tambo, you couldn't be more wrong about the images on the web being free to use if they don't have a copyright symbol.
///Copyright is an automatic right and does not require the author to file special paperwork, as is the case for trademark and patent. Registration is required to enforce the rights, but as a matter of right, an author is not required to register anything to get the right to use the “circle c,” showing the work is copyrighted.///
///Copyright attaches as soon as the original work is created, and applies to both published and unpublished works. As soon as you type words, click the shutter on your camera (or, for many of you, hit the home button on your iPhone), apply paint to canvas or paper or lay down tracks for your next hit, you’ve got a copyright (with some exceptions).///
http://www.socialmediaexaminer.com/copyright-fair-use-and-how-it-works-for-online-images/