More accurately, the subscription is for the TSN, which is stored on the Crypto Chip of the main board, and that is referenced to the subscription status on the TiVo servers.
So long as you can keep that board running, or move the crypto chip to an operable board, its subscription status can be retained.
Series 2 234 Hr Lifetime.
Window XP and Ubuntu Linux on my PCs.
Watching more and more in HD direct now.