature recording unit operable to record the first signature information onto the recording medium; a second signing unit operable, upon a request for the recording and the editing, to generate second signature information from the information of a state of each management information piece as of a time the request is received; and a permitting unit operable to permit the recording and the editing upon the request, on a condition that none of values of the definition count information has reached a maximum count of definitions in the corresponding item recordable on the recording medium and that the fist signature information is identical to the second signature information.