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[ChickenFreak]

Another comment - the design of "useful objects" or "useful articles" can't be copyrighted in the United States. This is a messy thicket and I'm not a lawyer, but i think that it means that your photo of your headphones would be fine - they're a useful object, their design is inseparable from the object, and you took the photograph. (I think?)

But your photo of the T-shirt with the image on it would not necessarily be fine - the T-shirt is a useful object, but the image could be separated from the shirt and copyrighted. (Plus, I think that you didn't take that photo(?), so the photo itself would be copyrightable.)

Messy thicket. But it might be worth Googling, to reassure yourself about the legality of some things.