All files are distributed as Public Domain, except for the followings:

Files under ALAC, include/ALAC*.h:
These are part of Apple Lossless Audio Codec Project distribution
(http://alac.macosforge.org/). Slightly modified.

Files under taglib:
These are part of TagLib (https://github.com/taglib/taglib/),
(tfile.cpp is modified to remove undesired dependencies)

getopt.[ch]:
These are from FreeBSD CVS repositry
(http://www.freebsd.org/cgi/cvsweb.cgi/),
and modified to use wchar_t instead of char.

Files under include/FLAC:
These are header files of FLAC (http://flac.sourceforge.net/),
version 1.2.1

include/sndfile.h:
This is a header file of libsndfile (http://www.mega-nerd.com/libsndfile/),
version 1.0.24

include/wavpack.h:
This is a header file of WavPack (http://www.wavpack.com/)

include/tak_deco_lib.h:
This is a header file of TAK (http://www.thbeck.de/Tak/Tak.html),
version 2.2.0

include/soxr.h:
This is a header file of libsoxr (https://sourceforge.net/projects/soxr/).

include/opus:
These are header files of Opus (https://opus-codec.org/).

include/vorbis/codec.h:
This is a header file of libvorbis (https://xiph.org/vorbis/),
distributed under a BSD-style license.

Files under uchardet:
These are part of uchardet (https://gitlab.freedesktop.org/uchardet/uchardet/),
derived from Mozilla's universal charset detector code, distributed under
MPL 1.1/GPL 2.0/LGPL 2.1.

Files under ogg:
These are part of libogg (https://xiph.org/ogg/).

include/vorbis/codec.h:
This is a header file of libvorbis (https://xiph.org/vorbis/),
distributed under a BSD-style license.

Files under libsoundio:
This is libsoundio (http://libsound.io/), Copyright (c) 2015 Andrew Kelley,
distributed under the MIT license.

include/utf8, include/utf8.h:
These are part of utfcpp (https://github.com/nemtrif/utfcpp).

fft4g/fft4g.c:
General purpose FFT package by Takuya Ooura
(http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html).
"You may use, copy, modify and distribute this code for any purpose
(include commercial use) and without fee."

Files under mmtisobmff:
These are part of the Fraunhofer FDK MPEG-H Software's ISOBMFF library
(mmtisobmff), Copyright (c) 2016-2023 Fraunhofer-Gesellschaft, distributed
under the Fraunhofer FDK MPEG-H Software License.