This SDK contains some software subject to open source licenses. In this document, we will introduce you to the terms that
apply to these open source software components and indicate where you can find these license.

1. \Middlewares\LwIP\
LwIP is freely available under a BSD-3 license.The source code is derived from "http://download.savannah.nongnu.org/releases/lwip/".

2. \Middlewares\FreeRTOS\FreeRTOS_v202012.00\
FreeRTOS is freely available under a MIT license.The source code is derived from "https://freertos.org/".
You can find the license at this directory path.

3. \Middlewares\RTThread\rtthread-nano-master\
RT-Thread 3.1.5 is freely available under a Apache License 2.0.The source code is derived from "https://www.rt-thread.org/download.html#download-rt-thread-nano". You can find the license at this directory path.

4. \Middlewares\FatFs\
FatFs is freely available under FatFs License. You can find the license at this directory path.

5. \Libraries\APM32F4xx_DAL_Driver\
APM32F4xx_DAL_Driver is freely available under a BSD-3 license. You can find the license at this directory path.

6. \Libraries\Device\Geehy\APM32F4xx\
APM32F4xx is freely available under a Apache-2.0 license. You can find the license at this directory path.

7. \Middlewares\CMSIS-FreeRTOS\
FreeRTOS is freely available under a MIT license.The source code is derived from "https://freertos.org/".
You can find the license at this directory path.

You can also access the applicable open source software terms and related statements at the following URL.
Apache License : https://opensource.org/license/apache-2-0/
MIT License : https://opensource.org/license/mit/
BSD License : https://opensource.org/license/bsd-3-clause/