The vector stencils library "Access and security" contains 17 clipart images of access control and security system equipment which you can easy use in your diagrams and illustrations.
"Physical security describes security measures that are designed to deny unauthorized access to facilities, equipment and resources, and to protect personnel and property from damage or harm (such as espionage, theft, or terrorist attacks). Physical security involves the use of multiple layers of interdependent systems which include CCTV surveillance, security guards, protective barriers, locks, access control protocols, and many other techniques." [Physical security. Wikipedia]
The clip art example "Access and security - Vector stencils library" was created in the ConceptDraw PRO diagramming and vector drawing software using the Presentation Clipart solution from the Illustration area of ConceptDraw Solution Park.