Declare CC BY 4.0 dataset license in README

README.md

@@ -1,4 +1,5 @@
 ---
+license: cc-by-4.0
 pretty_name: RealCADBench-V1.0
 configs:
 - config_name: all
@@ -73,6 +74,8 @@ The release contains only files referenced by these mappings. Transfer archives,
 
 ## License
 
-A dataset license has not yet been specified by the dataset owner. No license grant is asserted by this generated dataset card.
+RealCADBench-V1.0 is licensed under the [Creative Commons Attribution 4.0 International (CC BY 4.0) License](https://creativecommons.org/licenses/by/4.0/).
+
+You may share and adapt the dataset, including for commercial purposes, provided that you give appropriate credit, provide a link to the license, and indicate if changes were made. See the [full license terms](https://creativecommons.org/licenses/by/4.0/legalcode).
 
 Remaining augmentation assets are stored under `part/input/real_pic_aug_extra/package_XXX/` and `part/ground_truth/real_pic_aug_extra/package_XXX/`. The metadata and Parquet paths include this layout; previously published asset paths are retained.