Adobe PhotoShop spies for counterfeiters

Pop up warning from Adobe PhotoShop CS2 v.9.0 on loading a photograph of a US $20 banknote.

Check out the pop-up love note I got from Adobe PhotoShop CS2, version 9.0, when I opened a photograph, taken on my digital camera, showing a real $20 banknote lying next to 6 same-sized blank sheets of white paper. While this image was open, I also could not adjust the resolution of the image [...]