Everyone knows that photos and pictures made by someone else are copyrighted automatically. This means that no-one can just use these works, photos or images for their own purposes. This is also the case for images on the internet, contrary to common held believes by some.
However, if the maker of the photo or image wants to, he or she can release the work into the public domain. By stating that an image is free to use in the public domain, the maker basically gives up some or all of his copyrights.
The FreedomImage.blogspot.com website is gathering the sources of copyright-free images and photos on the web, so you can use them in any way you like, even commercially.