olemus
jälgimistõrje tehnilised meetodid ja vahendid
= technical methods and devices of countersurveillance

ülevaateid
https://en.wikipedia.org/wiki/Countersurveillance

https://www.securitydegreehub.com/technical-surveillance-countermeasures/

https://www.energy.gov/sites/prod/files/2016/04/f30/Chapter_9_Technical_Surveillance_Countermeasures.pdf

https://archive.org/stream/pdfy-XRWV9-1hWbk1Wzsq/DoD%20Technical%20Surveillance%20Countermeasures_djvu.txt

vt ka
- kuuldetõrje