72 lines
3.7 KiB
ReStructuredText
72 lines
3.7 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-4.0
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==========
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Licenses
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==========
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TL;DR summary: The libcamera core is covered by the LGPL-2.1-or-later license.
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IPA modules included in libcamera are covered by a free software license.
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Third-parties may develop IPA modules outside of libcamera and distribute them
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under a closed-source license, provided they do not include source code from
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the libcamera project.
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The libcamera project contains multiple libraries, applications and utilities.
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Licenses are expressed through SPDX tags in text-based files that support
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comments, and through the .reuse/dep5 file otherwise. A copy of all licenses is
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stored in the LICENSES directory.
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The following text summarizes the licenses covering the different components of
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the project to offer a quick overview for developers. The SPDX and DEP5
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information are however authoritative and shall prevail in case of
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inconsistencies with the text below.
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The libcamera core source code, located under the include/libcamera/ and
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src/libcamera/ directories, is fully covered by the LGPL-2.1-or-later license,
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which thus covers distribution of the libcamera.so binary. Other files located
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in those directories, most notably the meson build files, and various related
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build scripts, may be covered by different licenses. None of their source code
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is incorporated in the in the libcamera.so binary, they thus don't affect the
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distribution terms of the binary.
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The IPA modules, located in src/ipa/, are covered by free software licenses
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chosen by the module authors. The LGPL-2.1-or-later license is recommended.
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Those modules are compiled as separate binaries and dynamically loaded by the
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libcamera core at runtime.
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The IPA module API is defined in headers located in include/libcamera/ipa/ and
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covered by the LGPL-2.1-or-later license. Using the data types (including
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classes, structures and enumerations) and macros defined in the IPA module and
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libcamera core API headers in IPA modules doesn't extend the LGPL license to
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the IPA modules. Third-party closed-source IPA modules are thus permitted,
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provided they comply with the licensing requirements of any software they
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include or link to.
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The libcamera Android camera HAL component is located in src/android/. The
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libcamera-specific source code is covered by the LGPL-2.1-or-later license. The
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component additionally contains header files and source code, located
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respectively in include/android/ and src/android/metadata/, copied verbatim
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from Android and covered by the Apache-2.0 license.
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The libcamera GStreamer and V4L2 adaptation source code, located respectively
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in src/gstreamer/ and src/v4l2/, is fully covered by the LGPL-2.1-or-later
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license. Those components are compiled to separate binaries and do not
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influence the license of the libcamera core.
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The cam and qcam sample applications, as well as the unit tests, located
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respectively in src/cam/, src/qcam/ and test/, are covered by the
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GPL-2.0-or-later license. qcam additionally includes an icon set covered by the
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MIT license. Those applications are compiled to separate binaries and do not
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influence the license of the libcamera core.
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Additional utilities are located in the utils/ directory and are covered by
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various licenses. They are not part of the libcamera core and do not influence
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its license.
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Finally, copies of various Linux kernel headers are included in include/linux/
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to avoid depending on particular versions of those headers being installed in
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the system. The Linux kernel headers are covered by their respective license,
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including the Linux kernel license syscall exception. Using a copy of those
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headers doesn't affect libcamera licensing terms in any way compared to using
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the same headers installed in the system from kernel headers packages provided
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by Linux distributions.
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