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Public Domain Books Explained
What copyright expiry actually does, why it is territorial, why a public domain book can still be sold, and what it does not mean for translations, editions and audio.
Evergreen No expiry
Public domain is one of the most frequently misunderstood terms in books, and the misunderstanding is what makes piracy feel necessary. It is a specific legal category with a specific consequence: the exclusive rights in a work have expired, and the work now belongs to no one in particular.
What expiry does
Copyright is a bundle of rights, not a single permission. It covers reproduction, distribution, adaptation, performance and display. When copyright expires, all of them lapse at once. Anyone may then copy the work, translate it, adapt it, sell it and perform it, without permission or payment.
Why it is territorial
Copyright is granted and expires under national law, and countries set different terms. The United States has used several different systems, each with its own rules depending on when a work was created and whether it was published. Other countries use life-plus-N, where N is typically 70. The same book can be public domain in New York and still in copyright in Sydney. This is why international distributors and Project Gutenberg both attach territorial conditions to some titles rather than treating the whole shelf as uniformly free.
Public domain does not mean worthless
Plutarch, Jane Austen and the Greek dramatists are all public domain. Public domain means the copyright has expired; it says nothing about quality, demand or commercial value. Several public-domain titles are among the best-selling books in the English language, because the readers never stopped wanting them.
What does not become free
Copyright attaches to the specific expression. When a classic text enters the public domain, these generally do not become free with it:
- A new translation. The original author's words may be public domain; a translator's rendering is a separate copyrighted work.
- A new edition's editorial matter. A modern introduction, footnotes and apparatus are somebody's new writing.
- Cover art and illustration. Usually protected independently of the text.
- Recorded audio. A public-domain audiobook is a new performance and a new recording.
This is the detail that trips people up, and it is why you can legally download the 1813 edition of a novel and still be within your rights while an audiobook of the same novel is not.
The practical test
When a site calls a book public domain, ask which edition is public domain, in which territory, and on whose authority. A source that answers all three is telling you something true. One that does not is telling you what it hopes you will not check.