Open-source notices
====================

This file travels with the website. The same notice is on the About page
at /about#notices. License texts linked below are served from this site.

HEIC / HEIF decoding
--------------------

The HEIC decoder is loaded only when a visitor converts a HEIC or HEIF
file. It is fetched as a separate file:

  /vendor/heic-to/heic-to.js

That file is the unmodified "heic-to/csp" build of heic-to 1.6.7
(LGPL-3.0-or-later), written by Hopper Gee.
Source: https://github.com/hoppergee/heic-to
License text: /licenses/heic-to-lgpl-3.0.txt

heic-to 1.6.7 states that it is built with libheif 1.23.7
(LGPL-3.0-or-later).
Copyright (c) 2017 Dirk Farin and contributors, as carried in the libheif sources.
Source: https://github.com/strukturag/libheif  (tag v1.23.7)
License text: /licenses/libheif-COPYING.txt

libheif decodes HEVC image data with libde265 (LGPL-3.0-or-later).
Copyright (c) 2013-2014 struktur AG, Dirk Farin.
Source: https://github.com/strukturag/libde265
The heic-to build instructions for this generation of the library
reference libde265 1.0.16. This site does not rebuild libheif; it ships
the prebuilt heic-to file unchanged.
License text: /licenses/libde265-COPYING.txt

The GNU GPL version 3, which the LGPL incorporates by reference, is at
/licenses/gpl-3.0.txt
Upstream copies:
  https://www.gnu.org/licenses/lgpl-3.0.txt
  https://www.gnu.org/licenses/gpl-3.0.txt

The decoder is not statically linked into the site's own scripts. The
page imports /vendor/heic-to/heic-to.js at runtime, and only after a
HEIC file is added. WebP and AVIF conversion do not load it. They use
the browser's createImageBitmap and a canvas.

No integrity hash pins the decoder file. To use a modified libheif,
replace /vendor/heic-to/heic-to.js (or the same path under the built
dist/ directory) with an ES module that still exports:

  heicTo({ blob, type: "bitmap" }) -> Promise<ImageBitmap>
  isHeic(file) -> Promise<boolean>

The rest of the site is not licensed under the LGPL. The LGPL applies
to heic-to, libheif, and libde265.

ZIP downloads
-------------

JSZip 3.10.2 builds the ZIP file in the browser. The package is
dual-licensed MIT OR GPL-3.0-or-later. This site uses it under the MIT
license.
Copyright (c) 2009-2016 Stuart Knightley, David Duponchel, Franz Buchinger, António Afonso.
Source: https://github.com/Stuk/jszip
License text: /licenses/jszip-license.txt

The ZIP is assembled from the files already converted in the tab. It is
not uploaded.