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From "John D. Ament" <john.d.am...@gmail.com>
Subject Re: Podling Graduation Rally
Date Tue, 21 Feb 2017 14:31:30 GMT
On Tue, Feb 21, 2017 at 1:49 AM Marvin Humphrey <marvin@rectangular.com>
wrote:

> On Mon, Feb 20, 2017 at 10:47 AM, Mike Jumper <mike.jumper@guac-dev.org>
> wrote:
> > AFAIK, only the copyright holder can relicense a copyrighted work,
> whereas
> > others may sublicense under compatible terms so long as the original
> > license grants that permission (ie: the license of the original work is
> not
> > actually changing).
> >
> > Is that not correct?
>
> Correct, and well said!
>
> When we assert that an Apache release package is available under the
> ALv2 even though it bundles BSD-2-clause licensed code (as is the case
> with MADlib), we are suggesting that the ALv2 "subsumes" the
> BSD-2-clause license -- that fulfilling all the requirements of the
> ALv2 suffices to fulfill all the requirements of the BSD-2-clause
> license.
>
> This is sometimes called "sublicensing", and it only works in one
> direction: a license with more restrictions can subsume one with
> fewer, but not the other way around.
>
> In contrast, "relicensing" is usually taken to mean the original
> copyright holder granting an *additional* license of any type. For
> example, if you're the copyright holder, you can take something which
> is available only under a proprietary license and make it available
> under an open source license.  Or you could take something available
> under the GPL and make it available under the ALv2.
>
> (Of course the difficulty of "relicensing" in the context of open
> source is that there may be many copyright holders who need to
> participate in a relicensing effort -- and if you can't get them all
> on board, you might have to strip out and replace code that couldn't
> be relicensed.)
>
> For more information on combining software under multiple open source
> licenses, I like this article by Luis Villa:
>
>
> https://opensource.com/law/11/9/mpl-20-copyleft-and-license-compatibility
>
> This is outdated but still a good read:
>
>    http://www.catb.org/esr/Licensing-HOWTO.html#compatibility
>
> Marvin Humphrey
>


So are we saying that the code modifications are sub-licensed? Or
re-licensed?


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