Definition(s)
Layers of Protection
concentric “rings of protection”
A concept of providing multiple independent and overlapping layers of protection in depth. For security purposes, this may include various layers of protection such as counter surveillance, counterintelligence, physical security, and cyber security. A second consideration is the balance of the security measures such that equivalent risk exists regardless of the threat’s pathway or method.
Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards
Layers of Protection
A concept whereby several independent devices, systems, or actions are provided to reduce the likelihood and severity of an undesirable event.
Source:API STANDARD 780, Security Risk Assessment Methodology for the Petroleum and Petrochemical Industries, First Edition, May 2013. Global Standards