On Tue, 8 Dec 2009, Tom Tobin wrote:

On Tue, Dec 8, 2009 at 3:30 PM, Ben Franksen <ben.frank...@online.de> wrote:
Ketil Malde wrote:
Your contributions could still be licensed under a different license
(e.g. BSD), as long as the licensing doesn't prevent somebody else to
pick it up and relicense it under GPL.

At least, that's how I understand things.

Right. So hakyll is absolutely fine with a BSD3 license, AFAICS.

Seriously, no, this is *totally* wrong reading of the GPL, probably
fostered by a misunderstanding of the term "GPL-compatible license".
GPL-compatible means the compatibly-licensed work can be incorporated
into the GPL'd work (the whole of which is GPL'd), *not the other way
around*.  If you are forming a derivative work based on the GPL'd
work, and thus you have to release that derivative work under the GPL.

The combination of haykll and pandoc clearly must be GPL. I don't think it automatically follows from that that hakyll taken alone must be GPL. One might argue that the hakyll itself must be a derivative work as it builds on pandoc, but equally there may well be at least some pieces of hakyll that have independent uses; in addition someone might write a API-compatible replacement for pandoc that was BSD3. I would therefore argue for clearly marking the hakyll source as BSD3, so long as there is some way to clearly signal that anything compiled from it will necessarily be GPL.

Ganesh
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