Abstract: The present invention is to provide a method of safely sending encrypted e-mails over LAN comprising the steps of installing a LAN access program on a wireless communication device; connecting the wireless communication device to a LAN; setting LAN access conditions in the LAN access program prior to sending e-mail; and enabling a CPU of the wireless communication device to perform the sub-steps of performing an authorization at a server based on the LAN access conditions; after gaining the authorization, adding corresponding encrypted codes on the e-mail based on a selected safety level; and sending the encrypted e-mail over an authorized VPN.

Abstract: The present invention is to provide a method of receiving an e-mail at a mail server and sending a converted one therefrom comprising the steps of providing a conversion module in the mail server; and in response to a connection of a portable terminal to the mail server for receiving a compatible e-mail, enabling the mail server to activate the conversion module for converting the e-mail having a complex form unreadable by the portable terminal into a new e-mail having a simple form readable by the portable terminal; and sending the new e-mail to the portable terminal.

Abstract: A method for transmitting a copyrighted electronic document in a wireless communication system is disclosed. The wireless communication system has an electronic document management server and at least a base station, where the wireless communication system can utilize the base station to wirelessly transmit data to at least a mobile phone. The method includes a registration procedure for providing certification information to the mobile phone and a downloading procedure for transmitting an encrypted document to the mobile phone so that the mobile phone can use the certification information to decrypt the encrypted document into the electronic document.