Well, I wouldn't put it quite that way, but I think what you are saying is basically correct. When you purchase Terragen you get 1 year of Maintenance included. Maintenance gives you access to new releases during that period, as well as priority support access. Once your Maintenance runs out you can renew it (for much less than purchasing a new license, of course) and you will get another year of updates and support. The Maintenance renewals are not yet live in our online store, but we'll have that available very soon. I hope that answers your question.
By the way, this is really a question about Maintenance, not about the holiday sale. So in this case it might have been better to create a new thread titled something like "Question about Terragen maintenance policy" or something. No big deal, just something to think about for future posts.
- Oshyan