This invention relates to a security apparatus for trade show booths comprising a flexible cover section to enclose an opening in a booth structure and a means for securely fastening the edges of the cover section to an opening of a booth structure so as to provide a securable removable cover to deter individuals from stealing merchandise from a display booth or otherwise enclose the booth for privacy. In one embodiment, adjustable fasteners that are used to secure the vertical edges of the cover are provide in manner that does not permit removal from outside of the cover when installed. Optional hangers are also used to hang the top edge of the cover to a support structure. Additionally, the cover may be provided with an adjustment belt to ensure that the cover remains taut on the support structure when locked in its fastened position.