Three such systems are Libsafe, and the "StackGuard" and "ProPolice" gcc patches.

Entity and relation annotations:
id: 0
type: entity
value: text: Libsafe
labels: <Production>
id: 1
type: entity
value: text: the "StackGuard"
labels: <Production>
id: 2
type: entity
value: text: "ProPolice"
labels: <Production>