While Angry Birds and many of its spawns have been launched in China, this is the first time Rovio Entertainment has allowed a Chinese developer to make games based on the Angry Birds IP. Kalends (also known as Kunlun), has signed a contract with Rovio to develop its own iOS and Android games based on Angry Birds. Yes, big companies in China do follow IP laws these days.
The contract term will last from 3 February 2015 till 31 December 2017, around 3 years. During this period, Kalends will also be publishing the games developed with Rovio on the global market, China included of course. It was mentioned that Kalends will be getting 40% to 60% of the profits. Rovio is also currently building an Angry Birds theme park in Haining City, China.