e/Countersurveillance

Information
has gloss	eng: Countersurveillance refers to measures undertaken to prevent surveillance, including covert surveillance. Countersurveillance may include electronic methods such as bug sweeping, the process of detecting surveillance devices, including covert listening devices and visual surveillance devices. More often than not, countersurveillance will employ a set of actions (countermeasures) that, when followed, reduce the risk of surveillance.
lexicalization	eng: Counter surveillance
lexicalization	eng: Counter-surveillance
lexicalization	eng: countersurveillance
instance of	c/Espionage techniques