no it hasnt, As of at least Dec 1, 2009 it was not active. It was enabled for a short period just before that due to an error. Werdna disabled it due to problems and it was only recently enabled. mediawiki has supported general protection (and thus preventing upload) via the "edit" protection method. the recent addition that I am referring to is the "upload" permission that was added.
John
On Thu, Apr 15, 2010 at 7:22 PM, K. Peachey p858snake@yahoo.com.au wrote:
Commons, just like all the other WMF mediawiki installations has supported protecting files for ages.
-Peachey
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