As I understand it, you can't use a non-nude image that is cropped from an image that originally featured nudity without maintaining the proper docs. So if the images you use are not from a set that features nudity, but links to an entirely different set hosted by someone else, then I wouldn't think you'd need docs. I'm not 100% certain, though.
Let us know the results of your legal counseling, although I'm pretty sure different lawyers are telling people different things because it's so vague.
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