It's a really slippery slope when it comes to copyrights/ownership online with works
what? no it isn't. the article you linked to doesn't even have anything to do with the photos originally being posted on the internet. it's about fair use, and the fact that this "artist" edited them before selling them. I really can't see any court finding what he did legal, but I guess that's not the point
where they were posted doesn't change anything about them whatsoever
So if you haven't copyrighted it
if you live in
any of these countries with a date under the "Berne" column, it's copyrighted as soon as you make it
it isn't illegal to download it and sell it claiming it as your own work?
whether you pretend you made it or not doesn't matter, it's still illegal. but that website is weird. the only way to know for sure what a court would decide is for that to actually happen (it won't)