Is it legal to use GPL plugins on WordPress?

Short answer: generally, yes — provided the code is actually covered by the GNU General Public License and its conditions are followed. The GPL allows people to use, study, modify, copy and redistribute software. The Free Software Foundation also explains that GPL-covered copies may be sold and that a distributor may charge for downloads. That does not mean every file found online is automatically GPL-compliant. The product license and the notices included in the package must be checked. A plugin may also bundle fonts, images, libraries or services governed by different terms. Why is GPL central to WordPress? WordPress is released under GPLv2 or later. The WordPress project states its view that plugins and themes are derivative works and therefore inherit the GPL. Plugins hosted in the official directory must use a GPL-compatible license. What does the GPL usually allow? When a component is genuinely GPL-covered, users may run it on their projects, inspect the code, modify it and redistribute copies, including for a fee. A seller may charge for curation, organization, infrastructure, technical checks, delivery support and convenience — not for exclusive ownership of GPL-covered code. What obligations remain? Redistributors must preserve applicable copyright and license notices, provide the license and follow the corresponding-source requirements of the relevant GPL version. Modified versions must be handled under the license and identified when required. The license shipped with the actual file should always be reviewed. GPL access is not an official license key Freedom to use the code does not require the original developer to provide an activation key, customer account, official support, private update service, cloud templates or other commercial services. Those features may require a direct subscription with the rights holder. A GPL file may work while excluding external services and official support. Trademarks and visual assets are separate The GPL primarily governs rights in covered software. Product names, logos, photographs and other assets may be protected by trademark, copyright or separate licenses. An independent distributor should not imply a partnership, endorsement or official representation. How to purchase more safely Check whether the offer clearly identifies the license, version, included features and exclusions. Prefer technically reviewed files, keep backups and test updates in a staging environment before changing a production website. Be cautious with files advertised as “cracked” or modified to bypass controls: this is not required by the GPL and may introduce malware. Conclusion Using or purchasing a legitimate copy of GPL-covered software can comply with the license, including in commercial settings. The answer still depends on the license and contents of each package. This article provides general information and is not legal advice for a particular situation.