Regarding DNA licenses, I know that there are 3-year licenses. After these 3 years, what happens? If I don't purchase a new license, will the hardware stop working? If we purchase a lifetime license for a Hardware, if the Hardware becomes defective a...

Regarding SNTC, if we purchase 10 units of Hardware, to support all 10 units of Hardware would it be enough to purchase 1 unit of SNTC or should we purchase 10 units of SNTC?