diff --git a/index.js b/index.js
index ed69c73..cba85ff 100644
--- a/index.js
+++ b/index.js
@@ -5,6 +5,7 @@
       "level": "Intermediate",
       "desc": "description",
       "lang": "el",
+      "license": "CC BY-NC-ND 3.0",
       "dir": "hybrid-linux"
 },
 {
@@ -13,6 +14,7 @@
       "level": "Intermediate",
       "desc": "description",
       "lang": "en",
+      "license": "CC BY-NC-ND 3.0",
       "dir": "hybrid-linux-en"
 },
 {
@@ -20,6 +22,7 @@
       "subtitle": "Basics",
       "level": "Elementary",
       "desc": "description",
+      "license": "CC BY-NC-ND 3.0",
       "dir": "hybrid-mpi"
 }
 ]