How does one go about cracking software/games?

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Colon capital V

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Pirating software is easy enough and unlocking it with fake liscenses and whatnot is another easy task provided the .nfo is clear enough, but I never thought about the work that goes behind trying to crack said games and software and making it accessible to people.

So how do these people do it? (not a glowpost)
 
I think part of the process is finding the section of the code responsible for unlocking the full version, figuring out what input/inputs will unlock it, and then creating the crack executable to crack the software. I believe there are other methids as well such as tinkering with the registry edit.
 
At a basic level, reverse engineering the raw ASM using a debugger. You find the section of the code that performs the piracy check, then remove or modify it, or try to make a local emulator for the verification. Or, for a keygen, reverse engineer the key checking algorithm to create valid ones. More modern software will use all kinds of packing and obfuscation techniques, try to kill debug processes, encryption, etc.

Shit's hard.
 
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