Questions tagged [license-compatibility]

License compatibility is the comparison of two or more licenses to determine if certain usages and actions can be made. Use this tag if the question would like to determine the compatibility of licenses, or their individual clauses.

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55
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3answers
2k views

How can I determine if two open source licenses are compatible with each other?

Given two open source projects, each with different licenses, are there metrics or resources I can use to determine if it is legitimate to copy code from one of the projects to the other?
34
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6answers
2k views

Can I copy-paste a snippet from Stack Overflow into my GNU-GPL project?

I have found on Stack Overflow a 10-lines block of code that does exactly what I want. There is no license information in the post nor on the answerer's profile page, so the CC BY-SA 3.0 license of ...
22
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9answers
7k views

Can I modify an open source license to require that I be notified?

I often use the MIT license for my projects. But recently I've had the thought that I really would like to be notified if someone forked my software, whether it's for personal use, released or not I ...
22
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3answers
1k views

Copyfree Open Innovation License compatibility

I'm interested in the Copyfree Open Innovation License as a simpler alternative to Apache 2.0 (it is a permissive license with an explicit patent grant). But because it's not so popular, not much ...
19
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1answer
3k views

What are the differences between GPL V2 and V3 licenses?

One of the most widely used and most popular free and open source software licences is the General Public License. I want to know in simple terms: what are the differences between GPL Version 2 and ...
18
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3answers
9k views

If I'm using a GPL 3 library in my project, can I license my project under MIT license?

If I'm using a library that is licensed under GPL v3 in my project, can I license my project under the MIT license? I tried to read the GPL v3 text but I cannot understand it without your assistance.
17
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1answer
2k views

GPL V3 with OpenSSL Exception

I've decided to license some code I have yet to release under the GPL v3. However, OpenSSL is used quite a bit in the software and I know that the two licenses are explicitly cited as being ...
16
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4answers
330 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 ...
16
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1answer
616 views

Can I release under AGPL a program that uses a GPL library?

I just wrote a program that embeds and uses a GNU-GPL library (GPLv3 or at your discretion any later version). Can I release my program under the GNU AGPL v3 license?
16
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2answers
4k views

Can I link a Apache 2.0 library into software under GPLv2?

The Apache 2.0 License has a built-in linking exception: For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to ...
16
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2answers
1k views

Are permissive licenses (MIT/BSD/zlib) compatible with CC-BY?

Permissive licenses like MIT only require that you include the license text if you redistribute. CC licenses that have the BY part require that the original authors are attributed, but in flexible ...
15
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2answers
789 views

Can I “upgrade” the version of CC BY-SA from 3.0 to 4.0 in my modification?

What I'm doing: I'm adapting a work licensed under CC BY-SA 3.0 Unported license to a different language. I'm indicating the original work and its license. I'm indicating that I have made changes to ...
14
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3answers
3k views

Are software licenses version-specific?

When you put a license in your software, is it bound to all the versions of your software, or only a specific version? If I have licensed my software version 1 under license A, and then I developed ...
14
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2answers
4k views

Why is GPLv2 incompatible with GPLv3?

As I understood in this wonderful answer, GPLv3 and GPLv2 code can't be used simultanously in the same product. Why?
14
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2answers
3k views

Combining code written under different licenses (Eiffel Forum License, MIT and Apache), what are my options?

So I'm new to all this licensing jazz, and I've just started work on a project I'd like to one day publish as open source. I've found a couple of projects so far that have code to accomplish stuff ...
14
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3answers
1k views

How does one combine differently licensed code in one open source program?

I'm the author of WorldPainter. It's licensed according to the GPL v3, but I am about to include some code (dynmap) that is licensed according to the Apache License version 2.0. According to both ...
13
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4answers
590 views

Are licenses affected if the author adds conflicting clauses alongside?

I see this one quite a lot: an author releases something under a standard free/open license (i.e. not a crayon license), but on the same release page adds a clause that conflicts with the license. I.e....
13
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1answer
511 views

Is there a reason to prefer the SimPL over the GPL? Does it carry the same legal weight?

