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The user-contributed software (for instance the user scripts and the gadgets in the MediaWiki namespace) are by default contributed under [https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License CC-BY-SA]. This is due to [https://en.wikipedia.org/wiki/Wikipedia:Scripts#License Wikidata having that same license for its software] and the expectation that contributors will cut and paste freely from Wikipedia and Wikidata.
The user-contributed software (for instance the user scripts and the gadgets in the MediaWiki namespace) are by default contributed under [https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License CC-BY-SA]. This is due to [https://en.wikipedia.org/wiki/Wikipedia:Scripts#License Wikidata having that same license for its software] and the expectation that contributors will cut and paste freely from Wikipedia and Wikidata.
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Wikipedia and Wikidata encourage contributors to double license under the [https://en.wikipedia.org/wiki/GNU_General_Public_License GPL], and we do the same here.
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Wikipedia and Wikidata encourage contributors to double license original contribution under the [https://en.wikipedia.org/wiki/GNU_General_Public_License GPL], and we do the same here, on a per file basis.