I was unpleasantly surprised today when I found out that one of my work was removed due to copyright issues. I was using only stock images for it. So, I went through all used stock and then I found out that one of the stock account was deleted. I don't know what happened to it. I'm assuming that maybe he didn't put his own images for stock use. Which sucks. Because I was working for days on it.
So, even if you are using images that are meant to be used as stock, there is a big chance you're violating something. Because there are poor minded people out there.