In light of the popular suing culture, indemnity forms will have to be signed when entering any parks and when undertaking any activities on your tour. These usually state that the tour operator or lodge/park personnel are not, under any circumstances, liable for whatever may happen. If you refuse to sign the indemnity form, you will be denied entrance or participation in the activity, so there really is no choice but to sign the form. This may sound annoying, but is the order of the day.
It is worth remembering that, should something happen to you as a result of the negligence of the tour operator or lodge/park personnel, these signed documents won't stand in court.
Indemnity forms are simply there to dissuade people from laying unsubstantiated claims against operators and personnel as it is thought that 9 out of 10 people will not see fit to open a trivial lawsuit if they have signed an indemnity form. Everyone is protected under international law: an organisation/person can always be sued if they really behave in a negligent manner and it results in injury. So please, do not worry about signing indemnity forms.
Download here an example of what Indemnity forms looks like.