The dongle in a laser marking machine serves as a hardware protection device, typically a small USB key that, when inserted into the computer, ensures the proper functioning of the laser marking software and protects its intellectual property. The main functions of the dongle in a laser marking machine are:

1. Copyright Protection
   The control software for the laser marking machine is often a core technology developed by the manufacturer. The dongle prevents unauthorized users from illegally copying or distributing the software.

2. Authorization Verification
   The software checks whether the dongle is inserted to ensure the user has obtained legal authorization. If the dongle is not inserted or is invalid, the software may limit functionality or fail to run.

   
   

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4. Data Encryption
   Some dongles store specific configuration information or authorization codes that match the laser marking machine, ensuring that only the paired device can use the software.

5. Personalized Settings
   Some dongles store device serial numbers, parameters, or functional module authorizations, allowing users to configure different functionalities across multiple devices.

6. Tamper Prevention
   The dongle, through a combination of hardware and software, makes it more difficult to crack or reverse-engineer, effectively preventing unauthorized modifications to the software.

Overall, the dongle is designed to protect the intellectual property of the laser marking machine software while ensuring the legal and proper use of the equipment. If lost or damaged, a new dongle may need to be obtained from the supplier, or reauthorization may be required.