Looks like the feature was partially removed back in r10168. In any case, its long gone out of trunk now.
http://www.mediawiki.org/wiki/Extension:DublinCoreRdf and
http://www.mediawiki.org/wiki/Extension:CreativeCoreRdf as appropriate
* (bug 21107) Split error "customcssjsprotected" into separate messages for JS and CSS
+* Removed $wgCheckCopyrightUpload from DefaultSettings, since the relevant feature
+ was removed in about 1.5.
=== New features in 1.19 ===
* BREAKING CHANGE: action=watch / action=unwatch now requires a token.
/** Set this to true if you want detailed copyright information forms on Upload. */
$wgUseCopyrightUpload = false;
-/** Set this to false if you want to disable checking that detailed copyright
- * information values are not empty. */
-$wgCheckCopyrightUpload = true;
-
/**
* Set this to the number of authors that you want to be credited below an
* article text. Set it to zero to hide the attribution block, and a negative