I just came across the SimPL License which is described as: This Simple Public License 2.0 (SimPL-2.0 for short) is a plain language implementation of GPL 2.0. The words are different, but the ...
13
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2answers
4k views

How is the BSD GPL-compatible?

The BSD license says that derivative works may be distributed under the following conditions: Redistribution and use in source and binary forms, with or without modification, are permitted ...
12
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2answers
104 views

Can I have one license cover part of a software and another covering the other half?

Scenario: Lets say I have a software I have been developing. I am about to release it but I first have to apply some licenses. Question: Suppose I want to release part of the software (the code) ...
12
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3answers
473 views

Can Apple require users to accept the Xcode/iOS license to use git?

After launching an upgrade of XCode on a MacOS Sierra, calling git in a terminal suprisingly results in: $ git Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via ...
12
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2answers
778 views

Is Stack Exchange's CC-BY-SA v3.0 content compatible with the GPL?

Currently, all user submitted content is licensed under "cc by-sa 3.0 with attribution required". This shows up at the bottom of each page: user contributions licensed under cc by-sa 3.0 with ...
12
votes
1answer
497 views

Is it possible to release a project under the GPL if it contains MIT-licensed libraries?

Specifically the Symfony PHP framework, which is MIT licensed. I've read that the two are compatible, but I want to make sure that a system I develop can be released complete under the GPL.
12
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1answer
2k views

How to licence a project which includes MIT, BSD, Modified BSD, and New BSD libraries

I've been working on a project for a while, and I'm almost ready to release it, but I've been more concerned with getting it to build than legal considerations, and now I'm not at all sure where I ...
11
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4answers
1k views

Remove BSD LICENSE file while importing code into GPL project

Can LICENSE file be removed from 3rd party BSD project that is merged with GPLed code? There are license headers in each file, but files will be modified, so BSD license in them will no longer be ...
11
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2answers
274 views

What counts as adaptation for using code licensed under CC BY-SA 4.0 in software licensed under GPLv3?

Since 2015-10-08, GPLv3 is listed as one-way compatible license for CC BY-SA 4.0: […] you may license your contributions to adaptations of BY-SA 4.0 materials under GPLv3, but you may not license ...
11
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1answer
242 views

Can software licenced in Eclipse Public Licence be used in a project with GPL?

JUnit is licenced under Eclipse Public Licence which, according to Wikipedia, is incompatible with GPL. So does this mean if you’re working on a project licenced with GPL you can’t use JUnit? It's too ...
11
votes
1answer
586 views

Is the Facebook BSD+Patents licence (aka “The React Licence”) compatible with the GPL?

Is the Facebook BSD+Patents licence compatible with the GPL (GPLv3), in the sense that one could: use code licensed under BSD+Patents, as part of a project, the rest of which you write yourself (own ...
11
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2answers
2k views

Can I license Python project under 3-clause BSD while it has GPL-based dependencies

I'm working on an open source Python project and we have plans to use GPLv2-licensed library python3-xlib, but we will not distribute it with our library. So user can install it by pip install our-lib ...
10
votes
4answers
4k views

Are CDDL and GPL really incompatible?

Wikipedia seems to suggest that CDDL and GPL are incompatible, yet no one knows for sure why or how. Why and how are the CDDL and GPL are incompatible?
10
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2answers
628 views

Can I post code examples with GPL software on Stack Overflow?

Suppose there is a Python library called g which is licensed under GPL v2.0 (or v3.0). Suppose further that the library is sufficiently complex that it contains some C/C++ component(s) that are ...
10
votes
2answers
479 views

Can I use GPL v3 for source code and CC BY-SA v3 for comments?

I have some source code for which I am the copyright holder. I want to release it under the GPL, but when it was closed source, I copied a bunch of a stuff from Wikipedia for a couple of classes and ...
10
votes
2answers
104 views

What License can I use in my project if I use CC-BY/CC-0 Music?

