You don't have to do anything in order to copyright for free. The minute you write or invent something it is protected under the US Copyright law. Regardless of this you may wish to register and obtain all the benefits of registered copyrights.

To copyright for free, can be risky. Some sites and companies say that they can copyright for free. These same companies have been known to steal ideas. It is most important to only trust the U.S. Copyright Office. You can find more information here: www.copyright.gov...