<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Come to think of it, I imagine the license has language saying that it cannot be superseded in part or in whole by any contradictory agreement.<br><br><div dir="ltr">—<div>Sent from mobile, with due apologies for brevity and errors.</div></div><div dir="ltr"><br><blockquote type="cite">On Feb 10, 2022, at 5:42 AM, Alex Balashov <abalashov@evaristesys.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8">Is it legally possible for a customer to separately contract away a right that the license otherwise affords them, such as the GPL right to demand source code and then turn around and distribute that source code?<div><br></div><div>I have to wonder if it’s possible in the US. It seems like it shouldn’t be, but in principle, in the prevailing theme of Anglo-American jurisprudence, it’s possible to contract away pretty much anything, no matter how adverse to one’s interests, so long as it is done “freely”.<br><div><br><div dir="ltr">—<div>Sent from mobile, with due apologies for brevity and errors.</div></div><div dir="ltr"><br><blockquote type="cite">On Feb 10, 2022, at 2:37 AM, Henning Westerholt <hw@gilawa.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">just to add to the discussion:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-GB" style="mso-fareast-language:EN-US">Please have a look to the GPLv2 FAQ, many topics you’ve raised are discussed there
<a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html">https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html</a><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-GB" style="mso-fareast-language:EN-US">You should really consult a lawyer for this specific questions<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Regarding the licence of the configuration (native script vs. KEMI) – my understanding would be that a native Kamailio cfg script would be independent of GPL as its interpreted (and
practically the customer gets the “source code” anyway). But KEMI LUA code that is pre-compiled would fall under the GPL, so the customer has a right to get the source code for it. Compare e.g., to this:
<a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html#IfInterpreterIsGPL">
https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html#IfInterpreterIsGPL</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Henning<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">-- <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Henning Westerholt –
</span><span style="mso-fareast-language:EN-US"><a href="https://skalatan.de/blog/"><span lang="EN-GB" style="color:#0563C1">https://skalatan.de/blog/</span></a></span><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Kamailio services –
</span><span style="mso-fareast-language:EN-US"><a href="https://gilawa.com/"><span lang="EN-GB" style="color:#0563C1">https://gilawa.com</span></a></span><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:35.4pt"><b>From:</b> sr-users <sr-users-bounces@lists.kamailio.org>
<b>On Behalf Of </b>Olle E. Johansson<br>
<b>Sent:</b> Thursday, February 10, 2022 8:13 AM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> Re: [SR-Users] SEMS license with kamailio and rtpengine<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt">Hi Seven!<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Note that many of these questions open a legal discussion that has been going on for many years. I base my answers on what I know, which may not be the full truth. Regardless, I have been involved in these kind
of discussions for almost 30 years of working in open source.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">First, note that there are two kind of situations to observe. One is when your application is executing in a system. The other is the license of the written source code files. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Secondly, license and copyright are two different things. You always have the copyright to your source code.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">In Kamailio there are source code files that have a different license than the rest of the files. That means that if you copy that source code and create a new product that license applies.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Kamailio as a whole is released under GPL version 2. When you run Kamailio in your server, that license applies to it all, regardless of the license of various source code files.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Also note that I base this discussion on a delivery of a system to a customer. When you run Kamailio as a service you do not deliver (according to GPL v2) and the customer doesn’t have the same rights to the source.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Also note that (as other persons has pointed out) that it’s the recipient of the binaries that has the rights, not the world. If I am not your customer, I can’t demand the source code according to the GPL. The
customer that receives the code has the right to do whatever they want with it - like publishing the source on GitHub for the world to enjoy.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-left:35.4pt">10 feb. 2022 kl. 00:16 skrev Seven Du <<a href="mailto:dujinfang@gmail.com">dujinfang@gmail.com</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">I have some questions on this, e.g. on Kamailio:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">1. The core and some modules is GPL. I packaged that without change, and sell to a customer. and when the customer asks for source, I told him to download from the kamailio website, since I didn't change anything.
