Re: [Quantlib-users] regarding permission

[Luigi B. <lui...@gm...>]

You're right on both counts.  It's that permissive, and relicensing would
require agreement from all contributors.

Luigi


On Wed, Sep 16, 2020 at 10:41 AM Francois Botha <ig...@gm...> wrote:

> 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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>>