Given that File:Adobe PDF icon.png was forced to be deleted from commons per https://commons.wikimedia.org/wiki/Commons:Deletion_requests/Files_in_Category:PDF_icons the logo (icon used on all WMF wikis) are not free, and trademarked. Instead we shoud use another icon, such as a red squeare with the letters PDF in them.
|Open||None||T87268 Copyright license and attribution issues (tracking)|
|Invalid||None||T98463 Change English Wikipedia's PDF-icons for external links|
That icon is custom to the English Wikipedia, defined here: https://en.wikipedia.org/wiki/MediaWiki:Common.css (search for "PDF"). It uses the following icon: https://commons.wikimedia.org/wiki/File:Icons-mini-file_acrobat.gif (copying here for posterity, as it will no doubt be swiftly deleted now that I pointed it out: , original source).
MediaWiki uses a neutral icon:(resources/src/mediawiki.skinning/images/document-ltr.png).
Why does this need legal or design input in your opinion? Please clarify what you want to achieve. External link icons were removed from MediaWiki and several Wikimedia sites by T56604 and T65725, which seem unlikely to be reversed at this point.
Given that File:Adobe PDF icon.png was forced to be deleted
Forced? By whom?
We already have a "standard" 100 % free icon: https://commons.wikimedia.org/wiki/File:Pdfreaders-f.svg
I have redirected the old titles to the FSFE icon to unbreak incoming links. What is still using those files?