- What exactly is copyleft, and how does it work?
- What are the GPL license terms and conditions?
- Is the GNU General Public License (GPL) legally enforceable?
- Is it possible to sell GPL-licensed software or source code?
- Is the GNU General Public License (GPL) safe?
- Is it a requirement under the GPL license that the author provides the changed source code?
- What's the difference between the GPLv2 and the GPLv3 licenses?
- Is it possible to combine the GPL with other licenses?
- What is covered under the LGPL?
- What exactly is covered under the AGPL?
- What are the GPL license terms and conditions?
GNU’s General Public License is an abbreviation for GNU’s General Public License, and it is one of the most widely used open-source licenses. Richard Stallman designed the GPL to prevent the GNU software from becoming proprietary. It’s a particular use of his “copyleft” concept.
What exactly is copyleft, and how does it work?
Copyright is a law that prohibits the use, modification, or distribution of creative works without the consent of the copyright owners. When an author distributes a program under a copyleft license, he asserts his claim to the work’s copyright and declares that others are free to use, alter, and distribute it as long as the reciprocity duty is met.
This means that any program based on a GPL component must be made available as open-source. As a result, any product that includes a GPL open source component (regardless of its fraction in the overall code) must disclose the whole source code, as well as all rights to change and distribute it.
What are the GPL license terms and conditions?
If you include a GPL component in your program, it is regarded a ‘work-based on’ a GPL, and you cannot claim patents or copyright on it. A copyright notice, a disclaimer of warranties, intact GPL notices, and a copy of the GPL are also required to be shown.
- You are not permitted to modify the license or add new terms and conditions.
- You have a reciprocity responsibility, which means you must release the source code as well as all rights to alter and distribute the code in its entirety.
Is the GNU General Public License (GPL) legally enforceable?
Because it is fundamentally a copyright license, the GPL is enforceable. The GPL program’s copyright owner has the option of enforcing the GPL on distributed or derivative works of the program.
The FSF, for example, owns the copyrights to numerous components of the GNU system, including the GNU Compiler Collection. If copyright infringement occurs on that program, the copyright holder has the ability to enforce the copyleft obligations of the GNU General Public License (GPL).
Is it possible to sell GPL-licensed software or source code?
Yes, the GPL license permits users to sell both the original and modified versions of software. It may be perplexing, but free software is defined in terms of freedom, not cost. As defined by Richard Stallman, free software means “free as in free speech,” not “free as in free beer.”
If someone pays you money to acquire your software, however, GPL allows him or her to distribute it to the public for free or for a price.
Is the GNU General Public License (GPL) safe?
Yes, I agree. The GNU General Public License has nothing to do with the code’s security. It’s basically a piece of software with a license that controls how it’s used and distributed. Indeed, as we’ve demonstrated in earlier pieces, open-source software can be safer than proprietary software since there are more individuals looking for and addressing bugs.
Is it a requirement under the GPL license that the author provides the changed source code?
Only if you distribute the changed software does the GPL forces you to provide the amended source code. There’s no reason to disclose a program’s source code if you’ve changed it for personal use. However, if you make the updated application public, you’ll have to make the source code public as well.
What’s the difference between the GPLv2 and the GPLv3 licenses?
There has always been some ambiguity about what qualifies as a “work based on” another work, which triggers the GPL reciprocity duty. When the reciprocity duty is activated, the FSF endeavored to make GPLv3 more clear. The Free Software Foundation even created a second GPL license, the Affero license, to solve a specific misunderstanding known as the “ASP loophole.”
In addition, the FSF attempted to improve the GPLv3’s interoperability with other licenses. Both programs must allow for the combining of two codes into a bigger work. The licenses of both programs must allow such rights for them to be interoperable. The FSF increased development opportunities by making the GPLv3 more compatible.
Is it possible to combine the GPL with other licenses?
It’s a common misconception that GPL-licensed code cannot be blended with code from other open-source software licenses. While there are certain limitations, it is technically conceivable under both the GPLv2 and GPLv3 licenses. This is even more clearly shown by the new wording used in the GPLv3. GPLv3 is officially compatible with the Apache 2.0 license, according to the Free Software Foundation. However, there is a problem with the original BSD license since it has a condition that is not included in the GPL (the requirement on advertisements of the program).
What is covered under the LGPL?
The LGPL (Lesser General Public License) is a less restrictive license (weak copyleft). So the LGPL is a license that allows free software to be integrated into both free and proprietary software.
The LGPL and GPL licenses vary in one significant way:
the LGPL removes the need that you open up the source code of your own software extensions. You are only required to submit your modifications to the LGPL if they are made to the original free library. Because the LGPL applies to all free libraries, every user of your program must be able to edit, recompile, or replace the free LGPL library and use its changed version with your program.
You must also allow (or explicitly prohibit) reverse engineering of the work that utilizes the library in order to facilitate debugging when the LGPL library is updated or replaced with newer versions.
It’s worth noting that the LGPL is compatible with the GPL: if you choose, you may “upgrade” to the GPL and use it in a fully GPL-licensed project. You can’t, however, re-license GPL-licensed code as LGPL-licensed code.
What exactly is covered under the AGPL?
The Affero General Public License (AGPL) is a variant of the GPL designed for server-based applications. Consider the case where a programmer alters a GPL-licensed application. In such situation, he must distribute the changed software under the same license, but if the application is only available on a server, the developer is not truly releasing it to the rest of the world.
This scenario is covered under the AGPL. The AGPL requires the developer to make the changed version of the software available to everyone who utilizes the service.
So there you have it: the answers to 10 of your most frequently asked questions about the GNU General Public License. Is there anything else you’d want to add? I’d be delighted to research the answers for you.
Some GPL web sites: https://gplplugins.club/