Not true. Intellectual property, at least in the U.S., is protected from the moment it is created and does NOT need a copyright notice or any other explanation of rights.
The following information from Wikipedia summarizes current copyright law in the U.S.:
While copyright in the United States automatically attaches upon the creation of an original work of authorship, registration with the Copyright Office puts a copyright holder in a better position if litigation arises over the copyright.
As the United States has joined the Berne Convention, registration is no longer necessary to provide copyright protection.
In 1989, the U.S. enacted the Berne Convention Implementation Act, amending the 1976 Copyright Act to conform to most of the provisions of the Berne Convention. As a result, the use of copyright notices has become optional to claim copyright, because the Berne Convention makes copyright automatic.[20] However, the lack of notice of copyright using these marks may have consequences in terms of reduced damages in an infringement lawsuit ? using notices of this form may reduce the likelihood of a defense of "innocent infringement" being successful.
Whether you agree or not, copyright infringement is a criminal act. If you'd like to bring a defamation suit, be my guest. You're just plain wrong.