What does Node-Locked dongle mean? Is it difficult for hacker?

It can be assumed that there are sophisticated means out there to clone the USB dongle, even the high end dongles. The availability of such scenario would also depend on the expertise, cost, .... That's why we offer the node-locked dongle that must be initialized and tied to a specific machine before use. The initialization saves the machine hardware signatures to the Key on the USB dongle, which will be verified when the protected application detects the Key. This will make the cloned dongle useless because it can only work on one single machine.