How do I license a game engine?

After researching something along the lines of "Game Engine Licensing" in the R&D Lab, I gained access to research an SDK (Software Development Kit). I created a new game engine with this feature in it, but nothing seems to have happened...

How do I license my new engines, and what does that do for me?

Solution 1:

Licensing a game engine will happen automatically for a period of time after creating a new game engine with the SDK selected as one of the engine elements.

You will receive a payment on a monthly basis for " SDK" in addition to any income from Grid (if you completed it) and game sales.