Parmigiano-Reggiano makers are putting edible microchips the size of a grain of sand into their 90-pound cheese wheels to combat counterfeiters::Italian Parmigiano-Reggiano makers are using microchips to verify the authenticity of their products and thwart scammers.
as other people pointed out, is a sticker on the outside, on the hard part.
unless you are very hungry and have good teeth, you will not eat it.
yet, since is applied on edible product, it needs to be edible.