a door security system serves to substantially improve the reliability of the entire door assemblies with non - standard doorjamb thicknesses . the system may comprise up to four or more components . an adjustable doorjamb shield may be mounted around a doorjamb on the side of the doorjamb corresponding to the door slab free swinging edge . another adjustable doorjamb shield may also be mounted on a doorjamb on the hinge side of the door jamb . the adjustable shields comprise attachable sleeves that wrap on three sides around the door jamb to reinforce and stabilize the door system .