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 using the “Image Size” tool. The original photo, that gave this warning, contained the whole bill. Once I’d cropped it to the photo shown here, saved the image, and opened it again, the warning went away and PhotoShop resumed behaving normally.