| http://www.w3.org/ns/prov#value | - The transmitting-end terminal device 1 then produces digital signature data using a private key of the sender and supplies, to the POB server 4, the produced digital signature data, a message indicating a request for transmission of the electronic mail, and an SDP file including information associated with the video data included in the electronic mail. [0098] Referring to a flow chart shown in FI
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