Copyright is automatic!
Copyright protection in the U.S. exists automatically from the moment an original work of authorship is fixed in a tangible medium. Registration of copyright with the U.S. Copyright Office is voluntary. There are cases in which registration is recommended, but it is never required.
In order to be copyrightable, a work must be:
What is protected?
What is not protected:
For works published in 1978 and later, copyright lasts for the life of the author plus 70 years. The copyright term for corporations (works for hire) is 120 years from creation or 95 years from publication, whichever is later.