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The perimeter domain can be seen as the walls of a castle. These technologies are meant to keep information in and attackers out.

Anti-immigrant sentiments elevate security need at Mass. shelters

A water filled barrier wall ensures unbreachable safety

Security Archives - Orange Matter

A Guide to Firestopping: Getting It Right for the Future

New fence at Friendship Park counter to California values - CalMatters

Implementing Physical Protection Systems – A Practical Field Guide, 3rd edition

Celebrity Protection in the Spotlight

New EHT observations of M87 reveal persistent black hole shadow

Perimeter Security - an overview