Multilayer film and authentication label

An authentication label for attachment to a substrate comprising:

• a multilayer film comprising:
• a frangible holographic image layer;
• an adhesive layer adjacent to one side of the holographic image layer;
• wherein a side of the adhesive layer that is opposite the holographic image layer contacts the substrate and adheres the label to the substrate;
• and
• an additional layer that provides mechanical integrity to the multilayer film, wherein the additional layer comprises a heat-shiinkable film as a temporary support that is adjacent a side of the holographic image layer that is opposite the adhesive layer and is removable from the multilayer film with heat after application of the multilayer film to the substrate,
• wherein the multilayer film does not include a permanent protective layer on or above the holographic image layer opposite the adhesive layer, so that the holographic image layer forms an exterior surface of the label;
• the adhesive layer is not heat-activated, and comprises a pressure-sensitive adhesive selected from acrylic resins, rubber-based resins, silicone resins, or any combination thereof;
• and
• the substrate is selected from a product, a package, a component, or a label stock.