Well one reason I didn't use watermarked pictures is because the watermark is annoying lol. But that copyright issue makes me think twice. It's difficult though to judge what pictures are copyrighted or not, especially if they're not watermarked. I mean if I look for a lion image and get a ton of results on google, I'm not going to seek all its history to find out if I can use it or not! It would be an endless loop.