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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.

2
votes
1answer
34 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
votes
1answer
90 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
votes
2answers
161 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
vote
1answer
113 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
votes
1answer
47 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 ...
0
votes
0answers
12 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
votes
1answer
641 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
vote
1answer
46 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 ...
7
votes
1answer
59 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. ...
0
votes
1answer
34 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
votes
1answer
36 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
votes
1answer
50 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 ...
6
votes
1answer
110 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 ...
4
votes
1answer
94 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 ...
27
votes
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 ...
5
votes
1answer
108 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 ...
2
votes
4answers
238 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, ...
2
votes
1answer
89 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
vote
1answer
33 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 ...
3
votes
1answer
99 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
votes
1answer
65 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
vote
1answer
84 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. ...
5
votes
1answer
63 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 ...
5
votes
3answers
104 views

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-...
1
vote
1answer
55 views

Is it possible to have a non-comercial license, while allowing commercial use of derivative works and further modification of the derivative work?

This is a somewhat complicated situation, and I have trouble finding a Creative Commons license that is appropriate. Here is what I want the license to do: Others should be able to redistribute my ...
8
votes
2answers
1k 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....
10
votes
2answers
2k views

What are software dependencies, and what are the implications of FLOSS dependencies for other projects?

How could I best explain software dependencies to a non-software, non-tech person? What are software dependencies, such as package dependencies or linking dependencies? And why does it matter to ...
7
votes
1answer
223 views

Is a CLA only useful for copyleft licensed?

Is it useful to have a CLA when you e.g. use an MIT license for your project? I am just asking this, because when you use the MIT license you are already granted to sublicense it, so is a CLA ...
4
votes
1answer
62 views

Are derived videos of ShareAlike licensed material subject to CC BY SA?

If a video were to include media released under a Creative Commons share-alike license, would the final video also need to be released under a similar license since it is a derivative?
4
votes
2answers
96 views

Can you use your own work in a closed source product if it's licensed under the GPL?

I'm new to licenses and don't really understand the difference between the license choices on GitHub. If you license your own work under the GNU General Public License, does this mean you wouldn't be ...
4
votes
1answer
195 views

Does OSL 3.0 require user access to source if I sell access to it as SAAS?

We are a small group of developers who are looking to base a product we have in development on a OSL 3.0 licensed Project (OroCRM). I have been having trouble understanding the exact terms of the OSL ...
2
votes
1answer
154 views

Doom port on android. Does copy left apply?

I want to understand how the GPL license extends based on this practical example. There is an android port for doom called D-Touch This link Doom itself is licensed under GPLv2. Will the license ...
5
votes
2answers
465 views

Combining GPL with non-commercial license

I've been a hobbyist programmer for a long time, and only recently have I been writing code I've thought others might benefit from. Here's my conundrum: I'm a big supporter of the GPL, and I ...
3
votes
1answer
75 views

Open source licences and copyrighting

My question is: where lies the border for a programmer to copyright new software when in GNU/linux basically everything is released on very restrictive licences that force you to copyleft your work? ...
3
votes
1answer
74 views

How much does code have to interact for the GPL to take effect?

The GPL says that if you use program A, you agree that if you make a program B that relies on program A, program B must be GPL (otherwise, you violate the GPL and therefore lose the right to use ...
25
votes
2answers
4k views

Do you violate the GPL if you provide source code that cannot be compiled?

In a recent question on programmers.SE†, it was asked whether a project is open source if it provides some source code but doesn't make it clear how to actually compile it. Consensus is that it'...
7
votes
4answers
495 views

Does physically removing GPL code relieve combined work from GPL publication requirements?

Here's the scenario. Alice crafted a compression library and published it under GPL. Bob crafted a font processing library which uses pieces of code from Alice's library and ... let's call it overly ...
1
vote
2answers
285 views

Pacifist copyleft-like partially-open-source license

I'd like a license restricting use to non-military projects, but otherwise just like the GNU GPL. (There is obviously no point in making a permissive license like that, because editing a comment is ...
17
votes
4answers
3k views

What is copyleft?

Straight up: I've never heard of the term 'copyleft' before. The fact that I get that little red squiggle under it tells me it's not really a word. Concisely, my question is, what does it mean to you? ...
3
votes
2answers
56 views

JPEG comment to convey Copyleft Multi-Licenced Copyright Notice

This question is related to Copyleft Multi-Licenced Copyright Notice. I upload pictures on commons.wikimedia.org and I want to facilitate the reuse but I want derivatives stay "libre". Therefore I ...
3
votes
2answers
46 views

Copyleft Multi-Licenced Copyright Notice

I want to allow any usage/modification/distribution of my work except with the restriction that my work and derivatives must stay "libre". Therefore I think the right way is to publish my work under ...
3
votes
1answer
82 views

Is a ROM image an “executable file” for GPL purposes?

I am planning to include a program covered by the GNU General Public License and a GPL-incompatible program in a collective work designed for a machine that executes programs from a cartridge ...
-1
votes
1answer
141 views

What's “use CDDL for things already under CDDL” mean?

Circa 2006, blogs.sun.com/chandan/entry/copyrights_licenses_and_cddl_illustrated says, in comparing EULA, GPL, CDDL and BSD, that one must "use CDDL for things already under CDDL". But what does it ...
8
votes
2answers
562 views

So the GPL doesn't restrict the creator of the software in any way?

In another thread I started (Redhat buys Ansible), I am trying to figure out the economic value of a company transaction with respect to GPL'ed software. A few of the answers suggest that the owners ...
9
votes
3answers
190 views

Using copyleft licenses for non-programming purposes

Well, what I love about GPL is that any derivative work using GPL-licensed work also needs to be GPL licensed, which guarantees that derivative work is open-source, i.e. when requested the source of ...
5
votes
1answer
351 views

How to best indicate license of source code and copying terms of binary when multiple licenses are involved?

Suppose I have some open source project which makes use of both GPL and MIT licensed components. The source code of my project is also MIT licensed (not copyleft). What is the right way to indicate ...
6
votes
1answer
55 views

Good licence for a new documentation project

I want to publish a lot of documentation on programming and other similar topics I have been writing over the years. The documentation consist of explanations, diagrams, exercises and code examples. ...
9
votes
1answer
325 views

Can I preserve exceptions in GPL 3?

GPL 3 allows adding additional clauses, such as exceptions, as long as such exceptions grant additional privileges. But if I distribute software under GPL 3 with exceptions, are those exceptions ...
5
votes
3answers
181 views

Does a CC BY-SA 4.0 specification lose any AGPL3+ benefits?

If I release a program specification [1] under the AGPL, and the program itself under the AGPL, the two are obviously compatible: I can develop them at the same time, copy text (for example, method ...
11
votes
5answers
662 views

Appropriate licence for later merging back

I am a library developer. I want to open source it soon, but I'm not sure what license will work best for me. My main concerns are: I want to provide a commercial license for somebody who is willing ...