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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12
votes
3answers
2k 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
973 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 ...
23
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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 ...
7
votes
1answer
772 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
670 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
1k 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
1k 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
646 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 ...
26
votes
4answers
1k views

What are the arguments for considering dynamic links not 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 ...
17
votes
2answers
1k 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 ...
17
votes
4answers
448 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
154 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 ...
11
votes
1answer
404 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: ...
18
votes
2answers
611 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
70 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
89 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
922 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
218 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 ...
27
votes
3answers
1k 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 ...
27
votes
4answers
11k 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?

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