The wording of the licensing and "restore" process is kind of confusing in my opinion. The good news is, it all pretty much makes sense once you figure it out. Better yet, the licensing terms are extremely generous. You won't ever need to "re-buy your license". You're covered for life with the version you bought on a reasonable amount of computers. 3 computers is apparently pretty common and is definitely "reasonable".
If you have any further questions, please ask. I don't want to cover everything that's in the "Restore" link, but I'll answer any questions you have to the best of my ability. Plenty of other people are here to help you also.
Brian.