One thing to point out is that:

1) Even right now, under the GPL, if extensions do qualify as “derivative 
works” or w/e, they do have to be GPL licensed.
2) Source code only has to be provided to users of the program. So presuming 
this is some private wiki with a secret extension, source code does not have to 
be provided or published to the general public.

-- 
Tyler Romeo
0x405D34A7C86B42DF

On February 7, 2015 at 18:49:29, David Gerard (dger...@gmail.com) wrote:

On 7 February 2015 at 23:39, wctaiwan <wctaiwan+li...@gmail.com> wrote:

> IANAL, but if there is some flexibility here, I would argue that extensions
> should *not* be considered derivatives. Legally, because extensions do not
> contain MediaWiki code (beyond using the programming API provided by core
> classes);


Ah, good! Yeah, programming to a provided and documented API should be
fine. (With WordPress, themes and plugins are very much programs
running in the same process, etc.)


> in practice, because we have many extensions licensed under
> licenses that are incompatible with GPL,[1] and I don't think we should
> require people to choose a GPL-compatible licence should they want to write
> MediaWiki extensions.
> [1] http://www.mediawiki.org/wiki/Category:MIT_licensed_extensions



- d.

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