A buckle assembly comprising a plug portion and a socket portion. The plug portion has a base, a pair of parallel side arms attached to and extending away from the base, the side arms being flexible toward each other, and a center arm disposed between the side arms and connected to the base as well....http://www.google.es/patents/US6311374?utm_source=gb-gplus-sharePatente US6311374 - High security buckle assembly
