The term door security may refer to any of a range of measures used to strengthen doors … Door chains — allows the doors to be opened slightly to view outside while still remaining locked. Secondary, internal locks — sliding bolts, hooks and speciality latches, metal blocks or bars mounted internally. Hinge screws
Physical security describes security measures that are designed to deny unauthorized access … Apart from external threats, there are internal threats of fire, smoke migration as well as sabotage. … Doors, gates, and other entrances, in particular, should be well lit to allow close observation of people entering and exiting.