diff --git a/README.md b/README.md
index 472e7c92..33ce8964 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,13 @@
-[![CC BY-NC-SA 3.0][cc-by-nc-sa-shield]][cc-by-nc-sa] [![Ahoy Dev Build][dev-action-badge]][dev-action-link]
+[![CC BY-NC-SA 4.0][cc-by-nc-sa-shield]][cc-by-nc-sa] [![Ahoy Dev Build][dev-action-badge]][dev-action-link]
 
 This work is licensed under a
-[Creative Commons Attribution-NonCommercial-ShareAlike 3.0 International License][cc-by-nc-sa].
+[Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].
 
-[![CC BY-NC-SA 3.0][cc-by-nc-sa-image]][cc-by-nc-sa]
+[![CC BY-NC-SA 4.0][cc-by-nc-sa-image]][cc-by-nc-sa]
 
-[cc-by-nc-sa]: https://creativecommons.org/licenses/by-nc-sa/3.0/de/
-[cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/3.0/88x31.png
-[cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%203.0-lightgrey.svg
+[cc-by-nc-sa]: https://creativecommons.org/licenses/by-nc-sa/4.0/de/
+[cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png
+[cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg
 
 [dev-action-badge]: https://github.com/lumapu/ahoy/actions/workflows/compile_development.yml/badge.svg
 [dev-action-link]: https://github.com/lumapu/ahoy/actions/workflows/compile_development.yml
diff --git a/scripts/gh-action-dev-build-flash.html b/scripts/gh-action-dev-build-flash.html
index b6566b27..ea6146db 100644
--- a/scripts/gh-action-dev-build-flash.html
+++ b/scripts/gh-action-dev-build-flash.html
@@ -10,6 +10,9 @@
             <title>Flash | AhoyDTU</title>
         </head>
         <main>
+            <div class="alert alert-secondary my-3" role="alert">
+                Ahoy ist unter <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/de/" target="_blank">CC-BY-NC-SA 4.0</a> lizensiert.
+            </div>
             <div class="container col-xxl-8 px-4 py-5">
                 <h3>Development Build (ESP8266 / ESP32)</h3>
                 <p class="lead">