diff --git a/src/MDConcLicenses.php b/src/MDConcLicenses.php
index cc583a9..c9ad0db 100644
--- a/src/MDConcLicenses.php
+++ b/src/MDConcLicenses.php
@@ -12,6 +12,8 @@ declare(strict_types = 1);
 final class MDConcLicenses {
 
     const LICENSES_LIST = [
+        "CC 0" => "CC0",
+        "CC_0" => "CC0",
         "https://creativecommons.org/publicdomain/zero/1.0/deed.de" => "CC0",
 
         "CC_BY" => "CC BY",
@@ -49,6 +51,7 @@ final class MDConcLicenses {
         "Alle Rechte vorbehalten" => "RR-F",
         "Alle Rechte vorbehalten - Urhebererechtlich geschütztes Werk" => "RR-F",
         "IN COPYRIGHT" => "RR-P",
+        "Rechtsstatus unbekannt" => "RR-P",
     ];
 
 }