| http://www.w3.org/ns/prov#value | - The communication contents certification system 10 comprises party communication terminals 13 a and 13 c that are a first communication terminal for transmitting an electronic mail or a second communication terminal for receiving an electronic mail, attorney communication terminals 13 b and 13 d, a telecommunication line 12 such as the Internet or the like for communicating an electronic mail or t
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