I like DxO's model, which is "buy once and receive updates for a while". Minor bug fixes appears to continue for about a year, while major feature updates requ

I like DxO's model, which is "buy once and receive updates for a while". Minor bug fixes appears to continue for about a year, while major feature updates requires buying new versions. This model means I get to choose when to upgrade (and thus when to pay), and it's one reason why I use their software instead of Adobe's.