| 摘要 |
PROBLEM TO BE SOLVED: To obtain a safe printing system capable of preventing printing data from being leaked to the outside. SOLUTION: A printing requester 1 issues a printing request including printing request issue time, a printing starting period, etc. At the time of receiving the printing request, a printer 2 judges whether the request is issued within the printing period or not by using an expiration judgment device 3, a timer device 4, etc., on the basis of the printing request issue time included in the request. When the request is within the period, the request is executed, and when the request is out of the period, the request is rejected.
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