Well, copy wright laws, and fair use laws are
very convoluted and vague. Basically, from how I read it, you can copy the picture/work for "educational" value and be fine. Educational being of questionable definition interpretation as that is not defined. If I'm just copying someones pics to do my own research (such as me copying a lot of black and white mining pictures) and storing them online for my use and use of others, with no attempt to make gain from them, then there is no infringement.
However, if the owner of the property, either intellectually or physically requests me to remove that material from being openly accessible, then I'd have an obligation to do so. But, under no
legal direction to do so. The law vaguely says that if there is a dispute as such, then seeking legal advice is the path to take. Nothing clear cut and dry.
I guess from Larry's OP that I'm not clear as to what he really found. If he just found his pics on someone else's profile then again I'd be adamant in stating that the other guy/girl is utilizing the fair act accordingly. But, if the other person were selling the property, claiming it was theirs, etc, that would indicate a copy wright infringement.
One thing to note though, if you take the time to read the links below, is no where does it specifically state that credit is or has to be given to the original owner of the property. Unless the copy wright mark is considered the "credit given" and implied as a requirement when reproducing property. Even then, "giving credit" isn't discussed.
As to the OP and the title used on the thread, Larry is implying that his pics were stolen. They weren't. He still has the originals and the original digital copy correct? To be stolen from him he'd have to be without them now and in the possession of the other people. They just just have copys. They weren't stolen, just borrowed/copied.
Copywrite law of the USA: Owners rights of copywrite work (section 106 and 106a)
Copywrite law of the USA: Limits on exlusive rights: Fair Use
Fair Use
Maybe someone can read legalese better than me, or wants to read the other sub sections to dissect the entire "law" as I just tried to focus on what seems to apply here and may have missed something entirely.