Courtyard is the area that provides a minimum electrical and mechanical clearance around a component.
In the Pattern Editor under “Objects - Place Outline” there is an special feature that helps draw a Courtyard fast and easy.
In the PCB Layout, you can mark "Check Courtyard" option in the DRC for the software to report the crossed courtyards.
See more information in:
Pattern Editor Help, page 22
PCB Layout Help, page 189