Questions tagged [copyleft]

For questions about the copyleft concept (also known as Share-Alike), a concept that promotes or enforces the use of the same or compatible license for derived works.

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1answer
23 views

What does AGPLv3.0 section 7f mean and can you give an example of its use?

In section 7 of the AGPLv3.0 there is the possibility to make limited changes to the license. I don't think I understand the changes allowed by subsection f) and I have certainly never seen it ...
3
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1answer
38 views

Appropriate copyleft license for translation files

I'm using a GPL license (with an AppStore exception) for my app and CC BY-SA for the images used in the app, as I know the GPL isn't appropriate for artwork. However, I'm wondering what I should ...
4
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1answer
76 views

Forking an AGPL v3 project that went closed source?

A project (desktop app) that I've been using for a while has decided to go closed source. I fully respect the decision, but also have no interest in the direction where this new development is headed. ...
2
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2answers
58 views

Distributing MIT application with GPLv3 plugin without releasing source for MIT application

We have a MIT licensed application which we sell packed under virtual appliance to our customers. the application has a marketplace where users can download and install additional plugins. We wish to ...
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0answers
22 views

Is use of Creative Common's BY-SA licensed database in software 'adaption'?

I am building a functionality in my propriety software for translation of names between Spanish (and other languages) and English. The translation function works by typing words in Spanish which then ...
9
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2answers
2k views

If my R package uses GPL packages, does mine automatically inherit GPL?

I've built an R package that uses a mix of libraries licensed under GPL-2 and GPL-3. From what I've read, because of this dependency, my package will also have to be GPL. See here: https://www.gnu....
7
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1answer
355 views

GPL Licensed Woocommerce paid plugins

I have very basic question. I'm building website service where I want to use WooCommerce Subscription and Membership plugins. These plugins are paid on the official websites, but there is written ...
4
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2answers
86 views

Is Open Public License suitable for libraries?

I would like to know if the Open Public License (OPL) allows library being bundled together or be a part of other code covered by other license (e.g. standard copyright - closed source code). I found ...
7
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1answer
91 views

Creative Commons ShareAlike, weak or strong copyleft?

I am wondering whether Creative Commons ShareAlike is a weak or strong copyleft license. That is, does it allow linking with code with under a different license?
1
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1answer
69 views

GPL with license exception for iOS?

I'd really like to use the GPL license for my cross-platform mobile app. I want to publish on the iOS AppStore, the terms of which indirectly prohibit the GPL from being used. What's the best way to ...
0
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1answer
45 views

How can an AGPL library be more permissive when using the library's public APIs?

Server-client based HTTP open-source projects like MongoDB use AGPL/SSPL for their main backend implementation and use a more permissive license for their client so that devs embedding MongoDB clients ...
2
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1answer
37 views

Does the GPLv3 license on my project require me to also include the source code of a tool to edit the icon of my executable file?

Godot requires a tool called rcedit to change the application icon. According to my understanding of GPL, I believe I have to include the source code of Godot with the releases of my game. Do I also ...
6
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1answer
63 views

In which cases must I relicense my product under the CC BY-SA license?

Because copyright law can encompass a huge range of scenarios and be unclear to talk about in abstract terms, I'm going to give concrete examples. I understand CC BY is a permissive license. All it ...
4
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1answer
593 views

Are there any AGPL-style licences that require source code modifications to be public?

So my understanding of the AGPL, is that it requires modifications to be distributed to the users of the network service, but I'm looking for a licence that would require any modifications (non-...
6
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2answers
424 views

If I use a public API endpoint that has its source code licensed under AGPL in my app, do I need to disclose my source?

If there's a public API server that has it's source code licensed with AGPL, and if I make an app that uses these public endpoints in some part of it, (entire application doesn't necessarily depend on ...
6
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3answers
171 views

How to deal with copy-left in source-code history prior open-sourcing?

