Update README.md

README.md

@@ -92,6 +92,10 @@ We construct WAON dataset through the following steps:
 <img src="waon-pipeline.svg" width="50%"/>
 </div>
 
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+## LICENSE
+This dataset is licensed under the Apache License 2.0 and governed by Japanese law. Its use is limited to “information analysis” as defined in Article 30-4 of the Japanese Copyright Act.
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 ## Citation
 
 ```bibtex