Update README.md

README.md

@@ -95,7 +95,11 @@ unzip test-clean.zip
 
 ## License
 
-This dataset is released under: [MIT License](https://opensource.org/licenses/MIT)
+The synthetic subset, whose text is sourced from CC-100 (MIT license), is released
+under CC BY 4.0. The handwritten and typed subsets use text from the amWaC
+corpus (CC BY-NC-SA 4.0); accordingly, the text transcriptions for these subsets are
+released under CC BY-NC-SA 4.0, while the original handwritten and scanned images
+are released under CC BY 4.0.
 
 ## Acknowledgments