http://www.ehow.com/how_6687020_establish-copyright.html
How to Establish a Copyright
You automatically establish a copyright in your original work when you put it in a tangible form. While formal registration with the United States Copyright Office is not required, it does give you important advantages in the event someone uses your work without your authorization.
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Copyrights Are Automatic
- You secure a copyright for your original work of authorship the moment you put it in tangible form. While there is no copyright in an idea or concept, once that idea or concept takes shape in a tangible expression, a copyright is secured for that expression. The copyright law calls it an “original work.” You establish copyright in original works such as literary pieces, musical…
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Chris The Story Reading Ape's Blog 
I would really have no idea if someone was stealing my cartoons and unless I am slandered or libeled or if they make huge amount of money off them there is really nothing I can do despite copyright.
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You could watermark your copyright onto them Carl…
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Now that’s a good idea. I have to learn how to do that. Thanks.
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There are several free and low cost programs available to download for Windows and Mac Computers Carl, but you might want to check if the facility is already available in your current Image Editors. 😀
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