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Merge pull request #3112 from fpistm/license
docs(license): clarify license scope and third-party attributions
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‎License.md‎

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[LGPLv2.1](#lgplv21) is used for:
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* `cores/arduino/*.*` mainly contains modified files from Arduino.
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* `cores/arduino/*.*` mainly contains modified files from Arduino, except the
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files listed under [BSD 3-Clause License](#bsd-3-clause-license) and
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[MIT License](#mit-license)
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* `cores/arduino/stm32`
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* `cores/arduino/api` (own copy of the license in `cores/arduino/api/LICENSE`),
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except the files listed under [MIT License](#mit-license)
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* `libraries/EEPROM`, `libraries/IWatchdog`, `libraries/Keyboard`,
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`libraries/Mouse`, `libraries/Servo`, `libraries/SoftwareSerial`,
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`libraries/SPI`, `libraries/Wire` - except the files listed under
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[BSD 3-Clause License](#bsd-3-clause-license)
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* `libraries/USBDevice/src/USBSerial.cpp` and `libraries/USBDevice/inc/USBSerial.h`
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[BSD 3-Clause License](#bsd-3-clause-license) is used for:
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* `system/Drivers/STM32*xx_HAL_Driver` folders include the STMicroelectronics HAL Drivers
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* `system/Middlewares/OpenAMP`
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* `libraries/VirtIO` - except virtio implementation (see [MIT License](#mit-license))
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* `libraries/SrcWrapper/inc/PinName*.h`
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* `cores/arduino/variant.h`, `cores/arduino/pins_arduino_analog.h` and
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`cores/arduino/pins_arduino_digital.h`
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* `libraries/EEPROM/src/utility/stm32_eeprom.*`
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* `libraries/Wire/src/utility/twi.*`
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* `libraries/USBDevice/src/cdc/cdc_queue.c` and `libraries/USBDevice/inc/cdc_queue.h`
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* `libraries/I3C`, `libraries/RGB_LED_TLC59731` and `libraries/SubGhz`
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* `libraries/SrcWrapper` - files with a BSD 3-Clause header, mainly
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`libraries/SrcWrapper/src/stm32` and `libraries/SrcWrapper/inc`
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* `variants` - files with a BSD 3-Clause header, such as `PeripheralPins.c`,
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`variant_generic.*` and `generic_clock.c`
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[Ultimate Liberty License](#Ultimate-Liberty-License) is used for:
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* `system/Middlewares/STM32_USB_*_Library` folders
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* `libraries/USBDevice` (see header)
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* `system/Middlewares/ST/STM32_USB_*_Library` folders
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* `libraries/USBDevice` - files with a SLA0044 header, see the
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[restrictions](#ultimate-liberty-license) of this license
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[Apache License](#apache-license) is used for:
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* `system/Drivers/CMSIS` folder includes the STMicroelectronics CMSIS device
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* `system/include/include/pinmap.h`
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* `libraries/SrcWrapper/inc/pinmap.h`
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* `libraries/SrcWrapper/src/stm32/pinmap.c`
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* `tools/platformio/platformio-build.py`
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[MIT License](#mit-license)
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* `libraries/VirtIO/*/virtio*`
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[MIT License](#mit-license) is used for:
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* `libraries/VirtIO/*/virtio*` and `libraries/VirtIO/*/VirtIOSerial.*`
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* `libraries/SrcWrapper/*/HardwareTimer.*`
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* `libraries/SrcWrapper/src/new.cpp`
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* `cores/arduino/api/Udp.h` and `cores/arduino/api/deprecated-avr-comp/avr/pgmspace.h`
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> [!NOTE]
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> `system/STM32*xx/system_stm32*xx.c` uses same license than `system/Drivers/CMSIS`
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> `system/STM32*xx/stm32*xx_hal_conf_default.h` uses same license than `system/Drivers` subfolders
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> [!NOTE]
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> Files under different licenses are separate files, each one keeps its own
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> license. Only the license of a file applies to that file: the LGPLv2.1 terms
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> do not extend to the files under other licenses and vice versa.
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> The Apache License 2.0 is compatible with LGPLv3 but not with LGPLv2.1 alone:
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> Apache licensed files must not be merged in an LGPLv2.1 licensed file.
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> [!NOTE]
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> `system/Middlewares/OpenAMP/*/scripts/spelling.txt` is a data file used by the
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> OpenAMP development scripts, licensed under GPLv2 (see its header). It is not
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> part of the build of the core.
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## Third-party components and attributions
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The following files are not written by STMicroelectronics or by the
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STM32duino contributors. The copyright notice and the permission notice of their
