[libgpiod][PATCH 1/2] licensing: relicense C++ bindings under LGPL-2.1-or-later

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Commit ea84f882d5d3 ("licensing: relicense C++ library code under
LGPL-3.0-or-later") changed the license of C++ bindings in order to
solve potential issues with code generated from templates[1], default
implementations, etc. However this change makes the bindings less
attractive to projects that have strict licensing restrictions and avoid
GPL-3.0 code[2].

After talking to Grant Likely I decided that the best approach is to
make the bindings available under LGPL-v2.1-or-later and simply let the
end user decide which version's text to apply.

While at it: tweak the README to also mention that examples are provided
under GPL-2.0-or-later.

Link: [1] https://www.spinics.net/lists/linux-gpio/msg46605.html
Link: [2] https://github.com/brgl/libgpiod/issues/72
Suggested-by: Walter Lozano <walter.lozano@collabora.com>
Suggested-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 COPYING                                     |  11 +-
 LICENSES/LGPL-3.0-or-later.txt              | 165 --------------------
 bindings/cxx/chip-info.cpp                  |   2 +-
 bindings/cxx/chip.cpp                       |   2 +-
 bindings/cxx/edge-event-buffer.cpp          |   2 +-
 bindings/cxx/edge-event.cpp                 |   2 +-
 bindings/cxx/exception.cpp                  |   2 +-
 bindings/cxx/gpiod.hpp                      |   2 +-
 bindings/cxx/gpiodcxx/chip-info.hpp         |   2 +-
 bindings/cxx/gpiodcxx/chip.hpp              |   2 +-
 bindings/cxx/gpiodcxx/edge-event-buffer.hpp |   2 +-
 bindings/cxx/gpiodcxx/edge-event.hpp        |   2 +-
 bindings/cxx/gpiodcxx/exception.hpp         |   2 +-
 bindings/cxx/gpiodcxx/info-event.hpp        |   2 +-
 bindings/cxx/gpiodcxx/line-config.hpp       |   2 +-
 bindings/cxx/gpiodcxx/line-info.hpp         |   2 +-
 bindings/cxx/gpiodcxx/line-request.hpp      |   2 +-
 bindings/cxx/gpiodcxx/line-settings.hpp     |   2 +-
 bindings/cxx/gpiodcxx/line.hpp              |   2 +-
 bindings/cxx/gpiodcxx/misc.hpp              |   2 +-
 bindings/cxx/gpiodcxx/request-builder.hpp   |   2 +-
 bindings/cxx/gpiodcxx/request-config.hpp    |   2 +-
 bindings/cxx/gpiodcxx/timestamp.hpp         |   2 +-
 bindings/cxx/info-event.cpp                 |   2 +-
 bindings/cxx/internal.cpp                   |   2 +-
 bindings/cxx/internal.hpp                   |   2 +-
 bindings/cxx/line-config.cpp                |   2 +-
 bindings/cxx/line-info.cpp                  |   2 +-
 bindings/cxx/line-request.cpp               |   2 +-
 bindings/cxx/line-settings.cpp              |   2 +-
 bindings/cxx/line.cpp                       |   2 +-
 bindings/cxx/misc.cpp                       |   2 +-
 bindings/cxx/request-builder.cpp            |   2 +-
 bindings/cxx/request-config.cpp             |   2 +-
 bindings/cxx/tests/gpiosim.cpp              |   2 +-
 bindings/cxx/tests/gpiosim.hpp              |   2 +-
 bindings/cxx/tests/helpers.cpp              |   2 +-
 bindings/cxx/tests/helpers.hpp              |   2 +-
 38 files changed, 37 insertions(+), 211 deletions(-)
 delete mode 100644 LICENSES/LGPL-3.0-or-later.txt

diff --git a/COPYING b/COPYING
index 87a9de5..84b4fc6 100644
--- a/COPYING
+++ b/COPYING
@@ -7,7 +7,7 @@ or any later version according with:
 
     LICENSES/LGPL-2.1-or-later.txt
 
-gpio-tools and test suites are provided under:
+gpio-tools, test suites and examples are provided under:
 
     SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -16,15 +16,6 @@ later version according with:
 
     LICENSES/GPL-2.0-or-later.txt
 
-C++ bindings to libgpiod are provided under:
-
-    SPDX-License-Identifier: LGPL-3.0-or-later
-
-Being under the terms of the GNU Lesser General Public License version 3.0
-or any later version according with:
-
-    LICENSES/LGPL-3.0-or-later.txt
-
 The Linux Kernel uAPI headers are provided under:
 
     SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note
diff --git a/LICENSES/LGPL-3.0-or-later.txt b/LICENSES/LGPL-3.0-or-later.txt
deleted file mode 100644
index 0a04128..0000000
--- a/LICENSES/LGPL-3.0-or-later.txt
+++ /dev/null
@@ -1,165 +0,0 @@
-                   GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
- Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-
-  This version of the GNU Lesser General Public License incorporates
-the terms and conditions of version 3 of the GNU General Public
-License, supplemented by the additional permissions listed below.
-
-  0. Additional Definitions.
-
-  As used herein, "this License" refers to version 3 of the GNU Lesser
-General Public License, and the "GNU GPL" refers to version 3 of the GNU
-General Public License.
-
-  "The Library" refers to a covered work governed by this License,
-other than an Application or a Combined Work as defined below.
-
-  An "Application" is any work that makes use of an interface provided
-by the Library, but which is not otherwise based on the Library.
-Defining a subclass of a class defined by the Library is deemed a mode
-of using an interface provided by the Library.
-
-  A "Combined Work" is a work produced by combining or linking an
-Application with the Library.  The particular version of the Library
-with which the Combined Work was made is also called the "Linked
-Version".
-
-  The "Minimal Corresponding Source" for a Combined Work means the
-Corresponding Source for the Combined Work, excluding any source code
-for portions of the Combined Work that, considered in isolation, are
-based on the Application, and not on the Linked Version.
-
-  The "Corresponding Application Code" for a Combined Work means the
-object code and/or source code for the Application, including any data
-and utility programs needed for reproducing the Combined Work from the
-Application, but excluding the System Libraries of the Combined Work.
-
-  1. Exception to Section 3 of the GNU GPL.
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-  You may convey a covered work under sections 3 and 4 of this License
-without being bound by section 3 of the GNU GPL.
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-   Library is used in it and that the Library and its use are
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-   the Library is used in it and that the Library and its use are
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-   execution, include the copyright notice for the Library among
-   these notices, as well as a reference directing the user to the
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diff --git a/bindings/cxx/chip-info.cpp b/bindings/cxx/chip-info.cpp
index c4f0ab5..93dd6f5 100644
--- a/bindings/cxx/chip-info.cpp
+++ b/bindings/cxx/chip-info.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <ostream>
diff --git a/bindings/cxx/chip.cpp b/bindings/cxx/chip.cpp
index d6a3a43..8086839 100644
--- a/bindings/cxx/chip.cpp
+++ b/bindings/cxx/chip.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <ostream>
diff --git a/bindings/cxx/edge-event-buffer.cpp b/bindings/cxx/edge-event-buffer.cpp
index c7347a2..0d5cb36 100644
--- a/bindings/cxx/edge-event-buffer.cpp
+++ b/bindings/cxx/edge-event-buffer.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <iterator>
diff --git a/bindings/cxx/edge-event.cpp b/bindings/cxx/edge-event.cpp
