Jakke PNG

What does the law say about taking pics of say, a coke bottle and then to sell it? I mean, not the coke bottle somewhere in the background, but it being the main focus. Or a camera picture on a webdesign, if I take a picture of my own camera (with another camera dumbass), and place it into a design of a tour where the 'logo' is visible or it's clear what camera it is etc etc.

Basically making money of pictures of another companys product.
'stock art' kinda way.

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..and I'm off.