New: have detailed copyright at bottom

Author: andreas-zeller

_config.yml

@@ -1,6 +1,6 @@
 title: The Debugging Book
 author: Andreas Zeller
-copyright: 2021-2025 CISPA Helmholtz Center for Information Security (www.cispa.de). All Rights Reserved
+copyright: 2021-2025 CISPA Helmholtz Center for Information Security (www.cispa.de). The content of this project is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The source code that is part of the content, as well as the source code used to format and display that content is licensed under the MIT License.
 logo: "_static/debuggingbook.png"
 
 bibtex_bibfiles:
@@ -40,6 +40,14 @@ html:
   announcement: '<p>This is a beta version of debuggingbook.org, currently in development. See the <a href="https://debuggingbook.org/classic/"  style="color:white!important;">classic site</a> for resources.</p>'
   use_issues_button: true
   use_repository_button: true
+  extra_footer: |
+    <div>
+      Copyright &copy; 2021–2025 <a href="https://www.cispa.de/">CISPA Helmholtz Center for Information Security</a>. The content of this project is licensed under the <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>. The source code that is part of the content, as well as the source code used to format and display that content is licensed under the <a href="https://github.com/uds-se/debuggingbook/blob/master/LICENSE.md#mit-license">MIT License</a>. <a href="https://cispa.de/en/impressum">Imprint</a>.
+    </div>
+    
+sphinx:
+  config:
+    html_show_copyright: false
 
 repository:
   url: "https://github.com/uds-se/debuggingbook/"