Just like @James said, a CloneDVD license doesn't expire. In my case, I'm a prime example. I first bought a CloneDVD license way back in 2006, and then bought 4 more (1 for a family member) from 2007 to 2010, all of them bought and paid for from when Slysoft existed. Luckily, I kept my original email(s) with the CloneDVD license attached to said email(s), and then I backed up the licenses into a Google Drive account, so that I'll never have to re-purchase CloneDVD again.
I had clond dvd anydvd & clone cd but lost my liscense keys & they won't replace them.. Remember how cheap they were???