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Re: do DFSG require that derived works use the original licence?

On Mon, Nov 22, 2010 at 09:15:52PM +0100, Lukas Baxa wrote:
> Hello,
> I went through the Debian Free Software Guidelines (DFSG) and I have
> a question to point number 3 - Derived works - which states:
> # The license must allow modifications and derived works, and must allow
> # them to be distributed under the same terms as the license of the
> # original software.
> If I understand it correctly, it must be allowed by the original licence
> that the license of the derived work is identical (or almost identical).
> But it is not required that the licence remains unchanged, it might be
> different.
> However, the description of free software referenced on the main website
> of debian (http://www.debian.org/intro/free) contains following:
> ...
> # Authors of free software on the other hand are generally looking for
> # some combination of the following:
> #
> # - Not allowing use of their code in proprietary software. Since they
> #   are releasing their code for all to use, they don't want to see
> #   others steal it. In this case, use of the code is seen as a trust:
> #   you may use it, as long as you play by the same rules.
> ...
> # - Forcing any work that includes part of their work (such works are
> #   called derived works in copyright discussions) to use the same
> #   license.
> ...
> As far as I know, GPL requires it. But it seems to me that DFSG do not.
> Does it mean that it would be possible to include software in Debian
> that could be derived and licensed otherwise than the original
> software?


> And does it mean that such derived software might even be a proprietary
> software?
> Lukas


By example:


Josué M. Abarca S.

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