: Add code to your application to validate the license key against the Keygen servers [21].

: Use tools like IDA Pro , x64dbg , or OllyDbg to find the "check" routine where the software validates a key [1, 5.1].

: Identify the mathematical transformations applied to a username or hardware ID to produce the expected serial key [5.2].

: Code a small program (often in C++ or Python) that performs those same transformations in reverse to produce a valid key [5.3, 25].