C++ REVERSE ENGINEERING

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Hi guys , I need help for reverse engineering. I don't found wrong key error but I found If the key is correct, say this message.. How can i find wrong key errors
and A program is free between x hours. How can I make the program always free? 

My english bad, sorry for this  :monkas:

[249]

You can always drag it into IDA or Olly and find the point where it checks to see if the key is valid or not and set a break point there or byte patch it to go to the success message, that will only work if it's hardcoded in though. You might be able to find the key if you sort by strings in IDA but again that's only if it's hardcoded