| http://www.w3.org/ns/prov#value | - In FIG. 4, the distributed time stamping system 103 comprises: a reception unit 130 for receiving a digital document M by communications; a plurality of time acquisition units 133 a, 133 b, . . . , 133 s for acquiring time information t1i, tsi, . . . , tsi having a constant incremental time unit, independently for n times where n is an integer at least greater than or equal to one, at a constant a
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