In TrackMania every track carries name of it's creator,and creator can decide to put password on track,which prohibits to edit it and servers has option to allow or disallow visitors to save the track.
Well,could be an idea for layouts in LFS.
Anyway,I've never created any layout which I didn't want to share,always had the opinion - you like it,take it,and it's nice if you credit me for it,if not,it's ok too...