Also, I need to check if Petka is a real product. A quick mental check: Metasploit is a well-known exploit framework, but Petka isn't something I recall. Maybe it's a fictional name, or perhaps the user has a typo. Let me confirm. If Petka is a real tool, then discussing its keygen would be problematic. If it's fictional, then the paper should still avoid encouraging unethical behavior.