Manual:$wgCopyrightIcon/ja

詳細
これに HTML を設定して、権利アイコンを任意のロゴでオーバーライドします. This is the logo in the bottom left of the footer opposite the MediaWiki logo if using the Monobook skin.

例:

廃止予定と除去
This setting has been deprecated in 1.17 and has been removed in MediaWiki 1.27. ['copyright']['copyright'] should be used instead.