NoLicenseWarning

shows a warning message when an user attempts to upload a file without selecting a license. By default, they can upload the file anyway by simply resending the form.
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You can configure whether the script should prevent users from uploading files without licenses or just let them know that selecting a license is strongly recommended (default) and which user groups won't be affected by this script. It's also possible to change the default warning and rejection messages.
=== Script settings ===
Script configuration is stored in the window.NoLicenseWarning object and following variables are available:
Variable 	Description 	Data type	Default value
forceLicense 	Whether a license should be forced or not. 	Boolean 	false
excludedGroups	List of user groups that aren't affected by script. You can check user groups available on your wiki by visiting .	Array 	['bureaucrat', 'sysop', 'content-moderator', 'bot']
Code below contains example configuration that you can use by adding to the MediaWiki:Common.js page on your wiki:
=== Custom messages ===
If you want to use different banner messages, add following code to the MediaWiki:Common.js page on your wiki:
== Other notes ==
* Users within global groups such as staff, wiki-specialist, etc. are never affected by this script. Local user groups exceptions can be configured in the excludedGroups array.
* It's possible for users to bypass this script by disabling JavaScript in their web browser or by using the ?usesitejs=0 URL parameter (?safemode=1 on UCP wikis). There's no technical solution available to prevent users from uploading unlicensed files with absolute effectiveness.