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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.

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4
votes
2answers
232 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
349 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
173 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
1k 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
77 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
87 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 ...
24
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'...
8
votes
4answers
751 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
345 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
66 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
53 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
101 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 ...
-2
votes
1answer
194 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 ...
9
votes
2answers
1k 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
198 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
540 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 ...
7
votes
1answer
63 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
404 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
207 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 ...
12
votes
5answers
680 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 ...
10
votes
3answers
1k views

How can I detect if someone is breaking my license terms?

If this question is about what we are supposed to do if someone is breaking the terms of a software license, I would like to know how I can know if some is doing so. Suppose that I'm writing a ...
9
votes
1answer
671 views

How does the GPL's linking restriction apply when using a proprietary library with GPL'd interpreted code?

General description: Can I create Python software that will dynamically link against a closed-source library that has a C API (the Python interpreter is not copyleft) and will also utilize a GPL ...
22
votes
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 ...
7
votes
1answer
698 views

What's the typical practice for cases when OSS license violation is found and fixed?

Suppose I ship binaries of a closed source product and it just so happens that there's a piece of GPL source code inside my giant codebase that I'm unaware of. At some point I find this GPL code and ...
7
votes
2answers
613 views

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

This question is a follow-up on: Are there examples of proprietary software that functionally depends on free software? Please note that this is not a duplicate, as "copylefted" (and some more, see ...
7
votes
1answer
820 views

What copyleft license should I use for my website's HTML/CSS/JavaScript?

If I made a somewhat complicated website, and I want it (the layout/JavaScript) to be under a copyleft license (but not the text), which license should I use? I want to pull others' forks so I have ...
7
votes
2answers
757 views

Which standard copyleft licences can be applied to Unity assets?

I would like to release a framework for Unity under a copyleft licence but have some concerns. My goal is for people to be able to use the framework to develop their own projects and only be required ...
9
votes
3answers
613 views

Will copyleft help me control what others are able to do with my code?

Given that I've written a program that I want to release as Open Source / Free Software (as defined by the OSI and the FSF), will choosing a copyleft license help me control what others are able to do ...
18
votes
4answers
606 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 ...
12
votes
2answers
510 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 ...
16
votes
4answers
324 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 ...
5
votes
3answers
125 views

How do I stop republication under a different license?

Suppose I am finishing an open source software. I am about to publish it but I just have to choose the license. I want it to be a CC-BY license but I don't want anyone to republish it under ANY other ...
9
votes
1answer
320 views

Why is the Reciprocal Public License OSI-approved but not FSF-approved?

The Reciprocal Public License (RPL) is interesting in that it is the only license both OSI-approved and not FSF-approved. It is a copyleft license similar to GPL but with a "reciprocal" clause: ...
16
votes
2answers
414 views

Are Copyleft and Share-Alike synonyms?

Copyleft and Share-Alike are two very similar types of licences. Here is how Wikipedia defines them: Copyleft (a play of the word copyright) is the practice of offering people the right to freely ...
10
votes
1answer
66 views

Is there a share-alike licence for media which specifies that the project files must be published as well as the finished media?

Is there any licence that can be used for artistic projects (images, music, etc.) that are similar to CC-BY-SA, but with the additional constraint that not only the resulting work should be made ...
9
votes
2answers
75 views

Does the licence of the database used have an influence on the final licence of the product?

Assume a standard server-side Web application. Database, backend, frontend. It's basic knowledge that one should check the licences of the libraries used before deciding on the license for the final ...
10
votes
5answers
647 views

Someone is violating the copyleft license, they are refusing to give me the source code even though they are required to!

This person has a piece of open source code which is released under a copyleft license. They are required to give me this code, but numerous times they have refused. I am stuck because I need this ...
15
votes
2answers
185 views

Jurisdictions without compatible copyright law

Free software licences such as GPL depend on copyright law in order to be legally enforcable. Are there jurisdictions in which the law does not enforce such licenses, allowing the license to be ...
24
votes
2answers
768 views

What do I need to share if I include CC-BY-SA artwork in my software?

CC-BY-SA is a Creative Commons license with a copyleft clause - if you derive something from it, you must also provide the derivative under the same license if you distribute it. The relevant clause ...
24
votes
4answers
7k views

What's the difference between permissive and copyleft licenses?

I've heard both terms thrown around, but I'm a bit unclear as to how the licenses differ. How is copyleft different to a permissive license? Is copyleft just the standard for open source licenses?