Abstract: The looped free ends of venetian or vertical blinds are typically housed in somewhat complicated control or security structures. A simple security device for limiting access to the looped ends of blind cords includes an elongated, rectangular housing for mounting at one end of a blind assembly, at least one counterweight slidably mounted in the housing for vertical movement therein, and a recess in the counterweight for receiving the looped bottom end of a blind cord, so that the end of the cord remains in the housing.