| 摘要 |
PROBLEM TO BE SOLVED: To provide a file management device in which there is enhanced the security of each file. SOLUTION: A computer receives plural program files from another computer connected through a network (S2). The computer receives the combination of history numbers respectively selected from a plurality of files from the other computer (S4). The computer extracts data respectively from the received files A, B by using the files A, B and the combination of the history numbers of the files A, B (S6). Then the computer reconstructs data by using the data extracted from respective files A, B.
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