Pollution   

What Are Public Domain Photos?

Public domain images are completely free, copyright-free, and royalty-free. Public domain photos have fewer limitations than most stock photos, stock images, and stock photography. Because there is no copyright on these photos and images, you can use most of them for commercial purpose with few limitations. But that there may still be limitations based on publicity or privacy or trademark laws. And remember that it is still courteous to give credit to the photographer or illustrator.