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 Dashboard tool and never linked into the firmware.

• Files:

  • scripts/dashboard/static/js/bootstrap-chop.js

  • scripts/dashboard/static/css/bootstrap-chop.css

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:

  • scripts/coccicheck

  • scripts/coccinelle/array_size.cocci

  • scripts/coccinelle/deref_null.cocci

  • scripts/coccinelle/deref_null.cocci

  • scripts/coccinelle/deref_null.cocci

  • scripts/coccinelle/mini_lock.cocci

  • scripts/coccinelle/mini_lock.cocci

  • scripts/coccinelle/mini_lock.cocci

  • scripts/coccinelle/noderef.cocci

  • scripts/coccinelle/noderef.cocci

  • scripts/coccinelle/returnvar.cocci

  • scripts/coccinelle/semicolon.cocci

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:

  • scripts/checkpatch.pl

  • scripts/checkstack.pl

  • scripts/spelling.txt

ENE KB1200_EVB Board OpenOCD Configuration

• Licensing: GPLv2 License

• Impact: This file is used by OpenOCD when programming and debugging the ENE KB1200_EVB board. It is never linked into the firmware.

• Files:

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

FUSE Interface Definition Header File

• Licensing: BSD-2-clause

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

• Files:

  • subsys/fs/fuse_client/fuse_abi.h

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 CONFIG_COVERAGE_GCOV is enabled.

• Files:

  • subsys/testsuite/coverage/coverage.h

Godot Documentation Theme Files

• Origin: Godot Engine documentation

• Licensing: CC-BY-3.0

• Impact: These files customize the Sphinx Read the Docs theme used to render the documentation and were used as a starting point for Zephyr’s own theme. They are never linked into a firmware.

• Files:

  • doc/_static/css/custom.css

  • doc/_static/css/dark.css

  • doc/_static/css/light.css

  • doc/_static/js/custom.js

noUiSlider Library

• Origin: noUiSlider (Léon Gersen and contributors)

• Licensing: MIT License

• Impact: These files are used in the documentation to provide the flash/RAM range sliders in the board catalog and are never linked into a firmware.

• Files:

  • doc/_extensions/zephyr/domain/static/js/nouislider.min.js

  • doc/_extensions/zephyr/domain/static/css/nouislider.min.css

OpenThread Spinel HDLC RCP Host Interface Files

• Origin: OpenThread

• Licensing: BSD-3-clause

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

• Files:

  • modules/openthread/platform/hdlc_interface.hpp

  • modules/openthread/platform/radio_spinel.cpp

  • modules/openthread/platform/hdlc_interface.cpp

Popper.js Library

• Origin: Popper.js (Federico Zivolo and contributors)

• Licensing: MIT License

• Impact: This file is used by Tippy.js to position tooltips in the documentation’s Doxygen tooltip extension and is never linked into a firmware.

• Files:

  • doc/_extensions/zephyr/doxytooltip/static/tippy/popper.min.js

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

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:

  • tests/benchmarks/thread_metric/thread_metric_readme.txt

  • tests/benchmarks/thread_metric/src/tm_api.h

  • tests/benchmarks/thread_metric/src/tm_basic_processing_test.c

  • tests/benchmarks/thread_metric/src/tm_cooperative_scheduling_test.c

  • tests/benchmarks/thread_metric/src/tm_interrupt_preemption_processing_test.c

  • tests/benchmarks/thread_metric/src/tm_interrupt_processing_test.c

  • tests/benchmarks/thread_metric/src/tm_memory_allocation_test.c

  • tests/benchmarks/thread_metric/src/tm_message_processing_test.c

  • tests/benchmarks/thread_metric/src/tm_porting_layer.h

  • tests/benchmarks/thread_metric/src/tm_porting_layer_zephyr.c

  • tests/benchmarks/thread_metric/src/tm_preemptive_scheduling_test.c

  • tests/benchmarks/thread_metric/src/tm_synchronization_processing_test.c

Tippy.js Library

• Origin: Tippy.js (atomiks)

• Licensing: MIT License

• Impact: This file is used by the documentation’s Doxygen tooltip extension to render tooltips and is never linked into a firmware.

• Files:

  • doc/_extensions/zephyr/doxytooltip/static/tippy/tippy-bundle.umd.min.js

WireGuard VPN Files

• Origin: wireguard-lwip

• Licensing: BSD-3-clause

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

• Files with BSD-3-clause license:

  • subsys/net/lib/wireguard/wg_crypto.c

  • subsys/net/lib/wireguard/crypto/crypto.h

  • subsys/net/lib/wireguard/crypto/crypto.c

  • subsys/net/lib/wireguard/crypto/refc/blake2s.h

  • subsys/net/lib/wireguard/crypto/refc/blake2s.c

  • subsys/net/lib/wireguard/crypto/refc/hchacha20.h

  • subsys/net/lib/wireguard/crypto/refc/hchacha20.c