Last reviewed by Robert Prime — May 2026
Quick Answer: Copyright is the legal right to control how your creative work is copied (automatic in the UK, free, lasts decades). ISBN is a 13-digit identifier for a specific book edition (£93 single or £174 for ten from Nielsen). Different tools, different jobs. You have copyright by default. You buy an ISBN only if you want retail distribution beyond Amazon's free ASIN system.
Want the full reasoning, examples, and edge cases? Keep reading — TL;DR below for the slightly longer summary, then the full guide.
Table of Contents
- The one-line difference
- Side-by-side comparison
- Do I need an ISBN?
- Do I need to do anything for copyright?
- The Amazon free ISBN trap
- How they interact on your copyright page
- Frequently asked questions
- Final thoughts
The one-line difference
Copyright protects your creative work from being copied. ISBN identifies which book is which in the global retail-and-library system.
They have nothing to do with each other. A book has both. A book can have only one. A book can theoretically have neither (but virtually never does in practice).
Authors mix these up constantly because both are bought-and-paid-for-sounding nouns that show up on the copyright page side by side. They are not the same thing, and one is not a substitute for the other.
Side-by-side comparison
| Copyright | ISBN | |
|---|---|---|
| What it is | Legal right to control how your creative work is copied | A 13-digit identifying number for a specific book edition |
| Who issues it | Nobody — it's automatic on creation | Nielsen Book Services (UK), Bowker (US), other agencies elsewhere |
| What it protects | The text, structure, characters, plot — your creative output | Nothing. It's an inventory tag. |
| Do I need to register? | No (UK). Optional registration for evidence | Yes, you buy one |
| When does it start? | The instant you type the words (or fix them in any tangible form) | When you buy the number and assign it |
| How long does it last? | Your lifetime + 70 years | Forever (but the book version it identifies may go out of print) |
| Cost | £0 (optional voluntary registration: £59.50–£109 (UK Copyright Service)) | £93 for one ISBN; £174 for a block of ten (Nielsen UK pricing 2026) |
| Required to sell on KDP? | Yes, by virtue of being the work's author (auto) | No — Amazon issues a free ASIN as substitute. But the ASIN is NOT an ISBN. |
| Required to sell at other retailers? | Same — automatic | Yes, virtually everywhere outside Amazon needs an ISBN |
| Affects ownership? | Yes — defines who can copy/sell the work | No — the ISBN simply tracks which version is being sold |
If a single point sticks: you have copyright already. You don't have an ISBN until you buy one.
Do I need an ISBN?
It depends entirely on where you want your book sold.
You don't need an ISBN if:
- You're only selling on Amazon KDP and you don't mind Amazon's free ASIN appearing instead
- You're producing a private print run for friends and family
- You're publishing a free Kindle-only ebook with no retail ambitions
You probably need an ISBN if:
- You want to be sold at independent bookshops (they order through Nielsen, which requires ISBNs)
- You want to be available in UK libraries (legal-deposit-eligible)
- You want to be listed in retail-discovery databases (BookFinder, AbeBooks, etc.)
- You want to use IngramSpark, BookBaby, or another non-Amazon distributor (they require ISBNs)
- You want to maintain control of your imprint identity (the ISBN's publisher field is yours)
- You want metadata you actually own (more on this in the next section)
Different formats need different ISBNs. A paperback, a hardback, a Kindle edition, and a reflowable EPUB are four separate ISBNs — even for the same book content. This is what makes the £174 ten-pack feel reasonable: a typical novel needs 3-4 ISBNs across formats.
If you're set on owning your own ISBNs, buy from Nielsen Book Services at nielsenbook.co.uk. They're the official UK ISBN agency. Do not buy from third-party "ISBN resellers" — they often issue ISBNs that list themselves as the publisher, which causes ownership issues later.
For the cost trade-off in context, see the cost breakdown in our UK copyright hub.
Do I need to do anything for copyright?
In the UK: no — copyright is automatic on creation. Section 9 of the Copyright, Designs and Patents Act 1988 makes the author the first owner of copyright in their work, the moment the work is "fixed" (written down, typed, recorded, etc.).
What you should do for your own benefit:
Keep dated drafts. The strongest proof of authorship date is a chain of timestamped files showing the work evolving. Save your Word/Scrivener files with versioned filenames, keep email drafts, keep printouts. Cloud-storage timestamps are usually admissible if your account history is intact.
Add a copyright notice to your published version. The "Copyright © 2026 [Your Name]" line on your copyright page. See our copyright page template for the full standard text.
Assert moral rights explicitly. One line on the copyright page: "[Your Name] asserts the moral right to be identified as the author of this work." Without this, moral rights (the right to be credited as author, the right to object to derogatory treatment) are not enforceable in the UK.
Optional: register with the UK Copyright Service (£59.50–£109). They issue a timestamped certificate. Not legally required, but useful evidence if you ever end up disputing authorship date.
Optional: use a blockchain-timestamping service like OpenTimestamps. Free, cryptographically verifiable, increasingly admissible.
None of these create your copyright. They just create evidence you can use to enforce it.
The Amazon free ISBN trap
Amazon will issue a free ISBN-equivalent identifier called an ASIN (Amazon Standard Identification Number). It looks similar to an ISBN at a glance (10 characters, mixed letters and numbers like B0CXY7P3K2). It is not an ISBN.
