Ebook publishing questions nobody wants to ask out loud: ISBNs, exclusivity, publication, records

What to take away

Common ebook marketing questions should be answered for a named title, edition, and format. Add the territory, reader, seller, and campaign period. Policies vary across distributors and countries, and a marketing shortcut can create a metadata, rights, tax, or customer-support problem. Keep an owner and review date beside every operating answer.

Does every ebook need an ISBN?

The International ISBN Agency's guidance for digital publications explains that separate digital formats or usage constraints can make publications distinct products that need separate ISBNs. A reflowable EPUB, a fixed-layout PDF and a paperback can each carry its own number.

Bowker sells US ISBNs through MyIdentifiers, typically about $125 for one and about $295 for ten as of 2026. Amazon KDP assigns a free ISBN to a Kindle edition, and it stays inside Amazon's store.

IngramSpark and most library aggregators want an ISBN you own. A seller may have its own requirements, so confirm the current rules for every channel rather than presenting the ISBN as a universal legal or quality requirement.

Decide identifiers with the distribution plan, and preserve the mapping among title, subtitle, contributor, edition, and file. Map format, territory, seller record, and internal product ID. Never reuse an ISBN for another edition.

Correct mismatched metadata before a campaign sends readers to competing or obsolete records. Clean identifiers support affiliate marketing for digital products, where partners need accurate links and tracking.

Should the book be exclusive?

Compare the actual program term, allowed formats, subscription treatment, promotional tools, and royalties. Check territories, renewal, removal timing, and the effect on direct or library distribution.

KDP Select runs in 90-day terms and renews unless you switch it off. Enrollment puts the ebook in Kindle Unlimited, where a page read has paid roughly $0.004 in recent months, and it blocks Kobo Plus, Everand and most library channels for that title.

Kobo Plus pays per page read without the Amazon tie. Apple Books, Barnes & Noble Press, Google Play Books and Draft2Digital keep a title eligible for OverDrive, Hoopla and Libby. ACX pays 40% on an exclusive seven-year audiobook deal and 25% on a non-exclusive one.

Model the opportunity cost and test an exit before enrollment. An attractive feature is not enough if the restriction conflicts with the audience's preferred channel.

Does posting a full ebook on a website count as publication?

Publication questions affect registration, deposit, contracts, evidence, and edition records. Do not infer legal status from whether a file is visible or downloadable. The seller's own jurisdiction decides whether posting a full ebook on a website counts as publication. In the United States, the Copyright Office says mere posting without authorization to retain copies is not publication.

Canada's Copyright Act treats making copies available to the public as publication. Check the local statute for the seller's market. Record who authorized distribution, what copies were offered, to whom, on which terms, and when. Seek qualified advice for the work and jurisdiction.

The U.S. Copyright Office's circular on websites and website content explains registration practices and notes that merely posting a work without authorizing users to retain copies does not itself constitute publication. The circular is U.S. administrative guidance about website content, not a legal conclusion for every ebook transaction or country.

Keep a decision record for each ebook question

The GAO evaluation design guide connects evaluation questions with evidence needs and design choices. Apply that discipline to common ebook marketing questions.

The W3C Privacy Principles statement gives web-system designers shared privacy concepts and warns against shifting privacy work to individuals.

Use this template for each ebook question:

If the same question returns, compare the records before changing the metric.

Pull numbers from one dashboard per channel: KDP Reports, Kobo Writing Life, Apple Books Connect, Google Play Books Partner Center and IngramSpark. Book list open rates typically run 20% to 40%, with clicks near 2% to 5%.

For common ebook marketing questions, keep the evidence record beside the decision so a reviewer can reproduce the reasoning without relying on memory.

Set the next review date for common ebook marketing questions and name the change that would trigger an earlier check. A dated evidence record also helps when you sort digital product strategy tools by export and cost.

Common questions

Is a PDF an ebook?

It can be sold as one, but suitability depends on layout, device, and search. Reflow, navigation, accessibility, and seller support matter too. A reflowable EPUB reads better on phones, and Amazon KDP and Apple Books both accept one. A fixed-layout PDF suits workbooks that need exact page geometry.

Do I need a separate ISBN for each store?

No. One number covers the same file sold through several retailers. A new format, a new edition or a different publisher name needs its own ISBN.

Can a review be edited?

Do not change a review's meaning. Preserve the source, permission, context, and connection. Keep the date and the exact approved excerpt. Amazon posts reviews from accounts that have spent at least $50 on the site.

How often should metadata be checked?

At launch, after each retailer or edition change, and on a scheduled backlist review.