licenses: License all meson files under CC0-1.0

In an attempt to clarify the license terms of all files in the libcamera
project, the build system files deserve particular attention. While they
describe how the binaries are created, they are not themselves
transformed into any part of binary distributions of the software, and
thus don't influence the copyright on the binary packages. They are
however subject to copyright, and thus influence the distribution terms
of the source packages.

Most of the meson.build files would not meet the threshold of
originality criteria required for copyright protection. Some of the more
complex meson.build files may be eligible for copyright protection. To
avoid any ambiguity and uncertainty, state our intent to not assert
copyrights on the build system files by putting them in the public
domain with the CC0-1.0 license.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Acked-by: Paul Elder <paul.elder@ideasonboard.com>
Acked-by: Show Liu <show.liu@linaro.org>

49 files changed, 215 insertions, 0 deletions

diff --git a/Documentation/meson.build b/Documentation/meson.build
index c4e98924..b3b4f0b6 100644
--- a/Documentation/meson.build
+++ b/Documentation/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 doc_install_dir = join_paths(get_option('datadir'), 'doc',
                              'libcamera-@0@'.format(libcamera_version))
 
diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt
new file mode 100644
index 00000000..a343ccd4
--- /dev/null
+++ b/LICENSES/CC0-1.0.txt
@@ -0,0 +1,119 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES
+NOT PROVIDE LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE
+AN ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS INFORMATION
+ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES REGARDING THE USE
+OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED HEREUNDER, AND DISCLAIMS
+LIABILITY FOR DAMAGES RESULTING FROM THE USE OF THIS DOCUMENT OR THE INFORMATION
+OR WORKS PROVIDED HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer exclusive
+Copyright and Related Rights (defined below) upon the creator and subsequent
+owner(s) (each and all, an "owner") of an original work of authorship and/or
+a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for the
+purpose of contributing to a commons of creative, cultural and scientific
+works ("Commons") that the public can reliably and without fear of later claims
+of infringement build upon, modify, incorporate in other works, reuse and
+redistribute as freely as possible in any form whatsoever and for any purposes,
+including without limitation commercial purposes. These owners may contribute
+to the Commons to promote the ideal of a free culture and the further production
+of creative, cultural and scientific works, or to gain reputation or greater
+distribution for their Work in part through the use and efforts of others.
+
+For these and/or other purposes and motivations, and without any expectation
+of additional consideration or compensation, the person associating CC0 with
+a Work (the "Affirmer"), to the extent that he or she is an owner of Copyright
+and Related Rights in the Work, voluntarily elects to apply CC0 to the Work
+and publicly distribute the Work under its terms, with knowledge of his or
+her Copyright and Related Rights in the Work and the meaning and intended
+legal effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be protected
+by copyright and related or neighboring rights ("Copyright and Related Rights").
+Copyright and Related Rights include, but are not limited to, the following:
+
+i. the right to reproduce, adapt, distribute, perform, display, communicate,
+and translate a Work;
+
+      ii. moral rights retained by the original author(s) and/or performer(s);
+
+iii. publicity and privacy rights pertaining to a person's image or likeness
+depicted in a Work;
+
+iv. rights protecting against unfair competition in regards to a Work, subject
+to the limitations in paragraph 4(a), below;
+
+v. rights protecting the extraction, dissemination, use and reuse of data
+in a Work;
+
+vi. database rights (such as those arising under Directive 96/9/EC of the
+European Parliament and of the Council of 11 March 1996 on the legal protection
+of databases, and under any national implementation thereof, including any
+amended or successor version of such directive); and
+
+vii. other similar, equivalent or corresponding rights throughout the world
