Social Magnum HEIC to JPG — decoder notices and corresponding source

The browser loads unmodified libheif-js 1.23.2 as a separate runtime library:
/heic/vendor/libheif-bundle.js
No photo is transmitted to a server for decoding.

Components:
- libheif-js 1.23.2 by Kiril Vatev and contributors, LGPL-3.0.
  Repository: https://github.com/catdad-experiments/libheif-js
  Exact revision: 6ca00b818c0ff51cb2a5c75b9ce97d708083335a
- libheif at ac1cb05c39008f01525c991ff8b88f84ddf70fd2, LGPL-3.0-or-later.
  Repository: https://github.com/strukturag/libheif
- libde265 1.0.15, LGPL-3.0-or-later.
  Repository: https://github.com/strukturag/libde265

Full license texts:
/heic/licenses/libheif-js-LGPL-3.0.txt
/heic/licenses/libheif-COPYING.txt
/heic/licenses/libde265-LGPL-3.0.txt
/heic/licenses/GPL-3.0.txt

The libraries are provided WITHOUT ANY WARRANTY, including the implied
warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Corresponding source and build recipes (same server, no charge):
/free-tools/heic-to-jpg/sources/libheif-js-1.23.2.tar.gz
/free-tools/heic-to-jpg/sources/libheif-ac1cb05.tar.gz
/free-tools/heic-to-jpg/sources/libde265-1.0.15.tar.gz
/free-tools/heic-to-jpg/sources/build-1.23.2.tar.gz

Build/replacement:
1. Extract the libheif-emscripten build archive. Put the exact libheif source
   at its libheif/ subdirectory. Its .github/workflows/emscripten.yml records
   the Emscripten 3.1.61 setup and build steps (WASM, USE_UNSAFE_EVAL=0).
2. libheif/build-emscripten.sh records the libde265 1.0.15 dependency and
   compile/link flags. Use the supplied libde265 release source at the path
   expected by that script. Optional AOM/WebCodecs codecs are disabled.
3. Follow the build workflow to create libheif.tar.gz. Extract the libheif-js
   source, install its development dependencies and run
   node scripts/install.js /absolute/path/to/libheif.tar.gz
   to produce libheif-wasm/libheif-bundle.js.
4. The adapter /heic/decode-worker.js loads the decoder independently using
   importScripts and its public HeifDecoder API. Replace the separate bundle
   with a compatible modified build in your copy of the application, or use
   browser local response overrides to test a replacement. Our adapter does
   not check the decoder's hash, signature or identity at runtime.

You may modify and reverse engineer the library and the combined work for
purposes of debugging those modifications, as permitted by the LGPL. Nothing
in the site's terms is intended to restrict those library rights.

Emscripten 3.1.61 compiler/runtime notices (MIT and University of Illinois/NCSA):
/heic/licenses/emscripten-LICENSE.txt
Source and toolchain setup: https://github.com/emscripten-core/emscripten/tree/3.1.61