Your $70 buys you everything in ODNT, and any major new versions that come out within a year of your purchase. After the year is up, you keep access to the stuff that you had, and get only the free minor updates to those versions.

For example, Windowblinds 6 is out now. If WB7 were to come out in April of next year, then you would get it and any future updates made in the WB7 line (even if the updates come after your subscription expires). But if WB7 came out after your year was up, then you would have only WB6 and its updates unless you choose to resubscribe to ODNT.

(Note to anyone who may assume otherwise, this is just an example, I have no idea when WB7 would be made! )