I think this isn't so much about the search engine proper as well as Google's image server which indeed downloads images from all over the web and later returns those when queried about images for a given subject.
These aren't usually (at least when I last used it) fitted with a reference to the original source of the image, which is highly questionable behaviour on the part of Google (and Yahoo and others who have similar services).
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duckman
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since Nov 2004