Security measure is a term used to describe the various methods used to protect people, property, and information. One security measure is a LIEN, which is a legal claim on a property that can be used to secure a debt or other obligation. Another security measure is frisking, which is a search of a person's outer clothing for weapons or contraband. Finally, an X-ray is a type of security measure that uses electromagnetic radiation to create images of the inside of an object or person.