| 摘要 |
A time stamp range designating unit is provided in a communication device, such as, for example, an Internet facsimile machine. A range for acquiring time stamp data is designated for an electronic file, and acquired time stamp data and the electronic file are associated by using an ID. The electronic file is transmitted to a remote device. After the electronic file has been edited by the remote device and returned, the time stamp data is acquired from the ID and a verification of the electronic file is carried out to detect whether or not the electronic file has been falsified.
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