Clay

So I joined one of those clubs that sends out free pics and asked the owner if I could use these pix on my website and he said to go ahead because it's public domain content.

So is this the green light to use this stuff or should I stay away? I mean if theres a problem and apix comes along I'll get a warning before they do anything, right? If there ever was a complaint I would remove it right away anyways, I just don't want to be the guy that other people say "he was an idiot for using that and got what he deserves".