HEIC photo conversion uses heic-to 1.6.7, licensed under LGPL-3.0-or-later.
The library is unmodified; it is downloaded separately only when native decoding is unavailable.
Library project: https://github.com/hoppergee/heic-to
Exact published package and source: source.tgz
Includes libheif 1.23.7 and libde265 1.0.16.
Codec source: libheif-source.tar.gz
Codec source: libde265-source.tar.gz
Build instructions: https://github.com/hoppergee/heic-to#how-to-build-libheifjs-from-libheif-on-mac
LGPL: LICENSE.txt
GPL: GPL-3.0.txt