See:
UTM 9 to open source after EOL ?
Whats the status of :
That makes sense. We will certainly give that some consideration. I believe it really only applies to Software licenses - SG Appliance licenses allow the customer to continue accessing the UI after subscriptions expire.
Obviously, the best approach is for customers to use the next 3 years to make sure they are prepared for the end-of-life, but I know from personal experience that things don't always work out that way ;-)