Patent ID: 7519666

Claim:
A data transmission and reception system for sending and receiving data between a sender and a receiver via a network, comprising: an authorizing server maintaining time information and authorizing a sender server after subjecting the sender server to examination and after the sender server is licensed by the authorizing server to issue electronic postmarks; the sender server being connected to a network to send data via the network, wherein the sender server is authorized by the authorizing server to issue the electronic postmarks; and a receiver server connected to the network to receive the data from the sender server via the network; wherein the sender server issues the time information and attaches the time information to the data to be sent from the sender server, and wherein the received data with the attached time information comprises an email message with an embedded electronic postmark that includes the time information representing a time immediately before the email was sent by the sender server, whereby the time that the email was sent by the sender server is after the email was sent to the sender server by a sender's PC.