The Quard Star Tutorial distribution includes both the tutorial and
various firmware files.  These are separate programs that are
distributed together for our users' convenience, and they have
separate licenses.

The following points clarify the license of the Quard Star Tutorial:

1) Because the project includes many other open source projects, so
the newly added codes of each part respect the original project 
license. See the specific licensing information in each source file.
The rest of the original code open source license is 
BSD-3-Clause License.

2) Documentation in the tutorial directory uses Attribution-ShareAlike 
4.0 International (CC BY-SA 4.0).

Copyright (C) 2021 Quard <2014500726@smail.xtu.edu.cn>