See also #secure.
Definitions:
Intrusion prevention is the process of performing intrusion detection and attempting to stop detected possible incidents.
Quality of a software application that it is monitored by an intrusion detection system that is also able to actively prevent or block intrusions that are detected.
Derived from Wikipedia/Intrusion Detection System
Quality of a software application that it is monitored by another system that identifies any suspicious activity and either detects and allows the activity or prevents the threat.
Derived from Checkpoint/Intrusion Prevention System