Update README.md

README.md

@@ -5,6 +5,7 @@ Official statistics on population in US (Census) and Europe (EUROSTAT).
 
 [![GitLab License](https://img.shields.io/gitlab/license/fact%2Fdata%2FFACT_population?gitlab_url=https%3A%2F%2Fgit.nilu.no&style=flat&color=orange)](https://www.gnu.org/licenses/agpl-3.0.en.html#license-text)
 [![DOI](https://img.shields.io/badge/DOI-10.17605%2FOSF.IO%2F8A3DR-blue?style=flat)](https://doi.org/10.17605/OSF.IO/8A3DR)
+[![Data License](https://img.shields.io/badge/data-CC%20BY%204.0-green)](https://creativecommons.org/licenses/by/4.0/legalcode.txt)
 
 ---
 
@@ -206,6 +207,9 @@ Riccardo Boero - ribo@nilu.no
 All the code and the resulting docker images in this project are subject to:
 - [![AGPL v3](https://www.gnu.org/graphics/agplv3-88x31.png "License Icon")](https://www.gnu.org/licenses/agpl-3.0.en.html#license-text)
 
+The data is released under: 
+- [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) license.
+
 The input data is subject to:
 - [Eurostat data](https://ec.europa.eu/eurostat/about-us/policies/copyright)
 - [Census Terms of Service](https://www.census.gov/data/developers/about/terms-of-service.html) This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.