ed - A good measure really... :)
Phosphor writes "A visitor to the Adobe Photoshop-for-Windows Forum (registration required to post, can log in as guest) has described a curious "feature" with Photoshop 8 (also known as "CS"). Seems this latest version of Adobe"s flagship product has the built-in ability to detect that an image is of American currency. Something has been built into Photoshop"s core coding that can detect something in images of currency and will prevent the user from opening the file. Apparently it will also do this with Euro notes; info on other currency is pending." According to other online reports, the latest version of Paint Shop Pro has similar restrictions, also known about since late last year.
ed- For more information on a very interesting subject, read through the comments.