A data transmission server can cause identification information of a user who sent data and identification information of the user contained in the data to correspond to each other on one-to-one basis so as to prevent a person from transmitting data by pretending to be others. A memory stores client...http://www.google.de/patents/US7610612?utm_source=gb-gplus-sharePatent US7610612 - Data transmission method, a data transmission program and a data transmission server
