The engine is designed by Fiat. During their alliance with GM, the design was given to them. GM in turn passed it on to Suzuki (as GM holds a stake in Suzuki). This is how Maruti is manufacturing this engine for its cars. Fiat makes the engines in it's plant for use in Fiat and Tata cars. Now that the Fiat GM alliance is over, there is no way Maruti can get the licence to manufacture the upgraded versions.