Us copyright law books

Do I need to copyright my book in the USA?
Do I need to copyright my book? From the moment your words are written on paper or saved to a digital file, your work becomes protected under intellectual property law.
It doesn't require any formal registration..
How long are books copyrighted in USA?
Generally, copyright protection lasts for the length of the author's life plus another 70 years.
In the case of joint works, copyright protection lasts for the length of the life of the last surviving joint author plus another 70 years..
What is the copyright information on a book?
A copyright page is for letting people know a book isn't in the public domain.
It's your copyrighted intellectual property.
Your book cannot be copied without permission.
This page also contains info helpful for distributors, librarians, retailers, and booksellers..
A public domain work is a creative or intellectual work that copyright law does not protect.
These works of authorship, be they music, plays, books, poetry, or art, may be used freely by anyone once they enter the public domain.

Do I need to copyright my book in the USA?