ISBNs, Barcodes & Copyright Pages: The Legal Setup Every Self-Publisher Needs
The legal setup for a self-published book comes down to three pieces. An ISBN is the 13-digit identifier that lets the book supply chain track your title — you can use a free one from KDP or buy your own from Bowker ($125 for one, $295 for ten, ~$575 for a hundred in the US), and each format (paperback, hardcover, ebook, audiobook) needs its own. The free KDP ISBN works but lists the platform as publisher of record, which limits selling that edition elsewhere. The barcode is the scannable version of your ISBN — KDP and IngramSpark generate it automatically, so most authors never buy one. The copyright page carries your copyright notice, ISBN, edition and disclaimers. Here's how to handle all three.
ISBNs, barcodes and copyright pages are the unglamorous legal plumbing of publishing — easy to get slightly wrong, and awkward to fix after a few hundred copies have sold. Here's what each one is, whether you need it, and how to set it up correctly.
Do you need an ISBN?
An ISBN (International Standard Book Number) is a 13-digit identifier that tells bookstores, libraries and distributors exactly which version of which book you mean. Without one, a print book is largely invisible to the traditional supply chain. Whether you need to buy one depends on where you sell:
- Amazon-only, using KDP: you can take KDP's free assigned ISBN and never buy one.
- Wide distribution / your own imprint: buy your own so you control the identifier and appear as the publisher.
- Ebooks on KDP: don't even require an ISBN — Amazon assigns an internal ASIN.
Free KDP ISBN vs. buying your own
This is the real decision. The free option is genuinely fine for some authors, but it has a catch:
| Free KDP ISBN | Your own (Bowker) | |
|---|---|---|
| Cost | Free | $125 (1), $295 (10), ~$575 (100) |
| Publisher of record | Amazon/KDP | You / your imprint |
| Sell same edition elsewhere | Limited | Full control |
| Best for | One book, Amazon-only | Wide distribution, multiple titles, a real imprint |
In the US, ISBNs come from Bowker (via MyIdentifiers) and nowhere else. Buying in bulk drops the per-unit cost dramatically — a 10-pack works out under $30 each — so if you'll publish more than a book or two, or want your own imprint name on the record, buying is usually worth it.
Each format needs its own ISBN
A single ISBN identifies one format of one edition. So the same book across formats needs separate numbers:
- Paperback — one ISBN.
- Hardcover — a different ISBN.
- Ebook — its own ISBN (though KDP ebooks can use an ASIN instead).
- Audiobook — another ISBN again.
Assign ISBNs only once the book is finalized — the number is tied to the edition as submitted. Minor fixes (typos, a new cover, an updated bio) don't need a new ISBN, but a substantially revised second edition does.
Barcodes: you probably don't need to buy one
The barcode is just the scannable, printed representation of your ISBN (plus optional price). Here's the part that saves authors money: KDP and IngramSpark generate the barcode automatically when you upload — whether you use a free or purchased ISBN. Most print-ready cover templates leave a space (around 2″×1.2″, usually bottom-right) that the platform fills. You only need to buy or generate a barcode separately if you're printing outside those platforms; free generators exist for that case.
What goes on the copyright page
The copyright page sits at the front of the book (right after the title page) and carries the legal essentials. A standard one includes:
- Copyright notice — ©, year, and author/rights-holder name.
- ISBN(s) for the edition (and often a note of the format).
- Edition and printing information.
- Publisher / imprint name and contact or website.
- A rights-reserved statement and any disclaimers (e.g. fiction disclaimer).
- Credits — cover designer, editor, illustrator, as appropriate.
An optional extra: a Library of Congress Control Number (LCCN) is a free identifier used mainly by US libraries — not required for most self-publishers but worth adding if libraries are a target. Registering your copyright with the US Copyright Office is also separate from (and not required for) getting an ISBN; the two processes are independent.