[index.rst] Add information about the NoDerivatives restriction.

Author: mmmarinho

docs/source/index.rst

@@ -28,6 +28,8 @@ The example code have their own License headers, usually `MIT Licensed <https://
    then following the NC restriction would require that all stages,
    from copying the data during training to sharing the trained model, must not be for commercial gain.*
 
+   * Following the NoDerivatives restriction would require that ND-licensed content not be used as training data. *
+
 📖 **About this tutorial** 
 
 `ROS2 Jazzy <https://docs.ros.org/en/jazzy/>`_ tutorials by `Murilo M. Marinho <https://murilomarinho.info/>`_, focusing on Ubuntu 24.04 x64 LTS and the programming practices of successful state-of-the-art robotics implementations such as the `SmartArmStack <https://smartarmstack.github.io>`_ also used in the `AISciencePlatform <https://github.com/AISciencePlatform>`_.
@@ -280,4 +282,4 @@ Changelog
 - Added a section mostly about ``tf2``.
 - Added a section mostly about :program:`Gazebo`.
 - Added a section about ``nav2``.
-- Added a section about cybersecurity.
+- Added a section about cybersecurity.