| 摘要 |
PROBLEM TO BE SOLVED: To achieve efficient and highly reliable management, in the management of the reception state of a data file using the unique ID of the file. SOLUTION: A data recording device holds use state information which is updated according to the use of the device and represents the use state of the device, and device identification information unique to the device. Upon recording data, the data recording device acquires information on generation of recording data, which is different from the device state information, as recording information, in association with the recording data. The device generates unique identification information of the recording data on the basis of the device identification information, the device state information, and the recording information, and records a file including the recording data and the unique identification information in a recording medium. Here, as regards the file stored in the recording medium, when contents of the recording data are changed, new unique identification information is generated and a file including the recording data having been changed and the new unique identification information is recorded in the recording medium. COPYRIGHT: (C)2008,JPO&INPIT
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