Update README.md

README.md

@@ -101,6 +101,9 @@ This dataset is licensed under the [AGPL-3.0 License](https://www.gnu.org/licens
 SPDX-License-Identifier: AGPL-3.0-or-later
 ```
 
+Note that the original dataset is licensed under [CC0](https://creativecommons.org/public-domain/cc0/) and is available through [FTP](http://ftp.ebi.ac.uk/pub/databases/RNAcentral/)
+
+
 ## Citation
 
 ```bibtex