Most of this page will not matter to you. One part does: the fonts your book is set in are embedded in the file you sell, and most commercial font licenses forbid exactly that. These ones do not.
The fonts inside your book
| Face | License | Used for |
|---|---|---|
| EB Garamond | SIL OFL 1.1 | the classic and novel settings |
| Source Serif 4 | SIL OFL 1.1 | the manual setting |
| Crimson Pro | SIL OFL 1.1 | not shipped — we tested it and rejected it, because it has no true small caps |
| Libertinus Serif | SIL OFL 1.1 | Typst's own — reached for a character the faces above do not carry |
| New Computer Modern | SIL OFL 1.1 | Typst's own — reached for mathematics |
| DejaVu Sans Mono | Bitstream Vera Fonts License | Typst's own — reached for monospaced text |
The last three are not ours. A character outside the faces above still has to come from somewhere, and Typst carries its own for that. They are listed because they are embedded in your book exactly as ours are, so their licences are your business as much as ours. All three permit it.
The Open Font License permits embedding a typeface in a document, including one you sell, and permits subsetting, which is what a PDF does. It asks for two things, and both are our responsibility rather than yours: we must not sell the fonts on their own, and we must not rename them.
So you owe nothing, you need to credit no one, and there is no limit on how many copies of your book you print or sell.
What the tool runs
| Component | Version | License |
|---|---|---|
| Typst — the typesetting engine | 0.15.1 | Apache-2.0 |
| EPUBCheck — the reference validator | 5.3.0 | BSD-style (Adobe / IDPF / W3C) |
| Saxon-HE, inside EPUBCheck | 11.4 | MPL-2.0 |
| EPUBCheck's other dependencies | — | Apache-2.0, BSD-3-Clause, MIT |
| Java runtime | 8+ | GPL-2.0 with Classpath Exception |
| Python | 3.9+ | PSF |
Our own code uses no third-party libraries at all. The free tools import nothing. That is why a file you drop into them cannot leave your computer even by accident, and why this table is short enough to read.
One rule decides what we may add here: no AGPL, ever. The AGPL treats use over a network as distribution, so a single AGPL component on a server would require us to publish the source of everything that uses it. That is why we wrote the PDF readers on this site from scratch instead of using the obvious library.
Names that are not ours
Amazon, Kindle Direct Publishing, Kindle Create, IngramSpark, Draft2Digital, Vellum, Atticus and Lacuna are trademarks of their owners. We name them here and on the comparison pages for identification only. We have no affiliation with any of them, and no logo of theirs appears anywhere on this site.