the present invention is a security system for preventing theft of hanging merchandise . the present invention includes a security package system for a product to be placed on a hanging display , the package comprising : a product package of a relatively thin plastic material and having a top portion which has a front and rear , the top portion having an aperture adapted to receive a hang support ; a locking member of a relatively thick plastic material and having a front and rear portion so as to removeably fit over the top portion of the product package and having apertures in the front and rear portions that are positioned so as to align with the aperture of the top portion when in position over the top portion .