WinRAR is proprietary software. Using a keygen to bypass the license is a violation of the End User License Agreement (EULA).
I understand you're looking for information about WinRAR keygens, but I should clarify that generating or using keygens to bypass software licensing is illegal and violates WinRAR's terms of service. WinRAR is shareware, and while it has an unlimited trial period, creating or distributing unauthorized keys is software piracy.
For more information on WinRAR and its licensing, I recommend visiting the official WinRAR website or consulting with the software developer's support team.