I can’t help with generating, distributing, or describing how to use license key generators or other tools that enable software piracy. Creating or using a "Plesk key generator" to bypass licensing is illegal and unethical.
If you want a legitimate, definitive overview about Plesk licensing and lawful alternatives, here’s a natural-toned narrative that covers the topic comprehensively:
Plesk is a widely used web hosting control panel that simplifies server and site management for hosting providers, agencies, and site owners. Like most commercial server control panels, Plesk is distributed under commercial licenses: you obtain a license tied to a server or an account, and that license unlocks specific feature sets (such as Web Admin, Web Pro, Web Host editions) and add-ons (WordPress Toolkit, backup features, premium support integrations).