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Richard M. Smith observes that several products known to detect images of currency refer users to http://www.rulesforuse.org, a site that explains various countries’ laws about use of currency images. It seems a good bet that any software containing that URL has some kind of currency detection feature.

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.

Richard reports finding the string in drivers for the following printers: HP 130, HP 230, HP 7150, HP 7345, HP 7350, and HP 7550.

Go ahead, try it yourself. If you find anything, post a comment here with the details.