+based on applicable law or treaty, and any national implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention of,
+applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and
+unconditionally waives, abandons, and surrenders all of Affirmer's Copyright
+and Related Rights and associated claims and causes of action, whether now
+known or unknown (including existing as well as future claims and causes of
+action), in the Work (i) in all territories worldwide, (ii) for the maximum
+duration provided by applicable law or treaty (including future time extensions),
+(iii) in any current or future medium and for any number of copies, and (iv)
+for any purpose whatsoever, including without limitation commercial, advertising
+or promotional purposes (the "Waiver"). Affirmer makes the Waiver for the
+benefit of each member of the public at large and to the detriment of Affirmer's
+heirs and successors, fully intending that such Waiver shall not be subject
+to revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason be
+judged legally invalid or ineffective under applicable law, then the Waiver
+shall be preserved to the maximum extent permitted taking into account Affirmer's
+express Statement of Purpose. In addition, to the extent the Waiver is so
+judged Affirmer hereby grants to each affected person a royalty-free, non
+transferable, non sublicensable, non exclusive, irrevocable and unconditional
+license to exercise Affirmer's Copyright and Related Rights in the Work (i)
+in all territories worldwide, (ii) for the maximum duration provided by applicable
+law or treaty (including future time extensions), (iii) in any current or
+future medium and for any number of copies, and (iv) for any purpose whatsoever,
+including without limitation commercial, advertising or promotional purposes
+(the "License"). The License shall be deemed effective as of the date CC0
+was applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder of
+the License, and in such case Affirmer hereby affirms that he or she will
+not (i) exercise any of his or her remaining Copyright and Related Rights
+in the Work or (ii) assert any associated claims and causes of action with
+respect to the Work, in either case contrary to Affirmer's express Statement
+of Purpose.
+
+   4. Limitations and Disclaimers.
+
+a. No trademark or patent rights held by Affirmer are waived, abandoned, surrendered,
+licensed or otherwise affected by this document.
+
+b. Affirmer offers the Work as-is and makes no representations or warranties
+of any kind concerning the Work, express, implied, statutory or otherwise,
+including without limitation warranties of title, merchantability, fitness
+for a particular purpose, non infringement, or the absence of latent or other
+defects, accuracy, or the present or absence of errors, whether or not discoverable,
+all to the greatest extent permissible under applicable law.
+
+c. Affirmer disclaims responsibility for clearing rights of other persons
+that may apply to the Work or any use thereof, including without limitation
+any person's Copyright and Related Rights in the Work. Further, Affirmer disclaims
+responsibility for obtaining any necessary consents, permissions or other
+rights required for any use of the Work.
+
+d. Affirmer understands and acknowledges that Creative Commons is not a party
+to this document and has no duty or obligation with respect to this CC0 or
+use of the Work.
diff --git a/include/android/meson.build b/include/android/meson.build
index 69f1c38e..da2504f2 100644
--- a/include/android/meson.build
+++ b/include/android/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 android_includes = ([
     include_directories('hardware/libhardware/include/'),
     include_directories('metadata/'),
diff --git a/include/ipa/meson.build b/include/ipa/meson.build
index 695a4183..3d5c0dd6 100644
--- a/include/ipa/meson.build
+++ b/include/ipa/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_ipa_api = files([
     'ipa_controls.h',
     'ipa_interface.h',
diff --git a/include/libcamera/meson.build b/include/libcamera/meson.build
index 23c01d38..cea47eb8 100644
--- a/include/libcamera/meson.build
+++ b/include/libcamera/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_api = files([
     'bound_method.h',
     'buffer.h',
diff --git a/include/meson.build b/include/meson.build
index 42b24534..4f41c9ce 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_include_dir = 'libcamera'
 
