I expect it will be the obvious answer, but here are two hypotheticals with the answers I expect:
A hobyist wants to create a clone of the smash hit, sheep herder, and offer it on the Apple iStore for free...
Personal iOS licence?
said hobyist wants to charge $1.00 for the game...
Commercial licence with additional iOS add on?
While i realise the obvious answers are those above

and I appologise in advance for my spelling
