Over the years while editing on Commons, I run several times into lock down pages that can't be edited. The issue is that after the page was created the website listed as the image source was added to the list of blocked sites by the spam filter as blacklisted external site. As a result unless someone delete valid source the image cannot be categorized or altered in any way. See for example https://commons.wikimedia.org/wiki/File:Masopust_dr%C5%BE%C3%ADme_14.jpg .
There were several discussions about it on Commons and I filed a bug report https://bugzilla.wikimedia.org/show_bug.cgi?id=55794 . But still the common practice is to somehow disable the link like in https://commons.wikimedia.org/w/index.php?title=File%3AMasopust_dr%C5%BE %C3%ADme_07.jpg&diff=107220155&oldid=102671143
Is there a better way to deal with such files?
Jarek T.
(user:jarekt http://commons.wikimedia.org/wiki/User:Jarekt )