Linked Questions

20 votes
3 answers

Can I relicense an abandoned GPL project if the copyright owners are no longer responsive?

Suppose I want to use GPL-copyrighted software in a closed-source project. With actively maintained projects I can contact the copyright holders to see if I can work out an agreement with them. But ...
Dmitry Grigoryev's user avatar
15 votes
5 answers

Use GPLv3 library in a closed system (no software distribution)

I'm developing a software that will be preinstalled in a headless PC. The user will see the "output" of the software processing (sent with a given protocol via ethernet), and can configure some ...
il_mix's user avatar
  • 259
14 votes
4 answers

What is derivative work? What is "build upon"?

I have been reading up on Open Source licensing, but there is this one term that I think needs clarification: when is work derivative? If I have an image viewer that accepts a ZIP file and I ...
Tormod's user avatar
  • 243
10 votes
5 answers

Distribute the code as closed source and the end users download GPLv3 dependencies separately

I check the FAQ page of GNU Licenses but cannot find the answer. If someone is using my code (in Python) that is released under GPLv3, does s/he violate my GPLv3 rights if s/he uses my library ...
EKP's user avatar
  • 101
19 votes
2 answers

Can a non-GPL python program use GPL Python module?

Suppose I have a Python library which is distributed under the GPL license. I would like to use that library in my program, that I may eventually want to distribute under non-GPL terms. The library ...
Pasha's user avatar
  • 586
21 votes
2 answers

What are the arguments for considering dynamic links to constitute derivative works?

The status of programs which are dynamically linked with Copyleft licensed binaries (such as a .dll) is contentious. I have created two questions for each side of the debate. The other can be found ...
curiousdannii's user avatar
4 votes
2 answers

What if I don't know whether my program will be linked to a GPL library or not?

Suppose a program uses an API which has two implementations: An MIT implementation which uses GPL libraries A newer version of it which no longer uses any GPL libraries Neither is distributed along ...
user avatar
4 votes
2 answers

GPLv2 - licensing for commercial use

I have a few questions regarding the GPLv2 license: For it to be GPLv2, I need provide access to my source files? If I use the v2 license, but charge for use, do users HAVE to purchase my license in ...
Cptn's user avatar
  • 49
6 votes
1 answer

Will there be any restrictions if I use a MIT licensed module which is built on a GPL library in my commercial software?

I want to use a Python module ( in my commercial software. This module is licensed under the MIT license whereas the library (Poppler) it is built on is licensed ...
Piyush Agrawal's user avatar
9 votes
2 answers

Are there examples of proprietary software that functionally depends on free software?

This question is a follow-up on a number of questions that all mention some sort of software architecture X for creating software composites, and then goes on to ask: "Will using X to create a ...
Free Radical's user avatar
  • 9,095
7 votes
2 answers

Does sharing a file format make two programs either a combined or derived work?

This is a follow on from Does a file format constitute an API? This is an attempt to break down: Does a host application's license apply to plug-ins written for it? into the underlying questions. ...
kdopen's user avatar
  • 6,967
6 votes
4 answers

Is linking a correct proxy for derivative work determination in (copyleft) FOSS licenses?

I tend to use these simple tests to determine if the copyleft terms of a third-party project apply to the calling/reusing code: if the calling code is linking (statically or dynamically) with GPL-...
Philippe Ombredanne's user avatar
7 votes
1 answer

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 ...
agit's user avatar
  • 173
1 vote
2 answers

Can you commercialize a GNU General Public License product?

So from what I understand a product under GNU General Public License needs to stay under GNU General Public License (with references to the previous copyright owner). So if you sell it then the full ...
Aäron Pattyn's user avatar
8 votes
2 answers

Using GPL-ed library from code with more permissive license (MPL-2)

I'm writing a library and a tool on top of it, and I would like to release both under MPL-2. However, the library has an optional dependency, another library which is released under GPL (not LGPL). I ...
gavv's user avatar
  • 436

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