diff --git a/src/MDConcLicenses.php b/src/MDConcLicenses.php
index 3da5f99..8762203 100644
--- a/src/MDConcLicenses.php
+++ b/src/MDConcLicenses.php
@@ -35,6 +35,12 @@ final class MDConcLicenses {
         "CC-BY-NC-SA" => "CC BY-NC-SA",
         "CC.BY-NC-SA" => "CC BY-NC-SA",
 
+        "CC BY_NC_ND" => "CC BY-NC-ND",
+        "CC_BY_NC_ND" => "CC BY-NC-ND",
+        "CC-BY-NC-ND" => "CC BY-NC-ND",
+        "CC.BY-NC-ND" => "CC BY-NC-ND",
+        "https://creativecommons.org/licenses/by-nc-nd/4.0/" => "CC BY-NC-ND",
+
         "https://www.deutsche-digitale-bibliothek.de/content/lizenzen/rv-fz" => "RR-F",
         "https://www.europeana.eu/rights/rr-f/" => "RR-F",
         "Rechte vorbehalten - Freier Zugang" => "RR-F",