Patent ID: 7193995

Claim:
A method of controlling, at a server, access right of a message received from a terminal at the server, and where the message is processed by a protocol stack, and where the message is a data packet comprising: a sender address specifying the address of the terminal, a port number specifying the application address of the instance sending the message at the terminal, and user data including the contents of the message, and the method comprising: checking the right of the message to enter the server before the message is allowed to pass to the protocol stack establishing a session between the server and the terminal and for receiving the data packet within the session, and the checking of the right of the message to enter the server comprises: storing a number of access right licenses purchased by a licensee, and reserving a license of the licensee if the data packet arrived in a new concurrent session relating to the licensee, controlling that the number of reserved licenses does not exceed the number of purchased access right licenses, reserving a license for the session as a response to having determined existence of access right, and monitoring the time passed since the last data packet arrived in one session, and releasing the license for the session where a predetermined time has passed since the last data packet arrived in the session.