Purple flowers against rocks.
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Dr. Thomas G.; Barnes, U.S. Fish and Wildlife Service
Public Domain — Free of Copyright Limitations
Most public domain photos were created by U.S. Government employees as part of their official duty. These photos are not copyrighted, so they may generally be used freely without restriction provided there are not underlying legal rights that may limit your use of a photo. Privacy rights and trademark laws are just two examples of such possible limitations. Read this tutorial for more information. Remember, that it is still courteous to give credit to the photographer and publisher.