Abstract: A shelf tag moulding attachment assembly is provided for securing a product information module to a standard shelf tag moulding in a manner as to inhibit unauthorized removal, while permitting easy removal by authorized personnel through use of a grasping device. The assembly preferably includes a mounting member having projections disposed at one end for effecting biting engagement with one of the tag moulding lips, and a lever arm rotatably coupled to the mounting member having a cam at one end disposed to controllably engage the other lip of the tag moulding. The assembly is demountably secured to the tag moulding when the lever arm is rotated with respect to the mounting member.