 subdir('android')
diff --git a/meson.build b/meson.build
index 59829e19..e898782a 100644
--- a/meson.build
+++ b/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 project('libcamera', 'c', 'cpp',
     meson_version : '>= 0.47',
     version : '0.0.0',
diff --git a/meson_options.txt b/meson_options.txt
index 68f4f480..badace15 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 option('android',
         type : 'boolean',
         value : false,
diff --git a/src/android/meson.build b/src/android/meson.build
index 5a5a332e..822cad62 100644
--- a/src/android/meson.build
+++ b/src/android/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 android_hal_sources = files([
     'camera3_hal.cpp',
     'camera_hal_manager.cpp',
diff --git a/src/cam/meson.build b/src/cam/meson.build
index 162d6333..89e124fb 100644
--- a/src/cam/meson.build
+++ b/src/cam/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 cam_sources = files([
     'buffer_writer.cpp',
     'capture.cpp',
diff --git a/src/gstreamer/meson.build b/src/gstreamer/meson.build
index e119e472..c9f0c13d 100644
--- a/src/gstreamer/meson.build
+++ b/src/gstreamer/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_gst_sources = [
     'gstlibcamera-utils.cpp',
     'gstlibcamera.cpp',
diff --git a/src/ipa/libipa/meson.build b/src/ipa/libipa/meson.build
index 6f3cd486..22626405 100644
--- a/src/ipa/libipa/meson.build
+++ b/src/ipa/libipa/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libipa_headers = files([
     'ipa_interface_wrapper.h',
 ])
diff --git a/src/ipa/meson.build b/src/ipa/meson.build
index b103479c..64deb601 100644
--- a/src/ipa/meson.build
+++ b/src/ipa/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_install_dir = join_paths(get_option('libdir'), 'libcamera')
 ipa_data_dir = join_paths(get_option('datadir'), 'libcamera', 'ipa')
 ipa_sysconf_dir = join_paths(get_option('sysconfdir'), 'libcamera', 'ipa')
diff --git a/src/ipa/raspberrypi/meson.build b/src/ipa/raspberrypi/meson.build
index 2dece3a4..697902e9 100644
--- a/src/ipa/raspberrypi/meson.build
+++ b/src/ipa/raspberrypi/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_name = 'ipa_rpi'
 
 rpi_ipa_deps = [
diff --git a/src/ipa/rkisp1/meson.build b/src/ipa/rkisp1/meson.build
index d7127ea8..ed9a6b6b 100644
--- a/src/ipa/rkisp1/meson.build
+++ b/src/ipa/rkisp1/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_name = 'ipa_rkisp1'
 
 mod = shared_module(ipa_name,
diff --git a/src/ipa/vimc/data/meson.build b/src/ipa/vimc/data/meson.build
index c844926d..6532662c 100644
--- a/src/ipa/vimc/data/meson.build
+++ b/src/ipa/vimc/data/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 conf_files = files([
     'vimc.conf',
 ])
diff --git a/src/ipa/vimc/meson.build b/src/ipa/vimc/meson.build
index 22296a02..8c9df854 100644
--- a/src/ipa/vimc/meson.build
+++ b/src/ipa/vimc/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_name = 'ipa_vimc'
 
