Questions about the GNU General Public License

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15
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2answers
2k views

Using GPL libraries without modification on a commercial website, do I need to make my source code available? [duplicate]

If I write a public-facing commercial website, and use a GPL javascript library and/or binaries without modifying them (such as plupload), would I be required to make the source for my website ...
4
votes
1answer
754 views

Does a website running modified GPL software have an obligation to release their changes? [duplicate]

If a non-profit organization runs software on its website that is modified GPL'ed software and it acknowledged to be such, do they have a legal obligation to release any changes? They are not offering ...
7
votes
4answers
2k views

Call GPL software from non-GPL software

Can I (legally) use a program that is released under GPL from another program that I'm writing and not have to respect the GPL (for the program I'm writing)? For example, I have a GUI that uses a ...
41
votes
1answer
32k views

Can I use GPL software in a commercial application

I have 3 questions about the GPL here: If I use GPL software in my application, but don't modify or distribute it, do I have to release my application under the GPL? What if I modify some software ...
20
votes
2answers
3k views

How is client-side javascript covered by the GPL?

If I used a GPL-licensed Javascript libarary in a web application, would I then have to offer source code of the whole site to anyone who downloaded and executed the Javascript lib?
4
votes
4answers
2k views

Relicense BSD 2/3-clause code to GPL

Suppose I release some source code under the new BSD license. Is it allowed for someone else to take this code, make modifications to it and distribute it under the terms of the GPL? From Wikipedia: ...
11
votes
10answers
3k views

Rewriting GPL code to change license

I have found a GPL library (no dual license), which does exactly what I need. Unfortunately, the GPL license on the library is incompatible with the license of a different library I use. I have ...
29
votes
6answers
2k views

What are the Pros and Cons of the GPL? [closed]

I'm looking at licensing some open source software and am looking at the GPL. What are the pros and cons of using this license?
13
votes
7answers
4k views

Avoid GPL violation by moving library out of process

Assume there is a library that is licensed under GPL. I want to use it is closed source project. I do following: Create small wrapper application around that GPL library that listens to socket, ...
8
votes
3answers
3k views

How does the GPL static vs. dynamic linking rule apply to interpreted languages?

In my understanding, the GPL prohibits static linking from non-GPL code to GPL code, but permits dynamic linking from non-GPL code to GPL code. So which is it when the code in question is not linked ...
7
votes
5answers
4k views

Using C++/Java to develop software and sell it

I know this question has been asked here before, and I also know that this website is for programming questions only, but please do make an exception, as none of the posts I've come across on this ...
9
votes
1answer
3k views

Confusion about dual license (MIT/GPL) javascript for use on my website

I've read all of the posts I can find on this and I'm still not sure of the answer. I'd like to use a jQuery plugin on my website that is dual licensed under MIT and GPL. Does the dual license mean ...
5
votes
2answers
945 views

Rewrote GNU GPL v2 code in another language: can I change a license?

I rewrote some parts of Mercurial (which is licensed under GNU GPL v2) in C#. Naturally, I looked a lot into original Python code and some parts are direct translations from Python to C#. Is is ...
28
votes
7answers
1k views

Choosing a licence for open source projects

I've done some open source projects, and I plan to do more in the future. So far, I've released all my code under GPL, but I've read a few articles which claim GPL is too restrictive for any code to ...
16
votes
4answers
4k views

Can you change code distributed under the MIT license, and re-distribute it under the GPL license?

Is it possible to alter the code of the Chili plugin, which had its latest release on July 2008, and it is licensed under the MIT license, to then license it under GPL? As far I can see, there is no ...
8
votes
5answers
720 views

What are the consequences of GPL dependencies?

I am developing software for my company and I would like to use some libraries under GPL license. What could be the consequences? Does it mean that the code developed above these GPL dependencies ...
8
votes
1answer
447 views

How do I dual license?