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header must be retained:
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| Files | Copyright | License |
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|-------|-----------|---------|
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| `libraries/SrcWrapper/src/new.cpp` | PJRC.COM, LLC (Teensyduino) | [MIT](#mit-license) |
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| `libraries/SrcWrapper/*/HardwareTimer.*` | Daniel Fekete (and STMicroelectronics) | [MIT](#mit-license) |
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| `libraries/VirtIO/*/virtio*`, `libraries/VirtIO/*/VirtIOSerial.*` | Bumsik Kim | [MIT](#mit-license) |
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| `cores/arduino/api/Udp.h` | Bjoern Hartmann | [MIT](#mit-license) |
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| `cores/arduino/api/deprecated-avr-comp/avr/pgmspace.h` | Arduino LLC (based on Paul Stoffregen's work) | [MIT](#mit-license) |
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| `cores/arduino/api` | Arduino LLC | [LGPLv2.1](#lgplv21) |
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| `system/Middlewares/OpenAMP/open-amp` | Mentor Graphics Corporation and contributors | [BSD 3-Clause License](#bsd-3-clause-license) |
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| `system/Middlewares/OpenAMP/libmetal` | Xilinx Inc. and contributors | [BSD 3-Clause License](#bsd-3-clause-license) |
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The following components are not part of this repository, they are downloaded
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as Arduino tools packages (see `platform.txt`) and are licensed by Arm under the
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[Apache License](#apache-license):
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* CMSIS (`CMSIS`)
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* CMSIS-DSP (`CMSIS_DSP`), also used by `libraries/CMSIS_DSP`
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* CMSIS-NN (`CMSIS_NN`)
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-------------------------------------------------------------------------------
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## LGPLv2.1
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GNU LESSER GENERAL PUBLIC LICENSE
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the License. You may obtain a copy of the License at:
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http://www.st.com/SLA0044
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> [!IMPORTANT]
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> SLA0044 is not an open source license. The full text is available in
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> `system/Middlewares/ST/STM32_USB_Device_Library/LICENSE.md`. Among others:
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>
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> * The software, including modifications and derivative works, must be used
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> and executed solely and exclusively on or in combination with a processing
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> unit device manufactured by or for STMicroelectronics.
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> * No use, reproduction or redistribution may be done in any manner that would
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> subject the software to any Open Source Terms (GPL, EPL, Apache, BSD, MIT
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> or any license requiring the distribution of the source code).
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> * The name of STMicroelectronics must not be used to endorse or promote
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> derived products without prior written permission.
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> * Redistribution and use outside the terms of the agreement is void.
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>
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> Redistributors must check these terms against their own distribution policy.
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> The files under this license are kept separate from the files under other
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> licenses of this repository.
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-------------------------------------------------------------------------------
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## Apache License
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Apache License

‎libraries/I3C/src/I3C.cpp‎

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/*
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*******************************************************************************
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* Copyright (c) 2026, STMicroelectronics
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* All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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*******************************************************************************
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*/
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#include "I3C.h"
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#include <cstring>
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‎libraries/I3C/src/I3C.h‎

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/*
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*******************************************************************************
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* Copyright (c) 2026, STMicroelectronics
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* All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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*******************************************************************************
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*/
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#pragma once
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#include "Arduino.h"

‎libraries/I3C/src/I3C_I2C.cpp‎

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/*
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*******************************************************************************
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* Copyright (c) 2026, STMicroelectronics
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* All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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*******************************************************************************
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*/
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#include "I3C.h"
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#include <cstring>
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