Intrusion Detection Systems (IDS) - (Associated with Network-based Intrusion-detection System, NIDS, Passive System, Reactive System, Protocol-based Intrusion Detection System, Application Protocol-based Intrusion Detection System, Host-based Intrusion Detection System, Hybrid Intrusion Detection System, Hybrid IDS, Snort, Prelude, Intrusion Prevention System, IPS, Anomaly-based Intrusion Detection System, Artificial Immune System, Autonomous Agents for Intrusion Detection, Intrusion Detection Systems category at Open Directory Project, Spyware Blocker.) -