This is a portion of the VB email I rec'd from them. So I'm I reading this correctly? When my license experinced with 4.0 and they've upgraded, I have to purchase the entire upgraded serious again?

I'm probably not reading it right am I?
"You have the option to keep your current active license until it expires
(according to the 12 month term and conditions). For the remainder of your
active license, you will continue to receive support and have access to forum
software updates, including vBulletin 4.0 Forums. Once your license expires you
will only be able to access the 4 Series software updates by switching to the
new one-time owned license. For more information, visit the vBulletin FAQ."