I'd like to open source a project of mine under GPL v3. Additionally, I'd like to sell a license for those who wish to use the code in a proprietary application. How do I go about releasing my ...
7
votes
2answers
2k views

Including a GPL-license library in a commercial Java program

I am in the process of helping develop a commercial Java program. We want to use a certain third-party LookAndFeel in the GUI. The problem is that the LookAndFeel library is GPL licensed. Since we are ...
17
votes
3answers
1k views

Must source code released under GPL be human-readable?

In a response to another question, a poster suggested that under the GPL: ...you need to provide the human readable [code], not a whitespace stripped version... Readability would seem to me to ...
9
votes
2answers
2k views

Can I safely use an open source library in an internal closed-source project?

I m thinking of using iTextSharp, which is licensed under Affero GPL, in an internal closed-source WinForms project. No one outside my company will be using it. GPL (and Affero GPL as well) ...
6
votes
3answers
1k views

Can I use this GPL'd PGP library internally in my company?

This PGP library was bought up by Network Associates and then eventually Symantec Corporation. The source code is available and is licensed under the GPL (it was linked to from here). They have a ...
8
votes
3answers
908 views

Is it OK to learn an algorithm from an open source project, and then implement it in a closed source project?

Reference The post that started it all In order to clear up the original question I asked in a provocative manner, I have posed this question. If you learn an algorithm from an open source project, ...
5
votes
5answers
842 views

Is there a GPL-compatible software license for libraries which allows static linking, but requires redistribution of library source code?

I'm looking for an existing library license which satisfies the following conditions: GPL-compatible Can be statically linked with closed-source programs Binary modifications of the library, ...
5
votes
4answers
511 views

The GPL License Mixing

From the understanding that I am gradually gathering about the GPL it is not possible to mix licenses unless both have a special clause added to allow so. So how are the following possible? Let's use ...
4
votes
2answers
184 views

MIT app executing a GPL command

Can my MIT/BSD licensed, open source project, or a closed source project I build and sell, execute a command, where the command is a program released under the GPL? I would not be distributing any ...
3
votes
2answers
414 views

Copyright assignment on open source projects

Some time ago I wrote a BlackBerry application. I find that I now want to release it under an open source license. I am strongly considering the GPL v3 license. All the code is mine; there are no ...
2
votes
1answer
196 views

GPL - Writing an exception for a plugin interface under section 7 of GPLv3

The problem I've written a application for Android licensed under GPLv3 which needs to use Google Play Services, a proprietary library, as a plugin to the app. Now I'd also like to add libspotify as ...
2
votes
2answers
318 views

Proper attribution of derived work in a GPL project

This is a continuation of me rewriting GPL project. What will be the correct way of attributing my project as being a derivative of some other GPL-licensed project? So far I came up with: HgSharp ...
9
votes
1answer
791 views

How do I stay compliant with GPL when forking on Github?

I've recently forked a project on Github and made some modifications to it, pushed them back to the forked repository and asked the original developer to pull the changes. (I gather this is the ...
7
votes
2answers
730 views

Can a GPLv2 program rely on Apache-licensed libraries?

Can a software program licensed GPL (version 2) rely upon libraries licensed under APLv2 without running afoul of the GPL? The language here suggests to me perhaps not. In my specific case I'm ...
6
votes
5answers
1k views

What would happen if a bit of GPL code sneaked into the Windows source code? [closed]

Imagine that an unfaithful (or maybe careless) employee at Microsoft managed to sneak in three lines of GPL code into a the core of a distribution of Windows. Wouldn't this mean that Microsoft would ...
5
votes
3answers
320 views

How should I go about re-releasing a GPL-licensed project?

A few months ago we found a library licensed under GPL that fit the bill for what we were looking to do at that time. We included it in our codebase and all was fine. Now, a few frantic months of ...
5
votes
4answers
520 views

How should I implement my chosen software license?

I have always kind of wondered, but never took my time to actually ask these questions regarding licensing. Most of these questions are presumably pretty basic, but I have no idea what I'm dealing ...
4
votes
1answer
225 views

Could Apple and Microsoft allow the GPLv3 on their locked-down devices?

