A few weeks ago I bought a premade website. With that came a few images. After a little research I found out some of those pictures are also to be found on iStockPhoto. I emailed the seller and he said "My designer only uses copyrightfree images, so I assume the images are 100% copyright free." What should I do? The picture was uploaded in may 2007. Is there any way I can find out if it is really copyrightfree? What if I get sued after a while, is the websiteseller responsible? Thanks in advance.