Relicense dataset to CC BY-NC 4.0 (noncommercial)

README.md

@@ -1,5 +1,5 @@
 ---
-license: cc-by-4.0
+license: cc-by-nc-4.0
 task_categories:
 - robotics
 tags:
@@ -173,7 +173,9 @@ per-frame `training_data.json`.
 
 ## License
 
-Released under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Built on
+Released under [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/) — free for
+**noncommercial** use; commercial use requires a separate license (see the
+[code repo](https://github.com/TX-Leo/HumanEgo)). Built on
 [Project Aria](https://www.projectaria.com/) (Gen 1 glasses & MPS) — please also respect their
 terms of use.