Some of my friends say that their cracked antivirus software updates regularly, and does the job as same as a legitimate software would do. Is this possible? How do they bypass the activation key checker, and do that?
closed as not constructive by NULLZ, Adi, TildalWave, Gilles 'SO- stop being evil', Rory Alsop♦ May 29 '13 at 12:40
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Bypassing the activation key checker on any software usually isn't a problem. It's a relatively simple task of reverse engineering the binary and making the necessary modifications.
Can a cracked antivirus perform it's job? Yes, most definitely. The problem is that you have no idea what other modifications have been made to the binary in the process of bypassing the DRM. A rootkit or other sorts of malware could have been packaged with the antivirus binary for all you know.