The Kivoza HEIC decoder bundles libheif v1.23.4 from the official
strukturag/libheif source repository:

https://github.com/strukturag/libheif/tree/v1.23.4

libheif is distributed under the GNU Lesser General Public License,
version 3.0. The complete license text is provided as
`libheif-COPYING.txt` in this directory. The corresponding source archive
and the Kivoza build/rebuild materials are available in the public
`source/` directory and listed at `/licenses/`. The source archive is the
official v1.23.4 release; its SHA-256 and the exact build inputs are listed
in `source/README.txt`.