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Surveillance and counter surveillance - YouTube
One of the most valuable tools in our TSCM (Technical Surveillance Counter Measures) threat detection arsenal - HackHunter
Citizen Counter-Surveillance of the Police? There's an App For That. | Digital Media Law Project
Security First - Umbrella: A free, simple security app for NGOs
Importance of Counter Surveillance in Today's Digital World
TSCM Measures - Siepel
A Paranoid Guide to Fighting the 'Bugging Epidemic' - The New York Times
Effective Counter Surveillance Measures To Prevent Leaks
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Android app Umbrella trains users in digital and physical security
Umbrella Secure App To Manage Digital And Physical Security - Hackers Online Club (HOC)