Given the following situation: A software project is released as open-source under a non-invasive license (e.g., BSD 2/3 clause, Apache 2, ...). During the process, the entire Git repository is made ...
1
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1answer
51 views

How do Wikipedia licenses, CC-BY-SA and GFDL differ?

Wikipedia licenses most of their text and images under two licenses, CC-BY-SA and GFDL. We can choose either of the licenses while using the work. I know both of them are copyleft licenses and ...
10
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2answers
1k views

Will adding a BY-SA image to a blog post make the entire post BY-SA?

I tried to read the license deed but it was too advanced for me to understand. Consider these 2 situations, I take a CC-BY-SA image and upload it to my blogpost it as is, without any modification. I ...
2
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1answer
56 views

My university is asking to choose between BY-SA and GFDL to release my work

An infographic I designed is to be uploaded to my university website. They have asked me to choose between the BY-SA and GFDL to release my work. I tried looking up the difference but I cannot find ...
4
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2answers
80 views

Amount and way of publishing under share-alike license

I found a small C++ code example (containing a function) that is under CC-BY-SA-4.0 license. I am thinking about revising that example, extending it to multiple functions and using it in a much bigger ...
5
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1answer
326 views

Why to prefer permissive license over copyleft license?

In open source software/projects why do people release there codes with permissive license instead of a copyleft license. I mean the original author will not get back much (if anything at all ) if he ...
2
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2answers
78 views

Are there advocates for open source, copyleft biology?

I know this might seem off-topic, but you can think of a living organism as a software, with its DNA/genome being the code. In that sense, there is a project aimed at discovering the source code of ...
4
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1answer
102 views

Is there a license that “forces leaks”, so to speak?

I am looking for a license that "forces leaks", so to speak. What I mean by that is: A copyright holder must convey a copy of derivatives works they made using the license to anyone who requests it. ...
1
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1answer
128 views

How does share-alike play with commercial use?

I'd like to know how a licence can both allow commercial use and be share-alike. My reasoning is as follow : If we use it in a product (which is authorized by the "commercial use" part), we have to ...
4
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1answer
56 views

Revert copyleft license without consent of all copyright holders

Let's say that Alice has started a project under a permissive license, e. g. MIT. Then Bob forked it and added some features. Now the project has two copyright holders, Alice and Bob. Then Bob decided ...
3
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1answer
98 views

Compatibility of RPL (Reciprocal Public License) with other licenses

I have found a library that I would like to use in my project "as-is", but it is licensed under the Reciprocal Public License. As far as I understand it, you have to make your source code using that ...
4
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1answer
195 views

How do I detect an AGPL violation?

For client side code, even if it is obfuscated or is just a binary, I can imagine there might be ways of doing this, but if I have some server-side AGPL licensed code, how am I supposed to know that ...
5
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2answers
240 views

Is there a good license for a libertarian programmer who's against intellectual property?

I know, I know, you're probably thinking CC0 or WTFPL or something along those lines. But the thing is, the way I see it, people have a right to redistribute anything, even if the author doesn't want ...
1
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1answer
579 views

Using iText library with AGPL license to make application open sourced

I am working on a project to generate a 508 compliant annual PDF Publication from our database using iText 7 java library. This library works great for accessible PDFs. We are in the process of ...
3
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1answer
111 views

How should I license my project if it can install GPL-based plugins?

I'm developing a software which has two parts, kernel and plugins, their code are completely separated. Here's the question: Some of the plugins should be GPL based, as they invoked GPL code. The ...
18
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4answers
627 views

What are the arguments for considering dynamic links to *not* 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 ...
0
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0answers
15 views

can I use CC BY-SA 3.0 media (pictures) in a software partly licensed under a non-derivative license?

I am working on a software wich contains graphics i didn't make that are licensed under CC BY-SA 3.0. since the software contains other parts I didn't make, I want to put it under two different ...
4
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1answer
1k views

Is dual licensing a software that contains gpl programs possible?