 mod = shared_module(ipa_name,
diff --git a/src/libcamera/include/meson.build b/src/libcamera/include/meson.build
index 683d0613..1f6af579 100644
--- a/src/libcamera/include/meson.build
+++ b/src/libcamera/include/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_headers = files([
     'byte_stream_buffer.h',
     'camera_controls.h',
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index d8b4d720..d42e9720 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources = files([
     'bound_method.cpp',
     'buffer.cpp',
diff --git a/src/libcamera/pipeline/ipu3/meson.build b/src/libcamera/pipeline/ipu3/meson.build
index 0ab766a2..0e8c5a14 100644
--- a/src/libcamera/pipeline/ipu3/meson.build
+++ b/src/libcamera/pipeline/ipu3/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'ipu3.cpp',
 ])
diff --git a/src/libcamera/pipeline/meson.build b/src/libcamera/pipeline/meson.build
index 190ca5a8..46424493 100644
--- a/src/libcamera/pipeline/meson.build
+++ b/src/libcamera/pipeline/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 foreach pipeline : get_option('pipelines')
     subdir(pipeline)
 endforeach
diff --git a/src/libcamera/pipeline/raspberrypi/meson.build b/src/libcamera/pipeline/raspberrypi/meson.build
index 73785797..fc117b77 100644
--- a/src/libcamera/pipeline/raspberrypi/meson.build
+++ b/src/libcamera/pipeline/raspberrypi/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'raspberrypi.cpp'
 ])
diff --git a/src/libcamera/pipeline/rkisp1/meson.build b/src/libcamera/pipeline/rkisp1/meson.build
index d04fb452..1ab3964a 100644
--- a/src/libcamera/pipeline/rkisp1/meson.build
+++ b/src/libcamera/pipeline/rkisp1/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'rkisp1.cpp',
     'timeline.cpp',
diff --git a/src/libcamera/pipeline/simple/meson.build b/src/libcamera/pipeline/simple/meson.build
index 8372f24e..9c99b32f 100644
--- a/src/libcamera/pipeline/simple/meson.build
+++ b/src/libcamera/pipeline/simple/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'converter.cpp',
     'simple.cpp',
diff --git a/src/libcamera/pipeline/uvcvideo/meson.build b/src/libcamera/pipeline/uvcvideo/meson.build
index c19ae238..a3c2efd4 100644
--- a/src/libcamera/pipeline/uvcvideo/meson.build
+++ b/src/libcamera/pipeline/uvcvideo/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'uvcvideo.cpp',
 ])
diff --git a/src/libcamera/pipeline/vimc/meson.build b/src/libcamera/pipeline/vimc/meson.build
index 615ecd20..290eefb5 100644
--- a/src/libcamera/pipeline/vimc/meson.build
+++ b/src/libcamera/pipeline/vimc/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'vimc.cpp',
 ])
diff --git a/src/libcamera/proxy/meson.build b/src/libcamera/proxy/meson.build
index 6c00d5f3..bd804750 100644
--- a/src/libcamera/proxy/meson.build
+++ b/src/libcamera/proxy/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libcamera_sources += files([
     'ipa_proxy_linux.cpp',
     'ipa_proxy_thread.cpp',
diff --git a/src/libcamera/proxy/worker/meson.build b/src/libcamera/proxy/worker/meson.build
index 839156f7..1b1bee5e 100644
--- a/src/libcamera/proxy/worker/meson.build
+++ b/src/libcamera/proxy/worker/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_proxy_sources = [
     ['ipa_proxy_linux', 'ipa_proxy_linux_worker.cpp']
 ]
diff --git a/src/meson.build b/src/meson.build
index c9c10085..d69b4c1e 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 if get_option('android')
     subdir('android')
 endif
diff --git a/src/qcam/meson.build b/src/qcam/meson.build
index 949ef614..045db52a 100644
--- a/src/qcam/meson.build
+++ b/src/qcam/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 qcam_sources = files([
     '../cam/options.cpp',
     '../cam/stream_options.cpp',
diff --git a/src/v4l2/meson.build b/src/v4l2/meson.build
index efab968f..fc1be82d 100644
--- a/src/v4l2/meson.build
+++ b/src/v4l2/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 v4l2_compat_sources = files([
     'v4l2_camera.cpp',
     'v4l2_camera_proxy.cpp',
diff --git a/test/camera/meson.build b/test/camera/meson.build
index e2a6660a..0395e7dd 100644
--- a/test/camera/meson.build
+++ b/test/camera/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 # Tests are listed in order of complexity.
 # They are not alphabetically sorted.
 camera_tests = [
diff --git a/test/controls/meson.build b/test/controls/meson.build
index 7fff2413..545fb03b 100644
--- a/test/controls/meson.build
+++ b/test/controls/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 control_tests = [
     [ 'control_info',               'control_info.cpp' ],
     [ 'control_info_map',           'control_info_map.cpp' ],
diff --git a/test/ipa/meson.build b/test/ipa/meson.build
index f925c50a..ba672f3f 100644
--- a/test/ipa/meson.build
+++ b/test/ipa/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipa_test = [
     ['ipa_module_test',     'ipa_module_test.cpp'],
     ['ipa_interface_test',  'ipa_interface_test.cpp'],
diff --git a/test/ipc/meson.build b/test/ipc/meson.build
index cc46b41c..650df1d6 100644
--- a/test/ipc/meson.build
+++ b/test/ipc/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipc_tests = [
     [ 'unixsocket',  'unixsocket.cpp' ],
 ]
diff --git a/test/libtest/meson.build b/test/libtest/meson.build
index 33565e0e..481f6d6b 100644
--- a/test/libtest/meson.build
+++ b/test/libtest/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 libtest_sources = files([
     'buffer_source.cpp',
     'camera_test.cpp',
diff --git a/test/log/meson.build b/test/log/meson.build
index 95f6c1a2..8cd664e0 100644
--- a/test/log/meson.build
+++ b/test/log/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 log_test = [
     ['log_api',     'log_api.cpp'],
     ['log_process', 'log_process.cpp'],
diff --git a/test/media_device/meson.build b/test/media_device/meson.build
index 6a0e4684..1dfcdd8b 100644
--- a/test/media_device/meson.build
+++ b/test/media_device/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 lib_mdev_test_sources = files([
     'media_device_test.cpp',
 ])
diff --git a/test/meson.build b/test/meson.build
index 5a45a85e..bd7da147 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 subdir('libtest')
 
