Re: [Quantlib-users] regarding permission

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

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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