| 摘要 |
The present invention discloses an art to enable users to easily confirm the electronic file is authorized file. More particularly, a summarized value for the electronic file is retained in a document history management system and the electronic file is retained in a document management system upon input of the electronic file for authorizing the original entity. Under the condition, conformity or non-conformity between the summarized value obtained from the electronic file in the document management system and the corresponding summarized value in the document history management system is determined upon input of confirmation request for verifying the electronic file is authorized file. When the result of the determination indicates the conformity of the two summarized values, a certificate describing that the electronic file is not interpolated and that the electronic file is the latest is issued. |
