For years, the Unity Engine has earned goodwill from developers large and small for its royalty-free licensing structure, which meant developers incurred no extra costs based on how well a game sold.

BEIJING, Aug 9 (Reuters) - Unity Software Inc (U.N), opens new tab, the U.S. developer whose software is used in video games like Tencent Holdings' (0700.HK), opens new tab "Honor of Kings", said on ...