Z:gnu-www-ja-gpl-2.0-faq--11a168-Since the GPL is a copyright l/en

Since the GPL is a copyright license, the copyright holders of the software are the ones who have the power to enforce the GPL. If you see a violation of the GPL, you should inform the developers of the GPL-covered software involved. They either are the copyright holders, or are connected with the copyright holders. Learn more about reporting GPL violations.