What the free Amazon ASIN gives you:
- A way to be identified within Amazon's system
- Free
- Easy
What the free Amazon ASIN does NOT give you:
- Eligibility for distribution outside Amazon
- A way to migrate your book to a different platform without a new identifier
- Ownership of the publisher metadata (Amazon's name appears as the publisher of record)
- Listing in Nielsen's BookData (the database UK bookshops use)
- A clean record of authorship that survives if Amazon ever deactivates your account
The free ASIN is fine if your only plan is to sell on Amazon and you have low ambition for your book's commercial life. For anyone with broader ambitions, the £93 or £174 Nielsen ISBN cost is one of the smallest worthwhile expenditures in self-publishing.
(Amazon also offers a free KDP-supplied ISBN, separate from the ASIN. This is a real ISBN, but it lists Amazon as the publisher of record. You can't move that ISBN to another retailer. Same trap, different name.)
A confusion I encounter often: an author who has been publishing exclusively on KDP with the free Amazon ASIN, who panics when their KDP account gets suspended (sometimes for unrelated reasons) and thinks they've "lost their copyright". The truth is that the copyright is theirs, untouched — but the Amazon-supplied ASIN is tied to the suspended account, which means they can't trivially re-publish the same identifier elsewhere. This is the cleanest argument for buying Nielsen ISBNs even if you only plan to sell on Amazon: the £93 cost is a portability insurance policy.
How they interact on your copyright page
Your copyright page should display both — clearly separated:
Copyright © 2026 [Your Full Name]
All rights reserved...
ISBN (paperback): 978-1-XXXXX-XXX-X
ISBN (Kindle): 978-1-XXXXX-XXX-X
The copyright notice asserts your legal rights over the content. The ISBNs identify the specific commercial products that contain that content. Both belong on the copyright page because both serve different audiences (one signals to anyone considering copying the text, the other signals to anyone trying to order a copy of the book).
See our full copyright page template for the surrounding boilerplate.
Frequently asked questions
If I have an ISBN, am I "copyrighted"?
No. Buying an ISBN has zero effect on your copyright. You had copyright the moment you wrote the book. The ISBN doesn't grant, evidence, or strengthen that.
If I have copyright, do I still need an ISBN?
Depends where you want to sell. On Amazon alone — no, the ASIN works. Anywhere else — yes.
Can I sell my book without doing either?
You technically can. Practically, you can't sell on most platforms without an ISBN (or an Amazon ASIN), and you'd be foolish to publish work you've authored without claiming copyright on the copyright page.
Does the ISBN tie me to a specific publisher?
The ISBN's publisher field identifies who registered it. If you buy from Nielsen, that's you (or your imprint). If you use Amazon's free KDP-supplied ISBN, Amazon is the publisher of record. If you used a third-party reseller, they're the publisher of record. This matters for libraries and retailers.
Do I need a separate ISBN for each printing or just each edition?
Each edition needs a separate ISBN if there are substantive content changes (new chapter, updated cover, major revisions). Reprints of the same edition reuse the existing ISBN. The British Library's National Bibliographic Standards group documents the threshold — but as a rule, anything you'd describe as "Second Edition" needs a new ISBN.
Can I sell the ISBN if I no longer want the book?
Technically — an ISBN belongs to the registrant (you, if you bought it from Nielsen). It's an asset on a balance sheet. Whether anyone wants to buy it is a different question; ISBNs are tied to specific titles, so a transfer involves paperwork with Nielsen and is uncommon outside business sales.
What about my Kindle ebook? Do those need ISBNs?
Optional. Many ebook-only self-publishers skip the ISBN and let Amazon's ASIN do the job. If you might ever release on Apple Books, Kobo, or other ebook stores, you'll want an EPUB ISBN. Each format = its own ISBN.
Can copyright expire? Does my ISBN?
Copyright expires 70 years after the author's death (UK law). Your ISBN does not expire — but if the book goes out of print and stays that way for years, the ISBN essentially becomes a dormant database entry. It's still yours.
What if someone copies my book — does the ISBN help?
Your copyright is what gives you the right to act. The ISBN helps identify the specific edition that was copied, which can be useful in a claim. But the right itself comes from copyright.
Final thoughts
ISBN and copyright are different tools doing different jobs. Don't confuse them. Don't substitute one for the other. The instinct to "tidy them up" into one concept is the root of most of the confusion in this area.
- Copyright: automatic, free, protects the work, lasts decades.
- ISBN: bought, optional (for Amazon-only) or essential (for everyone else), identifies the product, never expires.
If you want to maximise your book's commercial reach, buy a block of ten ISBNs from Nielsen, use the copyright page template to wire both correctly into your front matter, then run the free KDP Readiness Score to confirm the metadata's properly embedded in your PDF.
For the deeper UK copyright picture — automatic protection, legal deposit, fair dealing, all of it — see our UK copyright hub.
— Robert publishing.co.uk
About the author
Robert Prime is the founder of publishing.co.uk and a UK self-published author who has personally bought multiple Nielsen ISBN blocks for his own work. 25 years in eCommerce and Amazon marketplace operations, including 500+ KDP formatting jobs at publishing.co.uk. Questions: hello@publishing.co.uk.
