Abstract: A door security system serves to substantially improve the reliability of the entire door assemblies with non-standard door jamb thicknesses. The system may comprise up to four or more components. An adjustable door jamb shield may be mounted around a door jamb on the side of the door jamb corresponding to the door slab free swinging edge. Another adjustable door jamb shield may also be mounted on a door jamb 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.