docs: 许可协议 CC BY 4.0 → CC BY-NC 4.0（非商业，保留署名）

- LICENSE 重写为 CC BY-NC 4.0，显式声明不授权任何商业用途，如需商业授权请联系作者

- README badge/头部/引用/许可协议段同步更新为 BY-NC

- 许可协议段补充：欢迎所有以学习与研究为目的的下载、传播与内容改造；内容侵权或事实性错误请通过 Issue 反馈

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Michael-Jetson

LICENSE

@@ -1,14 +1,15 @@
-Creative Commons Attribution 4.0 International License
+Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)
 
 Copyright (c) 2026 Pengfei Guo (DAMIAO Technology)
 
 You are free to:
 
-  Share — copy and redistribute the material in any medium or format
-  for any purpose, including commercially.
+  Share — copy and redistribute the material in any medium or format.
 
-  Adapt — remix, transform, and build upon the material for any
-  purpose, including commercially.
+  Adapt — remix, transform, and build upon the material.
+
+The licensor cannot revoke these freedoms as long as you follow the
+license terms.
 
 Under the following terms:
 
@@ -17,9 +18,16 @@ Under the following terms:
   any reasonable manner, but not in any way that suggests the licensor
   endorses you or your use.
 
+  NonCommercial — You may not use the material for commercial purposes.
+
   No additional restrictions — You may not apply legal terms or
   technological measures that legally restrict others from doing
   anything the license permits.
 
+This license is intended to keep the material freely available for
+research and educational (non-commercial) use, with attribution.
+Commercial use is not granted under this license; for commercial
+licensing please contact the author.
+
 Full license text:
-https://creativecommons.org/licenses/by/4.0/legalcode
+https://creativecommons.org/licenses/by-nc/4.0/legalcode

README.md

@@ -1,14 +1,14 @@
 # Robotics Tutorial
 
-[![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)
+[![License: CC BY-NC 4.0](https://img.shields.io/badge/License-CC%20BY--NC%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nc/4.0/)
 
 面向机器人与人工智能交叉方向的系统化教学文档，覆盖从数学基础到具身智能的完整知识体系。
 
 > **声明：** 本项目大量使用 AI（Claude、Codex 等）结合互联网调研来撰写内容。尽管所有文档均经过多轮独立审核与事实核查，但仍然无法完全避免错误。如果您在阅读过程中发现任何事实性错误、论文引用偏差或技术描述不当，欢迎通过 [Issue](https://github.com/Michael-Jetson/Robotics_Tutorial/issues) 反馈，我们会及时修正。
 
 **Author:** Pengfei Guo  
 **Affiliation:** 达妙科技 (DAMIAO Technology)  
-**License:** [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) — 自由使用与商用，需注明出处  
+**License:** [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/) — 非商业用途（学习与研究）自由使用，需注明出处，不授权商业用途  
 **AI Collaboration:** 内容由 Claude 与 Codex 辅助编写，经多轮双盲审核与基于互联网调研的事实核查
 
 ---
@@ -93,19 +93,22 @@ git clone https://github.com/Michael-Jetson/Robotics_Tutorial.git
 ```
 Robotics Tutorial by Pengfei Guo, DAMIAO Technology
 https://github.com/Michael-Jetson/Robotics_Tutorial
-Licensed under CC BY 4.0
+Licensed under CC BY-NC 4.0
 ```
 
 ## 许可协议
 
-本项目采用 [CC BY 4.0 国际许可协议](https://creativecommons.org/licenses/by/4.0/)。
+本项目采用 [CC BY-NC 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc/4.0/)。
 
-你可以自由地：
-- **分享** — 以任何媒介或格式复制、转载
-- **改编** — 以任何目的（包括商业目的）进行混合、转换、再创作
+**欢迎所有以学习与研究为目的的下载、传播与内容改造。** 你可以自由地：
+- **分享** — 以任何媒介或格式复制、转载本材料
+- **改编** — 对本材料进行混合、转换与再创作
 
 但须遵守以下条件：
 - **署名** — 必须注明出处、提供许可协议链接，并说明是否进行了修改。
+- **非商业性使用** — 不得将本材料用于商业目的；本项目不授权任何商业用途，如需商业授权请联系作者。
+
+> **侵权与纠错：** 如发现任何内容侵权（图片、文字、论文引用等）或事实性错误，请及时通过 [Issue](https://github.com/Michael-Jetson/Robotics_Tutorial/issues) 反馈，我们会尽快处理与修正。
 
 ## Star History