It seems that both Apple and Microsoft prohibit GPLv3-licensed software in the app stores for their locked-down devices (i.e. iOS, Windows Phone and the Metro part of Windows). I have heard various ...
4
votes
3answers
221 views

Dual licensing with GPL library

I have a question concerning derivative works of GPL'ed software. Imagine the following situation: A company writes a software (A) using a library (B) which is released under the terms of the GPL. Now ...
3
votes
1answer
2k views

LGPL 2.1 vs LGPL 3.0 Advantages and Disadvantages

From what I've read, LGPL 3.0 allows you to use the license together with other licenses, more permissive about that(Not even sure about that). From ...
3
votes
2answers
244 views

CLISP Common Lisp license - can it force my code to be released under GPL?

I came across this about CLISP: *"it all-but-forces your code to be released as GPL" here, when looking for a good Common Lisp implementation. How can a language force a license on your code? Is this ...
3
votes
1answer
641 views

Are these steps enough to put my bash script under GPL 3?

I have written a bash script I would like to put under GPL v3. I've read the GNU documentation on How to Apply These Terms to Your New Programs and How to use GNU licenses for your own software. ...
3
votes
2answers
186 views

Does this BSD-like license achieve what I want it to?

I was wondering if this license is: self defeating just a clone of an existing, better established license practical any more "corporate-friendly" than the GPL too vague/open ended and finally, if ...
3
votes
4answers
568 views

Is a program linked against an LGPL library in linux still under GPL?

If I were to write say, an embeded linux video server, how much of the code do I have to offer to someone who requests the source? Do I have to offer the code that directly links against the GPL ...
3
votes
4answers
626 views

Is running an executable as a child process the same as linking a library?

I'm planning on running an executable as a child process in my program (e.g. using Ruby's popen or C's exec() family of functions). However, the executable I'm planning on running is licensed through ...
3
votes
4answers
2k views

GPL Confusion! Can I sell a product with GPL covered components without making the source available?

I'm really confused.. I'm looking into making a commercial program and there are a few open source, GPL covered components i'd like to use.. Am I allowed to sell my product with the components in ...
3
votes
3answers
347 views

Sharing code in LGPL and proprietary software

I'm working on a piece of software that'll be released as a dll under LGPL. The software interfaces with hardware from a small company that has provided me with the needed libraries and some code to ...
2
votes
1answer
477 views

If I used GPL code in server side app, what if any of my code do I need to release? [duplicate]

Consider a service such as Netflix... if on the server side netflix used code with a GPL license attached, do they have to make their server side code available under the terms of the GPL? Obviously ...
2
votes
4answers
421 views

GPL licensed software installed on commercial hardware

Do vendors need to provide sources, at the customer's request, for GPL licensed software installed on the hardware they sell? For example, a vendor sells an IPTV box and pre-installs some proprietary ...
2
votes
2answers
350 views

How to get contributors assign copyright for copyright holder?

Let's say we have a company and we release our project under LGPL && GPLv3, as you know the only thing here is about contribution. People commit bug-fixes/features to the project, it's fine ...
2
votes
4answers
2k views

Can I use GPL, LGPL, MPL licensed packages with my application and make it closed source?

I saw a company is using BusyBox and also using Gpl + Lgpl + Mpl packages on it, and then they have there own application running on it. Their application is a closed source package. You buy the ...
1
vote
2answers
174 views

Can I maintain copyright of the name/logo of an otherwise copyleft (GPL) application?

I'd like to release an application that basically has the license of "the code is GPLd but forks cannot use the name or logo", with the intent of avoiding confusion to users. Is that possible or is ...
1
vote
2answers
147 views

Incorporating GPL Code in my Open Source Project

I have downloaded a currently inactive GPL project with a view to updating it and releasing the completed codebase as open source. I'm not really a fan of GPL though and would rather licence my ...
0
votes
1answer
403 views

Correct way to sell commercial product with GPL small scripts in it [closed]

I'm developing a commercial cms. I'm going to sell this cms. I use jQuery, also I use date and time picker jQuery plugin in my cms, I can say this is just a 1% of my big script, I don't want sell my ...