Robert Swetz has been (WaterMarking) his photographs loaded to the World Wide Web

 For the last 12 months now Robert Swetz has been (WaterMarking) all his photographs that are being loaded to the World Wide Web.
 In fact for the last 6 months Robert has been pulling his photos from the WWW that don't have (WaterMarks) and attaching one and then posting them again.
What Robert has noticed is after a couple months the photos with the WaterMarks push out and over power the same photos that had no Marks ... 

BONUS ... ;o)