Abstract: A releasably securable security apparatus for securing the tailgate and rear canopy window of a pick-up vehicle equipped with a canopy, provides a releasably securable securing frame and a mounting means capable of being attached and secured to the side walls of the cargo box of the pick-up vehicle. The securing frame is mountable onto the pick-up vehicle, such that when in a closed position, the securing frame is positioned generally astride a tailgate and rear canopy window of the pick-up vehicle, and when secured in such closed position, prevents the tailgate and/or rear canopy window from being opened, and when in an open position, allows the tailgate and/or the rear canopy window to be opened so as to allow loading and unloading. The securing frame may be one-piece or two-piece. The two-piece securing frame comprises two gates, each for mounting on an opposite side of the rear of the pick-up and gates lockable to each other in the closed position.