DRC and courtyard outlines

How does Pcbnew DRC treat courtyard outlines? Does it check it at all and, if yes, how?

I know you have found the answer by now. For people who stumble on this conversation, here is the answer.

KiCad has front / back courtyard layer support.
They are enabled in Design Rules > Layers Setup.

The courtyard layers act as graphic layers.
In each of your components you draw lines defining the outline of the physical part.

As of today (KiCad version 4.0), the courtyard layers are informative only. No check is done by the DRC.
You are responsible of making sure that no two components overlap.

Here is the bug tracking the wish of automatic overlap detection by the DRC:

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