libgpiod is provided under:

    SPDX-License-Identifier: LGPL-2.1-or-later

Being under the terms of the GNU Lesser General Public License version 2.1
or any later version according with:

    LICENSES/LGPL-2.1-or-later.txt

gpio-tools, test suites and examples are provided under:

    SPDX-License-Identifier: GPL-2.0-or-later

Being under the terms of the GNU General Public License version 2.0 or any
later version according with:

    LICENSES/GPL-2.0-or-later.txt

The Linux Kernel uAPI headers are provided under:

    SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note

Being under the terms of the GNU General Public License version 2 only,
according with:

    LICENSES/GPL-2.0-only.txt

With an explicit syscall exception, as stated at:

    LICENSES/Linux-syscall-note.txt

libgpiod text files are provided under:

    SPDX-License-Identifier: CC-BY-SA-4.0

Being under the terms of the Creative Commons Attribution-ShareAlike 4.0
International License according with:

    LICENSES/CC-BY-SA-4.0.txt

All contributions to libgpiod are subject to this COPYING file.