The Huygens system ID (sysID) is a code that identifies your computer like a fingerprint. It enables us to generate a License String for you to use the HuygensSoftware.
The system ID is a series of 16 hexadecimal digits. It does not contain any personal information, it is generated based on some hardware and operating system serial numbers. It looks like
The unique system ID of your computer is displayed in the Help → About dialog of Huygens Essential or Huygens Professional. Send it to license at svi.nl and you will be provided with a License String. To prevent any typing error use the copy button to copy the ID to the clipboard and paste it into an e-mail.
Notice again that this ID is generated based on serial numbers of some of your hardware components. If you change any of these the System ID may change, and the License Strings generated for it no longer work. A typical problem is caused by the change of a Network card. Consult your maintenance contract and Contact SVI to see how to update your license strings in such a case.