Re: [Quantlib-users] regarding permission

[Francois B. <ig...@gm...>]

Thanks, Luigi.

Does the BSD license then permit one to take the entire QuantLib source
code, repackage it as a commercial project and sell it, with no
modifications whatsoever (as long as you include the license text)? Of
course it's not what I intend to do. I'm just curious about how permissive
it is.

And following on, would someone be able to take the project and relicense
it under something else. I'm guessing that would require the permission of
all code contributors first, which would be quite a practical challenge.

Sorry if this is a bit off topic.

Francois Botha


On Sat, 5 Sep 2020 at 18:18, Luigi Ballabio <lui...@gm...>
wrote:

> Hello Mudit, Francois,
>     the QuantLib license is the 3-clause BSD license (<
> https://opensource.org/licenses/BSD-3-Clause>).  It allows you to do
> anything with the QuantLib code: your product can be closed source, and if
> you're modifying the QuantLib code, you don't have to make the modified
> source available.  I'm not a lawyer either, but as I read it, your only
> obligation is that if you redistribute/sell whatever it is you do, in
> binary or source form, you must also include the full text of the QuantLib
> license, including the disclaimer of warranty.  It doesn't mean you're
> applying the same license to your product!  Basically, you're saying that
> your product includes or uses some QuantLib code, and you're including the
> QuantLib license so it's clear to whomever uses it that the QuantLib
> developers are not responsible for anything that might happen as a
> consequence.
>
> Hope this helps.  In any case, you can find more information by
> researching the 3-clause BSD license.
>
> Luigi
>
> P.S. @Francois: GPL is an entirely different beast, and I'm not sure I'm
> qualified to answer about that.
>
>
> On Sat, Sep 5, 2020 at 9:27 AM Francois Botha <ig...@gm...> wrote:
>
>> Hi
>>
>> I'm also interested this question. Hope it's OK if I add to it, Mudit.
>>
>> I understand that the license is quite permissive, but I'm still not sure
>> exactly what it requires.
>>
>> Can I link to quantlib from a commercial product?
>>
>> Can I copy code directly from quantlib into my project and compile it?
>>
>> When do I have to release the quantlib source code alongside my
>> commercial product?
>>
>> I know few of us here are lawyers and that the usual disclaimer holds,
>> but I'm sure someone else here is less confused than I am.
>>
>> While we're at it, it doesn't pertain to quantlib, but how do the answers
>> to my questions change if the license were eg a GPL based license?
>>
>> Thanks
>> Francois
>>
>> On Sat, 5 Sep 2020, 08:42 Mudit Sharma, <sha...@gm...> wrote:
>>
>>> Dear list,
>>>
>>> I intend to derive a commercial product relying on Quantlib. I just want
>>> to be sure that
>>> I can use Quantlib freely for my product. I have read the license and I
>>> think my product will not violate it. However I have a doubt :
>>>
>>> 1)  In this page : https://www.quantlib.org/license.shtml
>>> there it is mentioned :  It allows proprietary extensions to be
>>> commercialized
>>> I wanted to know what exactly is meant by this statement.
>>> Can the extension be anything ? another library/api/website/blog etc ?
>>>
>>> Hoping to hear from you soon,
>>> Mudit Sharma
>>> _______________________________________________
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>>> https://lists.sourceforge.net/lists/listinfo/quantlib-users
>>>
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