Template:Check file on delete/sandbox

Warning! This file is used in a system message or is one of the most widely used images. Such high-risk images should be locally uploaded and protected here at the English Wikipedia. Don't delete this image, not even if it has a backup copy on Commons. (more about this)
Unfortunately this file is currently not protected.

This is the template sandbox page for Template:Check file on delete (diff).
See also the companion subpage for test cases.

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This template is used in system messages.
Changes to it can cause immediate changes to the Wikipedia user interface.
To avoid major disruption, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them.

This is the {{check file on delete}} template.

This template is normally only used by the system, it is called from MediaWiki:Confirmdeletetext and MediaWiki:Filedelete-intro. It displays a warning message when an admin tries to delete a protected file or a known high-risk file.

This template detects all four kinds of protection: edit, move, create and upload protection. It warns even if it is only semi-protection. It then displays a message as seen above this documentation box.

This template also checks against a list of images used in system messages and a list of the most widely used images. If a match is found it displays this message:

Warning! This file is used in a system message or is one of the most widely used images on the English Wikipedia. Such high-risk images should be locally uploaded and protected here. Don't delete this image, not even if it has a backup copy on Commons. (more about this)
Unfortunately this file is currently not protected.

If the file is not protected at all and is not a known high-risk image then this template produces no output.