Product keys are very similar to serial numbers as both are used to activate the Golden Software product.
Towards the end of 2016, Golden Software made a change to the way some of our products are licensed. If you purchased either Surfer or Grapher prior to December 2016, you most likely have a serial number. If you purchased after December 2016, you will have a product key.
Product keys are in the form XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
Serial numbers are in the form XX-XXXXXX-XXXX
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