Dave Was Injured in a Hang-Gliding Accident at a Hang-Gliding

True/False

Dave was injured in a hang-gliding accident at a hang-gliding school and would like to sue the owners of the school. Before they would allow him to take classes, the owners of the school had Dave sign a document which said that the school would not be responsible, legally or physically, for Dave's safety. This kind of document is called a waiver.