Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19439
I'm not sure if to reuse the images from Wikimedia Commons is completely
safe.
Quoted from
https://commons.wikimedia.org/wiki/Commons:Reusing_content_outside_Wikimedia:
* Content under open content licenses may be reused without any need to
contact the licensor(s), but just keep in mind that:
* some licenses require that the original creator be attributed;
* some licenses require that the specific license be identified when
reusing (including, in some cases, stating or linking to the terms of the
license);
* some licenses require that if you modify the work, your
modifications must also be similarly freely licensed; and finally.
* Content in the public domain may not have a strict legal requirement of
attribution (depending on the jurisdiction of content reuse), but attribution
is recommended to give correct provenance.
So maybe some license still require attribution or identification of
license.
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