| 摘要 |
The fact that electronic content on a network has been opened for perusal by the public is proven, and the probative force required to demonstrate the openness or the lack of alteration of electronic content can be increased. Upon the receipt of a service request from a user who desires to prove that electronic content has been opened for perusal by the public, a service provider preferably selects, from a registered member group, multiple witnesses or certificate generators, and issues certificate generation requests to the selected witnesses or certificate generators. Electronic signatures of the witnesses or the certificate generators are provided for the certificates, to each of which the service provider adds his or her electronic signature, and the certificates are transmitted to the user.
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