| 摘要 |
An IP telephone apparatus includes a recording unit, a timestamp token obtaining unit, an operation unit and a data accumulation unit. The recording unit generates recorded data by recording a voice. The timestamp token obtaining unit obtains a timestamp token including encrypted data of the recorded data or digest-data thereof with time information attached. The operation unit initiates the timestamp token obtaining process of the timestamp token obtaining unit. The data accumulation unit accumulates, together with the recorded data, the timestamp token obtained by the timestamp token obtaining unit. By using the IP telephone apparatus, notarized recorded data can be easily obtained and freely handled.
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