Update README.md

README.md

@@ -41,7 +41,8 @@ and direct observational data.
 
 - **Developed by:** ECMWF
 - **Model type:** Encoder-processor-decoder model
-- **License:** CC BY-SA 4.0
+- **License:** These model weights are published under a Creative Commons Attribution 4.0 International (CC BY 4.0).
+To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/
 
 ### Model Sources