 subdir('camera')
diff --git a/test/pipeline/ipu3/meson.build b/test/pipeline/ipu3/meson.build
index d02927c9..d062ecd2 100644
--- a/test/pipeline/ipu3/meson.build
+++ b/test/pipeline/ipu3/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipu3_test = [
     ['ipu3_pipeline_test',            'ipu3_pipeline_test.cpp'],
 ]
diff --git a/test/pipeline/meson.build b/test/pipeline/meson.build
index 157f789c..6e7901fe 100644
--- a/test/pipeline/meson.build
+++ b/test/pipeline/meson.build
@@ -1,2 +1,4 @@
+# SPDX-License-Identifier: CC0-1.0
+
 subdir('ipu3')
 subdir('rkisp1')
diff --git a/test/pipeline/rkisp1/meson.build b/test/pipeline/rkisp1/meson.build
index d3f97496..ece147b0 100644
--- a/test/pipeline/rkisp1/meson.build
+++ b/test/pipeline/rkisp1/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 rkisp1_test = [
     ['rkisp1_pipeline_test',            'rkisp1_pipeline_test.cpp'],
 ]
diff --git a/test/process/meson.build b/test/process/meson.build
index c4d83d6c..c215fa7e 100644
--- a/test/process/meson.build
+++ b/test/process/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 process_tests = [
     [ 'process_test',  'process_test.cpp' ],
 ]
diff --git a/test/serialization/meson.build b/test/serialization/meson.build
index d78d92e6..a9d9cbcb 100644
--- a/test/serialization/meson.build
+++ b/test/serialization/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 serialization_tests = [
     [ 'control_serialization',    'control_serialization.cpp' ],
 ]
diff --git a/test/stream/meson.build b/test/stream/meson.build
index 005f4aa4..2b9b29a9 100644
--- a/test/stream/meson.build
+++ b/test/stream/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 stream_tests = [
     [ 'stream_formats', 'stream_formats.cpp' ],
 ]
diff --git a/test/v4l2_subdevice/meson.build b/test/v4l2_subdevice/meson.build
index 0521984b..5f0882ca 100644
--- a/test/v4l2_subdevice/meson.build
+++ b/test/v4l2_subdevice/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 v4l2_subdevice_tests = [
   [ 'list_formats',             'list_formats.cpp'],
   [ 'test_formats',             'test_formats.cpp'],
diff --git a/test/v4l2_videodevice/meson.build b/test/v4l2_videodevice/meson.build
index 685fcf6d..b4bb3090 100644
--- a/test/v4l2_videodevice/meson.build
+++ b/test/v4l2_videodevice/meson.build
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: CC0-1.0
+
 # Tests are listed in order of complexity.
 # They are not alphabetically sorted.
 v4l2_videodevice_tests = [
diff --git a/utils/ipu3/meson.build b/utils/ipu3/meson.build
index 49c45856..88049f58 100644
--- a/utils/ipu3/meson.build
+++ b/utils/ipu3/meson.build
@@ -1 +1,3 @@
+# SPDX-License-Identifier: CC0-1.0
+
 ipu3_unpack = executable('ipu3-unpack', 'ipu3-unpack.c')
diff --git a/utils/meson.build b/utils/meson.build
index f434c79c..c3cd9d69 100644
--- a/utils/meson.build
+++ b/utils/meson.build
@@ -1 +1,3 @@
+# SPDX-License-Identifier: CC0-1.0
+
 subdir('ipu3')