Keyloggers, Keyloggers

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Some of this type of software use "signatures" from a list of all known keyloggers. The PC's legitimate users can then periodically run a scan from this list, and the software looks for the items from the list on the hard-drive. One drawback of this approach is that it only protects from keyloggers on the signature-based list, with the PC remaining vulnerable to other keyloggers.

Some heuristics-based anti-keyloggers have the option to unblock known good software, but this can cause difficulties for inexperienced users.

Source: Wikipedia > Keystroke Logging