Hi William,

You can use any version of PyMOL, the plugin API is the same in all of them 
(Open-Source, Incentive with edu/academic/commercial license).

Your own code, if open-sourced, needs a GPL-compatible license. You're in the 
same situation as the person asking "can I release my SW under the MIT license 
in situation 3?" (answer: Yes) here: 
https://riverbankcomputing.com/pipermail/pyqt/2016-September/038129.html

Only if you are going to sell your plugin, you need to purchase a commercial 
PyQt license. See https://riverbankcomputing.com/commercial/license-faq

Hope that helps.

Cheers,
  Thomas

> On Mar 4, 2019, at 7:03 PM, William Tao <ywtao....@gmail.com> wrote:
> 
> Hi PyMOL community,
> 
> I am planning to develop a PyMOL plugin based on PyMOL 2.x versions with 
> PyQt. 
> 
> However, I am not quite clear about the legal implications and copyright 
> issues if I would like to make my plugin open-source in future. 
> 
> First, PyMOL has incentive version and open-source version. I have an 
> educational license for incentive version and open-source version. If I am 
> going to describe my plugin in a scientific article or website, which version 
> of PyMOL version am I allowed to use? 
> 
> Second, the PyQt requires the code based on it must also be open-source 
> according to GPL. 
> 
> These two factors make me confused about the possibility of publishing a 
> plugin for PyMOL in future. 
> 
> If anybody has experience in this aspect, please feel free to advise. 
> 
> Many thanks.
> 
> William

--
Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.



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