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Other works in the public domain -- those you are free to use without having to worry about copyright -- include those created by the U.S. Government. So, for instance, you don't need permission to use screen captures of government Web sites as examples of good or bad design in a class on designing Web pages. But don't assume this applies to foreign countries as well. The government of the United Kingdom, for instance, does claim copyright for its works. So travel with care when reusing governmental works found on the Internet or elsewhere.