Update dataset license to CC BY-NC-ND 4.0

README.md

@@ -1,6 +1,6 @@
 ---
 pretty_name: DocCount
-license: cc-by-nc-4.0
+license: cc-by-nc-nd-4.0
 language:
 - en
 task_categories:
@@ -164,8 +164,9 @@ recommended.
 ## License
 
 DocCount uses ADOPD source images and is released under
-[CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/).
-It is intended for non-commercial research use.
+[CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/).
+It is intended for non-commercial research use. Redistribution must preserve
+the dataset without adaptations and provide appropriate attribution.
 
 ## Citation