Professor Ed Felten suggests you take a look and see if other software besides PhotoShop has built-in safeguards against currency duplication.
So you can look for currency-detecting software on your own computer. Just search the contents of your computer for the character string “http://www.rulesforuse.org”, and see if you find that string in any software such as an application or a printer driver.
I didn’t find anywhere on my system: update this page’s comments if you find anything.
[Posted with ecto]