Well there are tools if you want to be absolutely sure a photo hasn't been just copied from another source: You can do a reverse image search with Tineye or even Google by just pasting the url (of the picture) in the search box.
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Exactly. I've been using Tineye since it came out. Getty was using the professional version and had recommended Tineye to its contribuors. I intend to write about that at some point, but am just giving snippets of information at a time, because there is a lot to digest! As you probably know, you have to b careful how you use it, and not assume things.
I don't need to worry as I shoot my own photos. I also share them gratis for attribution using the Creative Commons. I also strongly advocate that, having been introduced to the idea of 1000 true fans via Cory Doctorow.