Game engine Unity has announced it will begin charging developers a fee every time a user installs their game. That's even if someone's just installing games they already own on a new computer.

In an industry where customers are slow to trust and quick to criticize, a new fee from Unity infuriated studios that use its platform. By Mike Isaac and Kellen Browning Reporting from San Francisco ...

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.