Is that correct?<o:p></o:p></p>
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</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">How you distribute the source code to the customer is irrelevant here. Note that if you end up having to provide it on a floppy disk or a USB stick, you can charge for that according to the GPL :-)<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">2. I can also host the source on my own website, with some more helper scripts for building and packaging. That should be better?<o:p></o:p></p>
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</div>
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</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">I can’t judge if it’s better or worse, it has very little relevance to with the license. Just make sure that you include the signatures made by the Kamailio team so the customer can trace it back to the source
and make sure there’s no changes.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">3. I write a new module, 100% code wrote from scratch, just follow the module guidelines or example code to expose/add hooks to core, dynamically loaded into kamailio. Do I need to use GPL or can it be any license
or even closed source? can I sell the standalone module in binary?<o:p></o:p></p>
</div>
</div>
</div>
</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">Your source code has to be licensed in a license that can end up being compatible with GPL. You can not have a commercial license on it, since when executing it as part of Kamailio, GPL applies.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Since your module ends up being GPL while running in a system you deliver for a fee or for free to your customer, your customers has a right to the source code.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">4. my module still should be GPL since I have to call GPL code in kamailio source, e.g. string functions in core. or maybe it's ok if string functions in kamailio core is BSD?<o:p></o:p></p>
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</div>
</div>
</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">When executing ALL of Kamailio is GPL, including all linked modules.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">5. If my module link to a 3rd party lib (e.g. libclosed-source.so or libclosed-source.a I think there's no difference?) which is not open source (but free to sell), can I sell it w/o the source of libclosed-source
?<o:p></o:p></p>
</div>
</div>
</div>
</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">Linking means that you execute in the same processes and according to most this means that GPL applies. That’s why we have a lot of protocols where most people think that GPL does not apply, even though some people
want to discuss that. In my personal view it’s ok to write commercial software that communicates over RPC or by using the http_client with Kamailio.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">In Asterisk, the license specially permits this use of the various Asterisk protocols since there was discussions. Most Asterisk developers believed it wasn’t necessary and that GPL did not apply when using protocol
based API’s. But nevertheless, just to avoid discussions, this was clarified in the license.<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">6. If answer to 5 is yes, I can write my own libclosed-source and sell with whatever license?<o:p></o:p></p>
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</div>
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</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">You can, but if it links to Kamailio in run-time, then it will at that point become GPL licensed regardless of what you have written. That’s why many companies stay away from GPL, especially libraries that are
licensed with GPL, because it can affect your own licenses.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">7. Regards to KEMI, if I write routing scripts with Lua (compiled with luac) and sell to a customer, should I open source the Lua code? The Lua code calls Kamailio core functions which might be GPL.<o:p></o:p></p>
</div>
</div>
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</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">That is an interesting question which I’m not ready to answer. I think the intention of the Kamailio dev team is that your code should not be affected by GPL, but we may want to clarify that.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">If you write a regular configuration script I would personally clearly think you have the rights to that. The idea with KEMI was to introduce modern ways of writing configuration scripts.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Thanks. I don't mean to violate the GPL, just want to be clear and easier to understand the license.<o:p></o:p></p>
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</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt">Always good to start the day with a GPL discussion :-)<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Cheers,<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">/O<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">On Wed, Feb 9, 2022 at 9:05 PM Henning Westerholt <<a href="mailto:hw@gilawa.com">hw@gilawa.com</a>> wrote:<o:p></o:p></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
Hello,<br>
<br>
(just to add the obvious disclaimer that this is not legal advice, I am not a lawyer).<br>
<br>
> [Would it be ok] if it were [using] a standalone service to which Kamailio interfaced using very narrowly confined and general-purpose communication channels?<br>
<br>
I do not think there is a problem regarding to the GPL in this case. Interfacing over SIP/HTTP/RPC/XMLRPC or other standard mechanism to a dedicated process would not establish a close coupling between Kamailio and the other code.<o:p></o:p></p>
</blockquote>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">I think it's correct. e.g. if you use evapi or http to talk to your service you don't have to open source your service code.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">Cheers,<br>
<br>
Henning<br>
<br>
-- <br>
Henning Westerholt – <a href="https://skalatan.de/blog/" target="_blank">https://skalatan.de/blog/</a><br>
Kamailio services – <a href="https://gilawa.com/" target="_blank">https://gilawa.com</a><br>
<br>
-----Original Message-----<br>
From: sr-users <<a href="mailto:sr-users-bounces@lists.kamailio.org" target="_blank">sr-users-bounces@lists.kamailio.org</a>> On Behalf Of Alex Balashov<br>
Sent: Wednesday, February 9, 2022 1:50 PM<br>
To: Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org" target="_blank">sr-users@lists.kamailio.org</a>><br>
Subject: Re: [SR-Users] SEMS license with kamailio and rtpengine<br>
<br>
<br>
> On Feb 9, 2022, at 7:46 AM, Henning Westerholt <<a href="mailto:hw@gilawa.com" target="_blank">hw@gilawa.com</a>> wrote:<br>
> <br>
>> If modules are designed to run linked together in a shared address space, that almost surely means combining them into one program.”<br>
> <br>
> This is exactly what applies to Kamailio due to the core and module architecture. The core and modules also share common data structures and memory segments.<br>
<br>
I see. So, practically, the only way a custom module could be considered meaningfully separate according to these criteria is if it were a standalone service to which Kamailio interfaced using very narrowly confined and general-purpose communication channels?<br>
<br>
— Alex<br>
<br>
-- <br>
Alex Balashov | Principal | Evariste Systems LLC<br>
<br>
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)<br>
Web: <a href="http://www.evaristesys.com/" target="_blank">http://www.evaristesys.com/</a>,
<a href="http://www.csrpswitch.com/" target="_blank">http://www.csrpswitch.com/</a><br>
<br>
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