Public domain, done right

When a brief calls for research or public-domain reference material, xDocs only ever pulls from sources that are actually clear to use — Project Gutenberg, Standard Ebooks, and a handful of other catalogs with unambiguous public-domain status.

No scraped fan sites, no gray-area archives, no "probably fine" sources. Every citation a chapter draws on is traceable back to where it came from, so what you publish is something you can stand behind.

Why this is worth the extra care

It would be faster to point a crawler at the open web and let it grab whatever text matches. It would also be a liability you'd inherit the moment you published. We'd rather ship a slightly smaller source catalog than a legally murky one.