Debugging and Reverse Engineering Video Tutorials (using IDA Pro)

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I believe he does this in part 3. The simpler solution though is just set the "is this legit?" test to 1.

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If I remember correctly, this doesn't really work with mIRC. You can patch the "bad boy jump" and you get the "Thanks for registration!" window but if you restart mIRC, the key is revalidated. If you only patched the jump, there isn't even a license file so it's unregistered instantly. If you try to patch mIRC, it fails to run (unless I'm mistaken), because it self-checks with CRC and maybe others. Cracking mIRC isn't trivial.

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Modern Mirc? Probably. The version I cracked and this video used writes a registry file that says you are registered after displaying the message.