As far as I've researched, this is what's known as Registered. You own the copyright automatically, but once you've registered your photos, with the US Copyright Office-Registration of Published or Unpublished Photos, you can sue for damages. In some cases, you can sue for damages without the need to have the photograph Registered, though it's much easier with a Registered Photo. Also, the photo does not need to have been published to be Registered, though there are different steps to registering published and unpublished photos. I've registered about 1% of my photos...lol.
U.S. Copyright Office - Registration of Published Photographs
[URL]http://www.peterkrogh.com/copyright/main.html
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Thanks for the links sid good information. It has been awhile since I had taken my photography classes and copyrighting photos had been discussed.