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ccDan - 12:45 am on Jul 3, 2007 (gmt 0)
I'm not sure if that's the case, at least with regard to the designs for the state quarters. I researched this when the quarters were first coming out, and I thought I had read that those particular images were copyrighted. I don't remember the source, so don't know now how reliable that info was.
In our one instance it involved reproducing tables of statistics, and lists. If I recall correctly even images of US postage stamps and coins issued (as long as they clearly aren't intended to defraud, as in counterfeiting) by a goverment are non-copyrighted, as the art was bought and paid for with public funds, although I understand this is NOT the case in every country