What Is GPL?GPL stands for the new General Public License, which is one of the most widely used copyleft licenses in the world. It protects both the rights of authors of the software as well as the rights of the users of the software. Since the GPL license protects both the authors and the users, it’s different than other traditional software licenses which are considered copyright licenses and protect only the authors of the software. More importantly, the GPL license protects the four basic rights of the users: the right to use the software, the right to study this software, the right to modify the software, and the right to share the software either modified or unmodified. The unique aspect of the GPL license is that it's designed to spread those rights in all subsequent versions of the software which means that it requires that all future versions of software based on any GPL-licensed software to be also licensed under the GPL. By doing so, we are in effect trying to use the instruments of the copyright law to flip it around and protect the rights of users so anyone who inherits a new version of the software is going to have the same rights as the original creators. Another note to remember is that licensing your software under the GPL creates an ecosystem of innovation because it allows anyone who wants to improve the software to freely do so.
What's the Difference Between GPL Products and non-GPL Products?When it comes to differences between a GPL and a non-GPL piece of software, we need to look at the difference between copyleft and copyright licenses. As mentioned earlier, copyright licenses are traditionally used to restrict the rights of users and restrict the rights of developers. Companies that release proprietary software licensed under copyright licenses do this because the company has determined that it is in their interest to create some kind of restrictive terms. But, in the 1990s, things started to change as some software developers said that they care more about the rights of users. They created a new approach to software licensing and called it the copyleft approach. This approach tries to protect and prioritize the rights of users which means that you as the developer have access to a whole new ecosystem of developers that can go through your code and improve it as well as help you maintain it and develop it. It’s worth mentioning that the GPL is actually just one license of this copyleft variety. There are other licenses like the Apache License, the BSD license, the LGPL license, and others.
Can I Resell WordPress Themes Licensed Under GPL to Clients for a Profit?A common misconception about the GPL license is that you cannot sell software but rather, have to release it for free. According to the GPL license, the right to sell copies of software is protected by the right to share software. This means that the GPL does not prohibit you selling the software and making money off of it. What’s more, the GPL as a license doesn’t impose requirements or restrictions on how much you can charge for distributing a copy of the software. Bear in mind that that any program that's licensed under the GPL can be sold at any price but you cannot require that anyone who receives software that you've created to pay you a fee or notify you any time they share it with someone.
Do GPL Companies Have to Provide Support and Updates?Another question that I get asked a lot is; are plugin and theme developers who provide GPL-licensed products required to provide support and updates. It’s not uncommon for some WordPress developers not to provide support or updates for their themes and plugins. According to Danny and the GPL license, they have that right. However, some WordPress developers have taken this right and turned it into a successful business model where you can download a theme or a plugin for free but you have to pay for the support.
Can I Protect My Work Under the GPL?A lot of developers, who aren’t familiar with the GPL, are afraid that if they create something and license it under the GPL, somebody will copy their work and take all the credit for it. It turns out that the GPL license protects the authors by helping them avoid what's called a proprietary competitor. In a nutshell, if your software is licensed under the GPL, the person who takes your work and uses it as a raw material cannot make that software proprietary. They have to release it under the GPL license as well.
Can I Copyright or Trademark GPL products?Before answering this question, it’s important to clarify a few concepts because a lot of people get confused when they hear the terms copyright and trademark. Copyright is the legal regime that governs software which means you can copyright software code under a license such as GPL. You can also copyright it under a different license because as the copyright holder you decide which license to use. Trademark, on the other hand, is a legal regime that governs the use of names, logos, and images. This means that you can trademark a name or your logo. However, that trademark is totally independent of the copyright license of the software. In WordPress terms, this means that you can trademark the name or the logo of your new WordPress theme or a plugin. But, the theme or plugin code itself will be licensed under the GPL so others can use it and modify it as they want; provided they comply with the terms the GPL license. On top of that, your end users would also be subject to your trademark’s usage policy which allows you to tell people whether or not they're allowed to use your trademark in any context.
Am I allowed to Whitelabel GPL and Non-GPL Products?Lastly, the whitelabel issue comes back to the difference between a trademark and a copyright. White labeling has nothing to do with the GPL because you're working in the area of trademark. If you want to white label WordPress itself, a theme or a plugin, you have to make sure that you are compliant with the trademark usage policy. Since GPL is not a trademark license, it doesn't say anything about whitelabeling rights.
What is GPL – Interview With Danny HaidarBelow, you’ll find a video interview with Danny Haidar from the Software Freedom Law Foundation. In the video, Danny gives us the full scoop on GPL and offers even more details about what all it involves and what can you do with software that’s licensed under GPL.
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