index 5ff3af2..9ef311c 100644
--- a/bindings/cxx/edge-event.cpp
+++ b/bindings/cxx/edge-event.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <map>
diff --git a/bindings/cxx/exception.cpp b/bindings/cxx/exception.cpp
index 6957e78..378b249 100644
--- a/bindings/cxx/exception.cpp
+++ b/bindings/cxx/exception.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include "internal.hpp"
diff --git a/bindings/cxx/gpiod.hpp b/bindings/cxx/gpiod.hpp
index b090af4..91e41a5 100644
--- a/bindings/cxx/gpiod.hpp
+++ b/bindings/cxx/gpiod.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/chip-info.hpp b/bindings/cxx/gpiodcxx/chip-info.hpp
index b6bd0f8..e740e94 100644
--- a/bindings/cxx/gpiodcxx/chip-info.hpp
+++ b/bindings/cxx/gpiodcxx/chip-info.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/chip.hpp b/bindings/cxx/gpiodcxx/chip.hpp
index 297db3d..4d67476 100644
--- a/bindings/cxx/gpiodcxx/chip.hpp
+++ b/bindings/cxx/gpiodcxx/chip.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/edge-event-buffer.hpp b/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
index 025517f..2482e8a 100644
--- a/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
+++ b/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/edge-event.hpp b/bindings/cxx/gpiodcxx/edge-event.hpp
index 4fde561..47c256a 100644
--- a/bindings/cxx/gpiodcxx/edge-event.hpp
+++ b/bindings/cxx/gpiodcxx/edge-event.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/exception.hpp b/bindings/cxx/gpiodcxx/exception.hpp
index e89b384..34737d2 100644
--- a/bindings/cxx/gpiodcxx/exception.hpp
+++ b/bindings/cxx/gpiodcxx/exception.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/info-event.hpp b/bindings/cxx/gpiodcxx/info-event.hpp
index e99cbc4..69b88b6 100644
--- a/bindings/cxx/gpiodcxx/info-event.hpp
+++ b/bindings/cxx/gpiodcxx/info-event.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/line-config.hpp b/bindings/cxx/gpiodcxx/line-config.hpp
index 8a3335c..58c9d87 100644
--- a/bindings/cxx/gpiodcxx/line-config.hpp
+++ b/bindings/cxx/gpiodcxx/line-config.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/line-info.hpp b/bindings/cxx/gpiodcxx/line-info.hpp
index 26d25a9..8b10dc4 100644
--- a/bindings/cxx/gpiodcxx/line-info.hpp
+++ b/bindings/cxx/gpiodcxx/line-info.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/line-request.hpp b/bindings/cxx/gpiodcxx/line-request.hpp
index dfe3e0f..fcc4e0e 100644
--- a/bindings/cxx/gpiodcxx/line-request.hpp
+++ b/bindings/cxx/gpiodcxx/line-request.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/line-settings.hpp b/bindings/cxx/gpiodcxx/line-settings.hpp
index bacf359..1004ccd 100644
--- a/bindings/cxx/gpiodcxx/line-settings.hpp
+++ b/bindings/cxx/gpiodcxx/line-settings.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/line.hpp b/bindings/cxx/gpiodcxx/line.hpp
index 5d0752a..2810571 100644
--- a/bindings/cxx/gpiodcxx/line.hpp
+++ b/bindings/cxx/gpiodcxx/line.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/misc.hpp b/bindings/cxx/gpiodcxx/misc.hpp
index 1e41e9b..eab8eba 100644
--- a/bindings/cxx/gpiodcxx/misc.hpp
+++ b/bindings/cxx/gpiodcxx/misc.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/request-builder.hpp b/bindings/cxx/gpiodcxx/request-builder.hpp
index 90cc8f0..192bd91 100644
--- a/bindings/cxx/gpiodcxx/request-builder.hpp
+++ b/bindings/cxx/gpiodcxx/request-builder.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/request-config.hpp b/bindings/cxx/gpiodcxx/request-config.hpp
index b099eb1..6ebbf99 100644
--- a/bindings/cxx/gpiodcxx/request-config.hpp
+++ b/bindings/cxx/gpiodcxx/request-config.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/gpiodcxx/timestamp.hpp b/bindings/cxx/gpiodcxx/timestamp.hpp
index 7143ab3..fcb4d8d 100644
--- a/bindings/cxx/gpiodcxx/timestamp.hpp
