Re: How is Wikidata CC0?

The Cunctator, 18/06/2018 17:57:
> Is there a coherent explanation of what content Wikidata is extracting from
> CC-BY-SA projects?

Not really, because it's a very distributed and long-running process 
(which is very very far from completion). But there are some relevant 
examples explained in some publications.
https://eprints.soton.ac.uk/412922/1/opensym_wd_vs_wp_2_.pdf
https://eprints.soton.ac.uk/413433/1/Open_Sym_Short_Paper_Wikidata_Multilingual.pdf
http://oadoi.org/10.1145/2872427.2874809

> Your claims that the abusive destruction of copyleft by the Wikidata
> project have nothing to do with copyright and nothing to do with Wikidata
> don't make any sense.
By "abusive destruction of copyleft" do you mean the practice of 
mirroring Wikipedia articles, or snippets thereof, without really 
complying with the copyleft licenses?

The first large scale example (which went way beyond the usual rogue 
mirrors) was probably Facebook with "community pages" in 2010.
<https://lists.wikimedia.org/pipermail/wikimedia-l/2010-April/104232.html>

At the time, the Wikimedia Foundation attempted to get them include a 
visible reference to CC-BY-SA, links from which the history and edit 
buttons would be visible, and so on. Some considered the result 
acceptable, some didn't. But many said there was no way to enforce 
something else.

Free riders are a common and well-studied issue of copyleft projects. 
The countermeasure is generally some kind of copyleft compliance 
syndicate, like
https://sfconservancy.org/copyleft-compliance/principles.html

Federico

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