Reuse and Licenses
Updated
Rerun the sums, then republish them. Most of what this site makes can be reused with a credit, and the sections below set out which parts and how.
Figures and CSV files: CC BY 4.0
The figures drawn for this site (comparison charts, chain overviews, paradox state tables, community timelines) and its Check my math CSV files are released under Creative Commons Attribution 4.0. You may copy, change and sell them as long as you give credit.
Each figure offers a credit line to copy, and that line tells you which terms apply to it. For figures under CC BY, the form is:
"{figure title}" by The What-If Observatory, {page URL}, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Replace {figure title} with the figure's name and {page URL} with the address of the page it comes from. A link back to the page is expected, but it is not a condition of reuse.
The license covers only what this site drew or calculated. A figure built on a third-party base layer, such as a public-domain scan, credits that layer separately on its own line.
CSV files hold single values and this site's own results, with a source number on every row. CC BY covers this site's selection and calculations. It gives you no rights in the sources behind them. Each CSV download has a small information file beside it that gives its license and sources.
If you change a figure or a file, say so in your credit. If you rerun a sum with your own inputs, the new result is yours, and the credit should make clear that this site did not produce it.
What the license leaves out
Article text is not released under CC BY. Quote it as you would any published work, with a link.
Illustrations are also outside the license and may not be reused. They are marked with this line:
Illustration: The What-If Observatory. Generated schematic illustration — not a photograph or historical record. © The What-If Observatory, all rights reserved.
Third-party images
Other images keep their own terms, and each has its own credit line naming the work, its creator, the source page and the license or public-domain basis. Any change, such as a crop, is named there too.
The first set of pages includes paintings, prints, engravings and photographs in the public domain, works an institution has released under CC0 or marked with the Public Domain Mark, and US government photographs. The accepted licenses are CC0, the Public Domain Mark, CC BY and CC BY-SA, and nothing limited to non-commercial use or barred from adaptation is used.
Public domain here means a stated basis checked image by image. A typical line takes the form Public domain in the US (published {year}) and in the EU (author died {year}, life+70). To reuse one of these images, take the credit from the image and check the source page, because a holder's scan can carry conditions of its own.
Fonts
The site is set in Bricolage Grotesque, Gelasio and Source Code Pro, all under the SIL Open Font License 1.1.
Citing a page
Each article has a Cite this page block giving The What-If Observatory as the author, the title, the publication date, the date of the last substantive revision and the page address. Add the date you read it if your citation style asks for one. Revision dates move when a page is corrected, as the Corrections page explains. This site does not issue DOIs.
Questions about reuse can go to the address on the Contact page.