Lets say i purchase extended license of codecanyon (Slider Revolution, Visual Composer) for one my item in themeforest, example “X Theme”. My “X Theme” has sold 2 sales. Is i have to purchase 2 extended license or i only need purchase 1 license for 1 theme & get unlimited sales?
The most important thing is to get permission from the author of the plugins before you can include anything in your item.
you have to purchase 1 extended license per theme and must have to get permission from the plugin author to use it in your theme (to be sold).