| http://www.w3.org/ns/prov#value | - Referring again to FIG. 9, the attribute information of the file such as copyright information and important information of the file and the information serving as a key that is peculiar to the file, for example, the contents key used at the time when the actual data portion of the file is encrypted are read out from the file #1 recorded on the disk 230 and supplied to an MAC arithmetic operating
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