Week 11 Wikimedia Commons: What It Is and How It Works

Summary

This week I read through the Commons:FAQ page on Wikimedia Commons, which is basically a repository of freely licensed media — images, audio, video, and so on — that anyone can use for any Wikimedia project or even outside of it. The key rule is that any freely licensed media file that is useful for any Wikimedia project can be uploaded, and the licenses must allow for commercial use and the creation of derivative works. That's actually a stricter standard than I expected. It doesn't just mean "free to look at" — it has to be free enough that someone could, say, use it in a commercial product. Commons does not accept fair use justifications, and media licensed exclusively under non-commercial-only licenses like CC BY-NC-SA are also not accepted. So it's a pretty high bar. The FAQ also covers practical things like what happens when you upload something and later want to take it down — which, it turns out, is generally not possible once the file has been on Commons for a week or more, since free licenses can't be revoked after the fact.

What I Found Interesting

The thing that surprised me most was how seriously Commons takes the "free for any purpose" requirement. I always assumed that putting something online for people to use freely was enough, but apparently labeling something "non-commercial only" actually disqualifies it from Commons entirely. Most images found on the internet can't be uploaded unless the copyright owner explicitly allowed publication under a free license. That's something I genuinely hadn't thought about before. I also found it interesting that files uploaded to Wikimedia Commons should be free of copyright restrictions both in the country of origin and in the United States — so you need to satisfy copyright law in two jurisdictions, not just one. That dual requirement must create some complicated situations for international contributors.

Question / Discussion Point

My main question is about who actually enforces all of this. The FAQ explains the rules clearly enough, but Commons is a volunteer-driven platform. If someone uploads an image and claims it's freely licensed when it isn't, how quickly does that get caught? The Wikimedia Foundation does not provide any warranty regarding the copyright status or correctness of licensing terms, which means the burden of verification falls largely on the community and ultimately on re-users. This feels like a structural weakness — the system depends heavily on good faith from uploaders, but bad-faith or simply mistaken uploads could circulate for a long time before anyone flags them. I'd be curious to discuss how Commons actually handles this in practice, and whether there are any systematic checks beyond volunteer review.

— [호류영 / Ho Ryuyeong]