Questions tagged [plugins]

A plugin is a piece of software that extends another piece of software via an internal interface.

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2 votes
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Does MySQL / MariaDB allow proprietary (i.e. close-sourced) storage engines?

I understand that MySQL (community edition) and MariaDB are under GPL v2 license. Does it mean that it is not allowed to build proprietary database storage engines for them? It is inevitable that one ...
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  • 21
3 votes
1 answer
77 views

How can an AGPL web application allow proprietary plugins?

We are developing a web application (REST API backend + frontend, both Python/Flask if that matters). We want to distribute it as a free software and we'd prefer a GPL license over a less restrictive ...
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  • 133
3 votes
2 answers
57 views

Non Wordpress-repository Plugin license

A client asked me to write a WP plugin that is just for their website - it won't be on the repository. Basically it contains a form, place-able with a shortcode, and then sends the collected entry ...
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  • 33
1 vote
1 answer
107 views

A use of BSD-headers and linking with BSD-libraries in GCC project

One question about GCC and GPL3. Is it possible to use library's headers with BSD-like license inside GCC project(-fork)? Suppose there is a BSD-library named A (libA), which describes some IR-A. The ...
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6 votes
1 answer
356 views

Is it possible to use a LGPLv3 plug-in in a GPLv2 program?

From the license point of view: Is it possible to use a plugin written under "LGPLv3+" in a program protected by "GPLv2"? The plugin is built as a ".so" library and at ...
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  • 163
1 vote
1 answer
41 views

GPL in Plugin for a open source application

I am trying to do a feasibility study for doing a plugin that implements a 2D geometry solver in various programs. The solver is GPL v3. Some of the programs are GPL themselves but some are not, like ...
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  • 113
0 votes
1 answer
118 views

Is it possible to restrict GPL3 licensed software to non-commercial projects?

I am searching for a suitable license for my project (A Grav CMS PHP Website Rating Plugin). I want to ensure that: The code is published open source The code will be kept open source by other users (...
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4 votes
1 answer
103 views

Including GPL plugin in repository of MIT code

I have an MIT-licensed library that supports user-provided backends. I was asked to implement a backend that would require using a GPL-licensed library. If I write such a backend, license it's files ...
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5 votes
2 answers
140 views

Is it okay to combine a proprietary program with a GPL program after distribution?

I want to distribute a combined work containing program X, plugin P and plugin Q. Plugin P has a proprietary license (which allows redistribution) and plugin Q is distributed under the GPL. X has a ...
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3 votes
3 answers
196 views

Releasing the source code of a premium feature for another open program

If I use a compiled program/non compiled source code which is under a license that everyone has the rights do use and sell (Eg: GPL) and no one can deny any person to use or sell it and then I want to ...
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24 votes
6 answers
4k views

How can GPL terms apply to distribution of a proprietary plugin?

Let's say I develop a plugin for third-party application X. My plugin has a non-free license, and is commercially distributed. I don't distribute application X. Application X is licensed under GPL, ...
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  • 351
2 votes
1 answer
115 views

Can I sell closed source plugins that interface with a GPL v2 software which is open sourced? [duplicate]

Basically, I have an idea for some software based on an Open Sourced application. If I was to build an application based off of that, and sell my plugins, would this be a breach of terms? This is the ...
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7 votes
1 answer
352 views

GPL Application linked to a LGPL library loading proprietary-plugins

This is a bit similar to what asked in this question, unless that here the case is that the application only directly loads LGPL code, and this one then may dlopen a proprietary lib, so: GPL Program ...
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  • 121
0 votes
1 answer
91 views

WordPress: only built plugin GPL licensed

We are developing WordPress plugins. As WordPress itself is GPL licensed we must publish our plugin as GPL, too. Our complete plugin development environment is built on top of a lot of devDependencies ...
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2 votes
2 answers
282 views

Can I use GPL libraries in plugins without infecting a host commercial application?

I'm quite confused about what are the obligations of GPL libraries in the context of plugin based software. Let's say I want to distribute & sell a plugin based app as closed source providing to ...
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  • 129
3 votes
3 answers
296 views

Must a plugin for a GPLv2 work also be GPLv2?

