A security system includes a base station that reads a first tag and a second tag, each tag associated with items, persons, and/or containers. Upon reading the tags, the base station determines whether the removal of the items, persons, and/or containers is authorized. If the removal is not authorized,...http://www.google.de/patents/US5886634?utm_source=gb-gplus-sharePatent US5886634 - Item removal system and method
