[cc-licenses] cc-by-sa and gpl

Prodromos Tsiavos p.tsiavos at lse.ac.uk
Mon Jul 2 13:42:26 EDT 2007


I would agree with Rob on dissuading you from using dual licensing, as it 
would only cause the same (and perhaps even more complicated problems) in 
the second generation of derivative works.

best,
pRo

----- Original Message ----- 
From: "Rob Myers" <rob at robmyers.org>
To: <adam at xs4all.nl>; "Discussion on the Creative Commons license drafts" 
<cc-licenses at lists.ibiblio.org>
Sent: Monday, July 02, 2007 8:36 PM
Subject: Re: [cc-licenses] cc-by-sa and gpl


> (I am not CC, I am not a lawyer, this is not legal advice.)
>
> adam hyde wrote:
>
>> It would seem the GPL would not be 'compatible' under these terms as the
>> GPL does not explicitly permit: "the relicensing of derivatives of works
>> made available under that license under a particular Creative Commons
>> license"
>
> That is correct.
>
>> The gpl does not do this. However, how does the CC-GPL fit into this
>> picture? :
>> http://creativecommons.org/license/cc-gpl
>>
>> Its the GPL with a CC wrapper...is the CC-GPL considered to be living
>> within the CC family of licenses? If so, then the CC-GPL is 'compatible'
>> and the question is answered.
>
> Ignore CC-GPL for the purpose of this discussion, that is just CC trying
> to explain the GPL to people. It's a very good idea (CC-FDL anybody?)
> but can be confusing.
>
>> is there anyone that can clarify this?
>>
>> Just to retour...My specific question is:
>>
>> Can content under the CC-BY-SA (3.0) be distributed under the GPL? ie.
>> Is the GPL or 'CC-GPL' a 'similar' or 'compatible' license as per the
>> license statement :
>> "you may distribute the resulting work only under the same, similar or a
>> compatible license."
> >
>> anyone want to make me a happy camper with a categorical yes or no? ;)
>
> Categorically: no.
>
> The GPL is not compatible with BY-SA, and is unlikely to be declared
> compatible.
>
> See above. ;-)
>
> If you are the original licensor you could dual-license under BY-SA and
> GPL, but that's a very bad idea.
>
>> The reason _why_ this is an interesting question for me is that
>> documentation about free software is often written in CC BY-SA. If this
>> material can be then distributed under the GPL then the docs could be
>> distributed with source code without causing developers extra license
>> headaches.
>
> You can distribute BY-SA material with GPL material. The FDL was
> designed to be applied to documentation distributed with GPL-ed
> software, and the principle is the same. This is aggregation, and is
> fine under the GPL.
>
> So a GPL-licensed piece of software with BY-SA documentation should be
> absolutely fine. Unless it breaks the rules of a particular distro (e.g.
> Debian).
>
> - Rob.
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