Copyright protects the specific expression of your ideas, your actual words, sentences, and arrangement of the story or argument, but it does not protect the underlying ideas, facts, titles, or general concepts themselves, and confusing these two categories is one of the most common misunderstandings authors have about their own rights. Someone can write a book with a very similar premise to yours without infringing your copyright at all, as long as they didn't copy your actual expression of it.
This article provides general information, not legal advice.
This is part of the Complete Guide to Copyright for Authors.
Copyright exists automatically from the moment you create an original work in fixed form, meaning written down, saved, or otherwise recorded in some tangible way. You don't need to register it, publish it, add a copyright notice, or do anything else for the protection to exist. This surprises many authors, who assume copyright only "kicks in" once they register or publish.
For works created by an individual author, U.S. copyright generally lasts for the author's lifetime plus 70 years. For works made for hire, the term is generally 95 years from publication or 120 years from creation, whichever is shorter. This matters for estate planning purposes and for understanding when older works enter the public domain and become free to use without permission.
If you collaborate with a co-author, ghostwriter, or other contributor, ownership can get more complicated than a single author's copyright. Work created as a "work made for hire" (common when you commission illustration, narration, or translation under a proper agreement) generally means the commissioning party, you, owns the copyright outright, rather than the person who did the work. This is part of why clear, written agreements matter for any collaborative or commissioned work. See Working with an Illustrator for Your Children's Book for how this applies to one specific kind of commissioned work.
Since copyright is automatic, you don't need a copyright notice, the little © symbol with a year and your name, for your work to be protected. Including one is still a reasonable practice, since it signals to others that you're aware of and asserting your rights, and it can be relevant in some legal contexts, but its absence doesn't mean your work is unprotected, and its presence doesn't add legal protection beyond what already exists automatically.
Understanding what copyright actually covers helps you in two directions: it clarifies what you can safely draw from (ideas, facts, general structures, and older public domain works) when researching or drawing inspiration for your own book, and it clarifies what's actually at risk if someone copies your work closely (your specific text and expression) versus what isn't infringement even if it feels unfair (someone writing a similar premise in their own words).
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No. Copyright protects your specific expression, the actual text and how you told the story, not the underlying idea, concept, or premise, which someone else could write about independently without infringing.
No. Copyright exists automatically from the moment you create the work in fixed, written form. Registration adds specific legal advantages but isn't what creates the protection itself.
For an individual author, generally the author's lifetime plus 70 years. Works made for hire generally last 95 years from publication or 120 years from creation, whichever is shorter.
Often, yes, if they wrote their own original text and didn't copy your specific expression, characters as you developed them, or sequence of events. General plot structures and premises aren't protectable on their own.