+++ b/bindings/cxx/gpiodcxx/timestamp.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 /**
diff --git a/bindings/cxx/info-event.cpp b/bindings/cxx/info-event.cpp
index 0b19ee9..1f6d0d7 100644
--- a/bindings/cxx/info-event.cpp
+++ b/bindings/cxx/info-event.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <map>
diff --git a/bindings/cxx/internal.cpp b/bindings/cxx/internal.cpp
index 9f1f38f..237d5d5 100644
--- a/bindings/cxx/internal.cpp
+++ b/bindings/cxx/internal.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <map>
diff --git a/bindings/cxx/internal.hpp b/bindings/cxx/internal.hpp
index db78af6..b64daf1 100644
--- a/bindings/cxx/internal.hpp
+++ b/bindings/cxx/internal.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 #ifndef __LIBGPIOD_CXX_INTERNAL_HPP__
diff --git a/bindings/cxx/line-config.cpp b/bindings/cxx/line-config.cpp
index 1179e0a..7e3dc8c 100644
--- a/bindings/cxx/line-config.cpp
+++ b/bindings/cxx/line-config.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <cstdlib>
diff --git a/bindings/cxx/line-info.cpp b/bindings/cxx/line-info.cpp
index 9931ed0..2117f68 100644
--- a/bindings/cxx/line-info.cpp
+++ b/bindings/cxx/line-info.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <map>
diff --git a/bindings/cxx/line-request.cpp b/bindings/cxx/line-request.cpp
index e8e0b96..f6b0a66 100644
--- a/bindings/cxx/line-request.cpp
+++ b/bindings/cxx/line-request.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <iterator>
diff --git a/bindings/cxx/line-settings.cpp b/bindings/cxx/line-settings.cpp
index 30d7899..300858a 100644
--- a/bindings/cxx/line-settings.cpp
+++ b/bindings/cxx/line-settings.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <map>
diff --git a/bindings/cxx/line.cpp b/bindings/cxx/line.cpp
index d99e8fa..d6a92c1 100644
--- a/bindings/cxx/line.cpp
+++ b/bindings/cxx/line.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <iterator>
diff --git a/bindings/cxx/misc.cpp b/bindings/cxx/misc.cpp
index dde48e0..eba0b46 100644
--- a/bindings/cxx/misc.cpp
+++ b/bindings/cxx/misc.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include "internal.hpp"
diff --git a/bindings/cxx/request-builder.cpp b/bindings/cxx/request-builder.cpp
index d11e47b..87ee2fe 100644
--- a/bindings/cxx/request-builder.cpp
+++ b/bindings/cxx/request-builder.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <ostream>
diff --git a/bindings/cxx/request-config.cpp b/bindings/cxx/request-config.cpp
index e578b15..b44b8b6 100644
--- a/bindings/cxx/request-config.cpp
+++ b/bindings/cxx/request-config.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include <ostream>
diff --git a/bindings/cxx/tests/gpiosim.cpp b/bindings/cxx/tests/gpiosim.cpp
index 7267e6d..4bda5a2 100644
--- a/bindings/cxx/tests/gpiosim.cpp
+++ b/bindings/cxx/tests/gpiosim.cpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 #include <map>
diff --git a/bindings/cxx/tests/gpiosim.hpp b/bindings/cxx/tests/gpiosim.hpp
index 320ae96..8151af6 100644
--- a/bindings/cxx/tests/gpiosim.hpp
+++ b/bindings/cxx/tests/gpiosim.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 #ifndef __GPIOD_CXX_GPIOSIM_HPP__
diff --git a/bindings/cxx/tests/helpers.cpp b/bindings/cxx/tests/helpers.cpp
index 6534fdb..eb2c3db 100644
--- a/bindings/cxx/tests/helpers.cpp
+++ b/bindings/cxx/tests/helpers.cpp
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: LGPL-3.0-or-later
+// SPDX-License-Identifier: LGPL-2.1-or-later
 // SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl>
 
 #include "helpers.hpp"
diff --git a/bindings/cxx/tests/helpers.hpp b/bindings/cxx/tests/helpers.hpp
index 157d221..62d9827 100644
--- a/bindings/cxx/tests/helpers.hpp
+++ b/bindings/cxx/tests/helpers.hpp
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 /* SPDX-FileCopyrightText: 2021-2022 Bartosz Golaszewski <brgl@bgdev.pl> */
 
 #ifndef __GPIOD_CXX_TEST_HELPERS_HPP__
-- 
2.40.1