On Thu, Dec 4, 2014 at 1:49 PM, Daniel Kinzler <dan...@brightbyte.de> wrote:
> This is happening automatically: the SHA1 hash of every file is computed on > upload, and placed in the img_sha1 field on the database. I believe this > is used > to warn users who try to upload an exact duplicate, but I'm not sure this > is > true. Indeed; so chances are exact duplicates have been uploaded intentionally. (It's not certain because they might have been uploaded before this warning existed, or uploaded by a bot configured to ignore warnings.) There is also an automated report: https://commons.wikimedia.org/wiki/Special:ListDuplicatedFiles
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