So to be clear, if the file was clearly marked with a green border or something, then that would be a prompt for me to go look at it and attempt to substitute it.

I am not sure if current Mediawiki software can do such things. Perhaps an extension or a gadget could be created to detect fair-use copyrignt templates. Other than that I do not see any way to detect fair-use files. This is not a Mediawiki issue, and I am not sure if phabricator is an appropriate place for requesting this type of feature.

Done. @Jane023 You can add

mw.loader.load( 'https://sv.wikipedia.org/w/index.php?title=Anv%C3%A4ndare:Nirmos/MarkLocalImages.js&action=raw&ctype=text/javascript' );

to https://meta.wikimedia.org/wiki/Special:MyPage/global.js
This will add the HTML class gadget-marklocalimages to all images that are not from Wikimedia Commons, on every project. You can then style this class however you want on https://meta.wikimedia.org/wiki/Special:MyPage/global.css
Example:

.gadget-marklocalimages {
	border: 5px solid green !important;
}

In T236616#5609343, @Masumrezarock100 wrote:

I am not sure if current Mediawiki software can do such things. Perhaps an extension or a gadget could be created to detect fair-use copyrignt templates. Other than that I do not see any way to detect fair-use files. This is not a Mediawiki issue, and I am not sure if phabricator is an appropriate place for requesting this type of feature.

This is a technical feature request so yes, Phabricator is a good venue to record that

In T236616#5609386, @Nirmos wrote:

Done. @Jane023 You can add

mw.loader.load( 'https://sv.wikipedia.org/w/index.php?title=Anv%C3%A4ndare:Nirmos/MarkLocalImages.js&action=raw&ctype=text/javascript' );

to https://meta.wikimedia.org/wiki/Special:MyPage/global.js
This will add the HTML class gadget-marklocalimages to all images that are not from Wikimedia Commons, on every project. You can then style this class however you want on https://meta.wikimedia.org/wiki/Special:MyPage/global.css
Example:

.gadget-marklocalimages {
	border: 5px solid green;
}

This will mark all local image, not just the fair use images.

An approach could be to add a bit of LUA to the infobox template. This piece of LUA would take the image location and if it's local, load the wikitext for the image location, look for a certain pattern (for example the template Non-free use rationale) and modify the output if it's found. Rexxs, would this be something you could have a look at?

Wow this is brilliant! Thanks so much!

@Jane023 You'll need the " !important" part too in the CSS part. I updated my comment above, but you probably copied from Multichill's quote of my comment.

FileImporter automatically detects fair-use and incompatible licenses/copyrignt tags. I think we can make it similar.

I could certainly look at a Lua solution, but I must say that my preference will always be for a solution that works at the user level. Anything running in Lua would normally impact every reader, whereas I think this request is for the benefit of a small number of editors. In these sort of cases, the combination of a small piece of user-loaded JavaScript plus user CSS fits the bill exactly. If @Nirmos's code does the job requested, it would seem to be a better solution than anything I could cook up in Lua.

@Nirmos: Are you still looking into this? Asking as you are set as assignee and this task has been silent for six months. :)

How is this resolved exactly? The provided script marks all local images, not only the fair use ones, but also the free ones.

A gadget could fetch the imageinfo API data for all images and change the DOM based on that. Easy but will probably be a bit slow for pages with lots of images.

Adding the functionality to MediaWiki itself does not seem super hard either. Check PageImages\Hooks\LinksUpdateHookHandler::isImageFree() for prior art.