diff --git a/kos.yaml b/kos.yaml
index afb9ee7..ef438ab 100644
--- a/kos.yaml
+++ b/kos.yaml
@@ -401,7 +401,9 @@ msc:
   - http://w3id.org/nkos/nkostype#classification_schema
   notation:
   - MSC
-  notationPattern: '[0-9]{2}(-?[A-Z]*[0-9]*)?'
+  notationPattern: '[0-9]{2}(-XX|-[0-9]{2}|[A-Z](xx|[0-9]{2}))'
+  license:
+  - uri: http://creativecommons.org/licenses/by-nc/3.0/
   MARCSPEC: 080{$2=MSC}
 
 skb: