A method and system for transmitting information over a communication network comprising a user device and a server, wherein the user device receives the information from or via this server. The method comprises the step of triggering an interactive session between the server and the user device depending on at least one property of the requested information and evaluating the result of the interactive session. On the basis of the result of the interactive session, it is determined whether and/or in what form the requested information is transmitted to the user device.