If something is in the public domain, it is unencumbered by any copyright whatsoever and can therefore be used in any publication or used commercially without getting permission from anyone, as there is no one to give permission. I asked for clarification and received boiler-plate text in response:
They seem to be taking the position that you are violating their Terms of Service by downloading image n if your intent is to use it for anything not considered “private use”. This doesn’t sound legal to me. Suppose I browse the images on their website, and I keep a cache of every website I ever visit on my computer (which is true). I now have in my possesion an image which is in the public domain on my computer, which I acquired in a legal manner. As this image is in the public domain I am free to distribute it, sell it, and publish it as I will because it is not encumbered by copyright.
Can someone set me straight. I’ve never studied copyright…i’m just a netizen