includes/class-freemius-abstract.php
function is_plan__premium_only( $plan, $exact = false ) {
			return ( $this->is_premium() && $this->is_plan( $plan, $exact ) );
		}
function is_plan__premium_only( $plan, $exact = false ) {
			return ( $this->is_premium() && $this->is_plan( $plan, $exact ) );
		}
function is_plan__premium_only ( $ plan , $ exact = false ) { return ( $ this -> is_premium ( ) && $ this -> is_plan ( $ plan , $ exact ) ) ; }
All code wrapped in this statement will be only included in the premium code.

@since  1.0.9

@param string $plan  Plan name.
@param bool   $exact If true, looks for exact plan. If false, also check "higher" plans.

@return bool
All code wrapped in this statement will be only included in the premium code .