A method of providing access control for and/or vis-à-vis users who access a computer network enabling exchange of information, in particular the Internet, by means of terminals, via a private access node, shared or specific to an organization, such as a company, to which said terminals are connected to access said computer network via an access server, which method stores temporarily for downstream filtering the stream of multimedia data received from said computer network addressed to a user terminal in response to an access request formulated from said terminal, said downstream filtering being applied by an arrangement for authorizing or blocking transmission of said data stream to said terminal as a function of particular criteria applied to the received data stream at said private access node.