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.

Unity says only initial install will require fee, unless game is installed on another device Demos will be largely exempt and developers will be able to inform Unity ...

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.