I have seen that there is a question about gpl and dual licensing, but I know copyleft can behave different depending on the shape of the software. so here's my question: I have a package of lua ...
1
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1answer
87 views

Can you make GPL-licensed software using the Tizen SDK?

Unfortunately, Tizen has a proprietary SDK, as discussed here, which mandates that: You may not use any component part of the Tizen SDK in any way independent from the Tizen SDK. You may not load ...
2
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4answers
376 views

How to anonymously submit GPL licensed source code to a science fair?

I've created a personal project and licensed it as GPL3 (I'm a fan of the open source movement). The source code is posted publicly on GitHub. I'm planning on submitting it to the Siemens Competition, ...
7
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1answer
81 views

Can I license Latex code under GPL but the content under CC BY-SA?

I have written a non-trivial scientific text for university. It is written in Latex and I want to make the source available under GPL (v3 if that matters) so other can learn from my Latex skills. ...
26
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10answers
9k views

Is there a generally accepted “anti-copyleft” clause or license?

I would like to publish code for an application under an open source license like BSD, MIT, or Apache 2 which allows for changes and derivative works to be contributed back to the open source project ...
4
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1answer
175 views

LGPL 2.1 snippet copyright attribution

I want to use portions of code from the FFMPEG library to provide screen capture function for a commercial application I'm writing. I do understand I need to make a shared library out of the function ...
0
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1answer
35 views

How to control content changes under a CC BY-SA

I am writing a fiction whose goal is to bring the reader to examine her/his political beliefs in the light of various political implications and then to arrive, on her/his own, at possibly different ...
4
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1answer
136 views

Under AGPLv3+ do I need to provide the source for secondary applications?

I am working on a central application (AGPL3+) that will control and/or provide access to multiple secondary applications, mostly on other servers. It is trivial for me to provide the source for the ...
4
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1answer
76 views

Is it more accurate to compare CC BY-SA to LGPL rather than GPL?

CC BY-SA, LGPL and GPL are all copyleft licenses. GPL's key feature is that by embedding one work in another (as defined in a software context), the combined work becomes GPL. With LGPL this is not ...
3
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1answer
57 views

Is there an existing license that is copy-left by default, but allows use in proprietary software through case-by-case negotiation?

I'm looking for a license which is designed such that anyone can use my code so long as the license they release it under is copy-left. However, I'd also like to be able to license my code out for ...
2
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1answer
117 views

CC BY-SA – Do I need to open source my app if I don’t really distribute it?

I started developing a commercial web application that uses spaCy – a MIT-licensed library for natural language processing. In order to use this library, one needs to initialize a processing pipeline ...
1
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1answer
45 views

GPL copyright owner copyleft [duplicate]

If a GPL owner decides to make their code close sourced, say to make a derivative work for themselves (maybe commercialize), what steps should they take? If they need to rewrite their code, what ...
22
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2answers
3k views

Must a company disclose proprietary source code if it violates a copyleft license?

What is the typical situation when some company is found to violate the some copyleft free software license and refuses to fix it? Can the company then be forced to disclose any proprietary code that ...
2
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1answer
127 views

Is there a temporary copyleft license?

Suppose I produce some work, and I want all derivative works released before the year 2030 to be open source under the same license, but during and after the year 2030 I wish to allow derivative works ...
3
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1answer
67 views

Open source components in a larger one-off system setup

I'm in the early concept and planning stages of a large-ish interactive installation. The installation is a one-off for a large client; think a mix between science museum interactive stands/kiosk-type ...
1
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1answer
97 views

If I include a ShareAlike/GPL/viral-licensed character in my videogame, is my videogame stained?

I'm making a video game with importable custom characters. My characters have a special license that forbids pornography and blasphemy in derivative works. It is viral in itself to prevent such acts. ...
4
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1answer
71 views

Manufacture PCB's using GPLv3 license

I own a startup company that manufactures PCB's. We decided to release them under the GPLv3 license to eliminate the hassles of patents and so forth. Another factor is that we use code on the ...
12
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2answers
533 views

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 ...