I just realized that there is a watermark of "Disneyland" logo on the back of my annual Pass. It is next to where it displays my name.
You can't really see it until you look very hard.
The reason why I know about the watermark is because when I was riding any Dark Ride at Disneyland. whenever I pass under the blacklight, the "Disneyland" logo magically appears in the middle of my annual pass. it looks really neat and awesome too.