In the document management program and the document management

摘要

Being the document where partial alteration, the partial detection or partial addition of modification and the file of file name were done, it detects the original document without retaining the whole document. When the computer the log output expedient which (1), important document Doc the document A to which (1) at least includes part is brought up, when the signature Sign where it divided document A, divided document DA (1), DA (2)..., DA (m) calculated the signature in respectively, was calculated (1), Sign (2),..., Sign (m) the log which is included is output in the log housing section (5) (2), receiving the detection demand for the original document of the log, Doc (1) signature DSign (1), DSign (2),..., Dsign (j) with, signature Sign (1), Sign (2),..., Sign (m) withIt compares respectively, functioning it can point the document Doc which corresponds to the document A at the time of log output according to the result the document itself detection expedient which detects the original document where (1) forms part (3), as.