Just now came across BitDefender's facebook post, which says that BitDefender has released PC lifetime editions of their Antivirus and Internet Security products .

More info here :

Price :

Antivirus Pro - $59.95
Internet Security - $79.95

After browsing through that page, at last I found this in small letters :

*Lifetime protection key is valid for the computer you first install it on,
for the lifetime of the machine, not exceeding 5 years

**Save up to 70% per year. Calculation for 5 years of PC lifetime.
So, it is actually a 5 year license key. Sad to see Lifetime has a different meaning now