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Licensing of Zephyr Project components

doc/LICENSING.rst

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.. _zephyr_licensing:

Licensing of Zephyr Project components ######################################

The Zephyr kernel tree imports or reuses packages, scripts and other files that are not covered by the Apache 2.0 License_. In some places there is no LICENSE file or way to put a LICENSE file there, so we describe the licensing in this document.

Bootstrap JavaScript and CSS Files

  • Origin: Bootstrap

  • Licensing: MIT License_

  • Impact: These files are used in the :ref:dashboard tool and never linked into the firmware.

  • Files:

    • :zephyr_file:scripts/dashboard/static/js/bootstrap-chop.js
    • :zephyr_file:scripts/dashboard/static/css/bootstrap-chop.css

Continuous Integration Scripts

  • Origin: Linux Kernel

  • Licensing: GPLv2 License_

  • Impact: These files are used in Continuous Integration (CI) and never linked into the firmware.

  • Files:

    • :zephyr_file:scripts/checkpatch.pl
    • :zephyr_file:scripts/checkstack.pl
    • :zephyr_file:scripts/spelling.txt

Coccinelle Scripts

  • Origin: Coccinelle

  • Licensing: GPLv2 License_

  • Impact: These files are used by Coccinelle_, a tool for transforming C-code, and never linked into the firmware.

  • Files:

    • :zephyr_file:scripts/coccicheck
    • :zephyr_file:scripts/coccinelle/array_size.cocci
    • :zephyr_file:scripts/coccinelle/deref_null.cocci
    • :zephyr_file:scripts/coccinelle/deref_null.cocci
    • :zephyr_file:scripts/coccinelle/deref_null.cocci
    • :zephyr_file:scripts/coccinelle/mini_lock.cocci
    • :zephyr_file:scripts/coccinelle/mini_lock.cocci
    • :zephyr_file:scripts/coccinelle/mini_lock.cocci
    • :zephyr_file:scripts/coccinelle/noderef.cocci
    • :zephyr_file:scripts/coccinelle/noderef.cocci
    • :zephyr_file:scripts/coccinelle/returnvar.cocci
    • :zephyr_file:scripts/coccinelle/semicolon.cocci

GCOV Coverage Header File

  • Origin: GCC, the GNU Compiler Collection

  • Licensing: GPLv2 License_ with Runtime Library Exception

  • Impact: This file is only linked into the firmware if :kconfig:option:CONFIG_COVERAGE_GCOV is enabled.

  • Files:

    • :zephyr_file:subsys/testsuite/coverage/coverage.h

ENE KB1200_EVB Board OpenOCD Configuration

  • Licensing: GPLv2 License_

  • Impact: This file is used by OpenOCD_ when programming and debugging the :zephyr:board:kb1200_evb board. It is never linked into the firmware.

  • Files:

    • :zephyr_file:boards/ene/kb1200_evb/support/openocd.cfg

Thread-Metric RTOS Test Suite Source Files

  • Origin: ThreadX

  • Licensing: MIT License_

  • Impact: These files are only linked into the Thread-Metric RTOS Test Suite test firmware.

  • Files:

    • :zephyr_file:tests/benchmarks/thread_metric/thread_metric_readme.txt
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_api.h
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_basic_processing_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_cooperative_scheduling_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_interrupt_preemption_processing_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_interrupt_processing_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_memory_allocation_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_message_processing_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_porting_layer.h
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_porting_layer_zephyr.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_preemptive_scheduling_test.c
    • :zephyr_file:tests/benchmarks/thread_metric/src/tm_synchronization_processing_test.c

OpenThread Spinel HDLC RCP Host Interface Files

  • Origin: OpenThread

  • Licensing: BSD-3-clause_

  • Impact: These files are only linked into the firmware if :kconfig:option:CONFIG_HDLC_RCP_IF is enabled.

  • Files:

    • :zephyr_file:modules/openthread/platform/hdlc_interface.hpp
    • :zephyr_file:modules/openthread/platform/radio_spinel.cpp
    • :zephyr_file:modules/openthread/platform/hdlc_interface.cpp

Python Devicetree library test files

  • Licensing: BSD-3-clause_

  • Impact: These are only used for testing and never linked with the firmware.

  • Files:

    • Various yaml files under scripts/dts/python-devicetree/tests

FUSE Interface Definition Header File

  • Licensing: BSD-2-clause_

  • Impact: This header is used in Zephyr build only if :kconfig:option:CONFIG_FUSE_CLIENT is enabled.

  • Files:

    • :zephyr_file:subsys/fs/fuse_client/fuse_abi.h

WireGuard VPN Files

  • Origin: wireguard-lwip

  • Licensing: BSD-3-clause_

  • Impact: These files are only linked into the firmware if :kconfig:option:CONFIG_WIREGUARD is enabled.

  • Files with BSD-3-clause license:

    • :zephyr_file:subsys/net/lib/wireguard/wg_crypto.c
    • :zephyr_file:subsys/net/lib/wireguard/crypto/crypto.h
    • :zephyr_file:subsys/net/lib/wireguard/crypto/crypto.c
    • :zephyr_file:subsys/net/lib/wireguard/crypto/refc/blake2s.h
    • :zephyr_file:subsys/net/lib/wireguard/crypto/refc/blake2s.c
    • :zephyr_file:subsys/net/lib/wireguard/crypto/refc/hchacha20.h
    • :zephyr_file:subsys/net/lib/wireguard/crypto/refc/hchacha20.c

.. _Apache 2.0 License: https://github.com/zephyrproject-rtos/zephyr/blob/main/LICENSE

.. _GPLv2 License: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/COPYING

.. _MIT License: https://opensource.org/licenses/MIT

.. _BSD-3-clause: https://opensource.org/license/bsd-3-clause

.. _BSD-2-clause: https://opensource.org/license/bsd-2-clause

.. _Coccinelle: https://coccinelle.gitlabpages.inria.fr/website/

.. _OpenOCD: https://openocd.org