diff --git a/src/MDConcLicenses.php b/src/MDConcLicenses.php
index c9ad0db..ee09a40 100644
--- a/src/MDConcLicenses.php
+++ b/src/MDConcLicenses.php
@@ -26,6 +26,7 @@ final class MDConcLicenses {
         "CC_BY_SA"  => "CC BY-SA",
         "CC-BY-SA"  => "CC BY-SA",
         "CC.BY-SA"  => "CC BY-SA",
+        "CC BY-SA 4.0"  => "CC BY-SA",
         "Namensnennung - Weitergabe unter gleichen Bedingungen 4.0 International (CC BY-SA 4.0)"  => "CC BY-SA",
 
         "CC BY_NC"  => "CC BY-NC",
@@ -52,6 +53,9 @@ final class MDConcLicenses {
         "Alle Rechte vorbehalten - Urhebererechtlich geschütztes Werk" => "RR-F",
         "IN COPYRIGHT" => "RR-P",
         "Rechtsstatus unbekannt" => "RR-P",
+        "none" => "RR-F",
+
+        'PDM 1.0' => 'Public Domain Mark',
     ];
 
 }