Kinect Adventures -region Libre- -iso- High Quality

: Steer a raft through rapids by shifting your weight and jumping to grab emblems.

If you have stumbled across this term in forums, torrent indexes, or backup manager lists, you are likely looking at a specific disc image (ISO) of the game modified to bypass regional locking. But what does "Region Libre" actually mean? Is it legal? And how do you actually run this file? Kinect Adventures -Region libre- -ISO-