a flexible one-piece substrate having a top edge, a bottom edge, and two generally parallel side edges arranged relative to each other to provide said substrate with a generally rectangularly shaped outer edge configuration, with said substrate further having first and second generally parallel and planar surfaces, and with a multicolor advertising copy being printed across all or substantially the entirety of at least one of said planar surfaces with solvent inks thereby yielding protection to said substrate against exposure to atmospheric elements so as to prolong the usefulness of the sign during use, with two opposed edges of said substrate being operably secured to each other so as to form an elongated and replacable sleeve-like advertisement with a pair of axially aligned open ends and which is configured to extend over and cover more than 60% of the length of each side of said free standing security system, with said sleeve being sized to fit along and about the length of said free standing security system such that the advertising copy on said sleeve-like advertisement, after being arranged about said security systems, permits said security system to present an upstanding point-of-purchase advertising medium on both sides of said security system whereby yielding a minimum of two visual advertising impressions to every person passing the security system.