| 摘要 |
When executing e-document scan, an image scanning device scans a document and stores scanned data. After resetting a timer, the image scanning device calculates a hash value of the scanned data, and transmits the calculated hash value to a TSA to request the TSA to issue a timestamp. When receiving a timestamp from the TSA, the image scanning device stores the scanned data and the timestamp in an e-document folder. When failing to receive a timestamp within a prescribed period of time after requesting the timestamp, the image scanning device adds a comment to the scanned data indicating that the timestamp failed to be received, and prints out the scanned data with the comment.
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