technical surveillance countermeasures
tehniline jälgimistõrje
olemus
jälgimistõrje tehnilised meetodid ja vahendid
ülevaateid
https://en.wikipedia.org/wiki/Countersurveillance
https://www.securitydegreehub.com/technical-surveillance-countermeasures/
http://www.msasecurity.net/msa-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