Here we present a research project to create and deploy an Intrusion Detection System based on Autonomous Mobile Software Agents. An Intrusion Detection System is an administration/management tool that identifies and reacts to intrusion and unauthorized use attempts. These agents will use mobility facilities, allowing an efficient use of resources, by dynamically distributing processing tasks, with a minimal degradation of the performance perceived by users. With this kind of system, it’s easy to setup an efficient defense for environments such as Multimedia Systems, where there’s no much experience about potential security hazards.