In the United States, once you publish your "original work of authorship fixed in a tangible medium of expression," it is copyright eligible. See 17 U.S.C. § 102 (a). You do not need to register in the United States to claim copyright ownership. However, copyright registration gives extra protection and additionally legal rights in the form of statutory damages in federal court litigation.
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Answered on Dec 14th, 2019 at 5:47 PM