This patented technique adds an unparalleled level of PIN security. Using SSL, the PIN is sandwiched between two layers. This prevents the label from being peeled off to expose the PIN beneath.
Any illegal peeling will result only in seeing the dark underside of the fragile bottom layer, where the PIN is printed on the other side and sandwiched in between. The PIN MUST be scratched from the front side and seen through the plastic film.
Sandwiched Scratch Layer (SSL)