Removing the publicly-viewable copyright
To remove the publicly-viewable copyright from the Guardian templates, follow these steps:
Log in to the admin script.
Choose the "Manage Templates" link and choose the "template.txt" template.
The template includes the string
%copyright%in the header. Delete that variable.
Choose "Save Data". The copyright string has now disappeared!
These steps above will remove the copyright string from the template pages that visitors see. To remove the copyright in the header of the admin script, you will have to customize "ag-admin" itself.
"Removing the publicly-viewable copyright" https://www.xav.com/scripts/guardian/help/1067.html