Third-party code, unmodified except where noted.

epub.min.js   epub.js 0.3.93 — BSD-2-Clause — https://github.com/futurepress/epub.js
jszip.min.js  JSZip 3.10.1 — MIT/GPLv3 — https://stuk.github.io/jszip/
hangul.js     Hangul.js 0.2.6 — MIT, Jaemin Jo — https://github.com/e-/Hangul.js
              Modified: the UMD footer was replaced with an ES module export.
