At the bottom of each page on wikisource is written:

Content is available under CC BY-SA 3.0 unless otherwise noted.

So basically, works under a different free license should be simply come with a 
statement in the page that reproduce them.

So for the exposed goal of archiving communications, there is really no big 
deal. Problem might only arise if we try to mix different pages up. If CC is 
indeed forward compatible, then mixing 3.0 and 4.0 licensed works should make 
the result only available under 4.0. More subtle, but still not a blocker.


Le 6 octobre 2018 23:12:18 GMT+02:00, David Starner <> a 
écrit :
>On Sat, Oct 6, 2018 at 1:33 PM KuboF Hromoslav
>> The material is under CC BY 4.0 but Wikisource is using CC BY-SA 3.0.
>> the problem is the version number) The argument is, that CC licenses
>> "forward compatible" but not "retro compatible". So it is OK to put
>> 3.0 material into CC BY 4.0 repository, but not the opposite.
>> In the meantime I have found, that another Wikisources are collecting
>> materials under CC BY 4.0, like
>Note that Wikipedia uses many images under a variety of licenses,
>CC BY 4.0 and fair use. An entire Wikipedia is not covered under any
>license. Likewise, an entire Wikisource is not covered under a single
>is covered under the CC-BY-4.0 independently of any license the rest of
>Wikisource is covered by. It's mere aggregation, not making a

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