I would like to develop an addon/extension plugin for an existing WordPress plugin, to add some premium features, but the base plugin's source-code is under GPLv2, which makes me doubtful... Is any ...
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2 votes
1 answer
145 views

WordPress: is extending plugin allowed by GPLv2?

I would like to extend an existing plugin (for example FileBird), to add some features, and later publish and sell it off... But although the plugin's source-code can be simply downloaded from ...
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6 votes
1 answer
370 views

Can I GPL licence a plugin for a non-free program

I am working on a plugin (in lua) for a proprietary program, but would like to make my plugin open source, and require that anyone making derivative works/plugins also do so. This seems like a good ...
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4 votes
2 answers
879 views

Closed source plugin for a GPLv2 application

I wrote a library that is indeed a subclass of QTreeView. So I can easily attach it to any Qt application that uses QTreeView. I want to patch a GPL application (GPL_APP) in a way that it searches ...
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7 votes
1 answer
1k views

Using GPL licensed library over a service for non-GPL softwares

I want to use a GPL v2 licensed library(esper) for commercially distributed non-GPL softwares but I need to make sure non-GPL software not violate GPL license. Can I use this library indirectly using ...
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  • 173
3 votes
1 answer
271 views

Are Amx Mod X plugins under GPL v3 license?

The Amx Mod X is: AMX Mod X is a versatile Half-Life metamod plugin which is targetted toward server administration. It has a wide array of scripting capabilities so people can write "plugins", ...
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  • 275
4 votes
2 answers
798 views

Can license-incompatible program communicate with GPLv2 program via websocket?

I'm writing a program for automation under a license that is incompatible with GPLv2 (it's dual-licensed: GPLv3/Proprietary). Let's call it my automation program. And there is third party GPLv2 ...
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  • 41
7 votes
2 answers
582 views

AGPL and Node.js

Supposed I have written a server in Node.js that I licensed under AGPLv3. Now, if somebody takes my code and modifies it, this is a derivative work. So far, so good. Supposed my server has the ...
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5 votes
1 answer
136 views

"Primitive" GPL:ed OS and proprietary programs and address spaces

I have read about FSF plugin policy If modules are designed to run linked together in a shared address space, that almost surely means combining them into one program. (Emphasis mine). Now there ...
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5 votes
1 answer
206 views

Hosting (potentially) non-GPL plugin's

Background: In the audio processing world, most programs to compose and mix music in (collectively called DAW's from now on) are commercial and closed source. These programs can extend their ...
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  • 215
8 votes
1 answer
389 views

Can plugins for non-gpl open source software use GPL libraries?

I want to write a plugin for an open-source software which is not GPL, but has a GPL-compatible license (MIT/BSD). I would like the plugin to use a GPL library. Can I do this? My rationale: Since ...
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  • 181
6 votes
3 answers
825 views

Usage of GPL program as optional external tool

My software is designed to use third-party external tools if the user wishes to do so. Some users would like to use GPL-covered binaries as external tools (i.e. they tell my software "use this dll to ...
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  • 161
2 votes
2 answers
60 views

Can I use Event Organiser plugin in a commercial plugin for WordPress?

Can I use this plugin in a commercial plugin for WordPress?
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5 votes
2 answers
349 views

Copyleft license that allows usage in plugins of closed-source host applications

I wrote a library that I want to release under the GPL to prevent it from being incorporated in closed source software. I do not want people to use this library in their closed source commercial ...
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  • 479
16 votes
2 answers
5k views

Can plugins for closed source software use GPL'd libraries?

I use closed-source scientific software for my work. I also use GPL licensed tools and libraries. It would save me a lot of time to be able to call a GPL library directly from the closed-source ...
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  • 479
17 votes
4 answers
554 views

Does a host application's license apply to plug-ins written for it?

This was prompted by another question which reminded of a past experience. Consider the following: An open-source project supports a plug-in architecture The project is released under a copyleft ...
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