Is there a way to read product key from API?

[adam.krug]

To read Revit's serial number from API we can reference UIFrameworkServices.dll and use InfoCenterService class.

But how about the product key? Is there any way to read it from the API?

[jeremytammik]

I was surprised that you also brought up UIFrameworkServices today, after it was just mentioned in another thread. .

Then I noticed that the approach you describe was already mentioned by The Building Coder back to Determine Revit Demo Mode and Serial Number: 

https://thebuildingcoder.typepad.com/blog/2013/01/determine-revit-demo-mode-and-serial-number.html

  
Reference the UIFrameworkServices.dll assembly and read the Revit serial number with the InfoCenterService class static method ProductSerialNumber.

However, just off the top of my head, I would assume that the product key is inaccessible and carefully protected.