I did a google search and read through some license information, blog etc. here and there but I'm just not sure whether I can use CC-BY/CC-0 Music in my OpenSource Project no matter what license I use ...
9
votes
3answers
590 views

What is the copyright status of Colossal Cave Adventure?

What is the copyright status of the source code of “Adventure” (also known as Colossal Cave Adventure)? There is a good record today of the history of Adventure. Specifically: The 1975–1976 Crowther ...
9
votes
2answers
183 views

How to deal with unofficial/proprietary licences - are open source projects of this type really open?

Recently I was confronted with several projects that claim to be open source. I was happy to find their source code on a public repository but when looking at the license I was wondering why they do ...
9
votes
1answer
675 views

Including untouched LGPL library in a MIT-licenced project

Can I include a library licenced under LGPL 2.1 in an MIT-licenced project without any legal problems? Since it's not a compiled language, I would provide the full untouched source code of the ...
9
votes
1answer
77 views

How to deal with third party libraries?

I'm working on a project I would like to release as an open source project in the future. In my work I'm using a number of third party libraries, either from open source projects or released to the ...
9
votes
1answer
285 views

Creating an open-source project that includes Open Game License 1.0a content

Looking through Wizards of the Coast Open Game License 1.0a, and reading around it, it seems it is a weak copyleft license, where anyone can distribute content that derives from OGL content, provided ...
8
votes
3answers
430 views

Can I use CodeProject code in a GPL project?

I have an open-source project that I originally wanted to license under MIT, but since I'm using a GPLv3 component that I can't quite get rid of (namely, the .g4 ANTLR grammar file that I'm using to ...
8
votes
2answers
202 views

When does a forked project require a license?

I haven't quite grasped the implications of forking a licensed project to public. I am assuming that a similar license should be kept, but what happens if that's not possible? Edit I am providing ...
8
votes
3answers
3k views

is CC BY license GPL compatible? CC BY vs CC0

CC0 license is GPL compatible. A component with such license can be included in GPL-licensed product. Is this true also for CC BY license? What is the difference between CC0 and CC BY licenses? ...
8
votes
3answers
3k views

Linking from LGPL 2.1 software to Apache 2.0 library

The FSF claims that GPL v2 is incompatible with Apache 2.0 and that linking to a library generally creates a derivative work of this library. However, the linking exception of the LGPL allows ...
8
votes
1answer
913 views

Adding feature to an Apache v2 package

I'm working on one npm package based on another one but with another approach, this package is licenced under Apache v2 and I want to use MIT. After some use of my package I've noticed I need to use ...
8
votes
1answer
128 views

Why is the CC sampling+ license incompatible with other CC licenses?

Creative Commons used to publish a license called "Sampling Plus", but according to this page, it was retired/deprecated in 2011 due to inadequate demand and "Not compatible with any other CC license"....
7
votes
2answers
887 views

Proprietary software made of free software parts

Is it possible to use free software libraries or parts of a free software system in proprietary software without violating the licenses? In other words, can I build a system that uses some parts of a ...
7
votes
2answers
88 views

What prevents the community converging on a small set of licenses?

By a quick count, wikipedia lists almost fifty different open source / free software licenses. Assuming (and this may not be valid) that many of these licenses were created in the early days of the ...
7
votes
1answer
141 views

Dual license compatibility

Suppose I place work I publish under two licenses. If the two have conflicting attributes which property should be used. Can you specify which properties you want two be applied from the two licenses?...
7
votes
1answer
118 views

How to Audit licensing of old project?

I manage a project with a very long open source history - Zikula (and https://github.com/zikula/core). Zikula grew out of PHPNuke and PostNuke. Most of the oldest code is long gone, but some legacy ...
7
votes
2answers
274 views

Can I make a derived work of a GPL project and a non GPL project for personal use?

In the GNU General Public License, version 2, some limits on how you can modify the Program are listed. Point 2.b states that (emphasis mine): You must cause any work that you distribute or publish,...
7
votes
2answers
346 views

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 ...