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I don't know if relevant for Wikipedia, but in CC BY-SA 3.0 where the entire licence was invalidated if you made a mistake with the attribution.

I was reading of an exploit where an organisation is publishing photos under the 3.0 licence, searching for minor infractions and then extorting random bloggers and businesses for infringement. I believe the 4.0 licence addresses this by allowing users to fix a faulty attribution within a reasonable time.

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Yeah it's called copyright trolling because of how similar it is to patent trolling. Version 3.0 of the license isn't usually the favored version though since iirc it did include some mitigations on what's allowed for the whole attribution thing.

The one that's usually preferred is version 2.0, which has some fairly specific attribution requirements that are easy to mess up.

I wasted a few hundred issues on those trolls. I wrote about it here: https://allaboutberlin.com/guides/abmahnung-creative-commons

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