The Contest password is a password required to start a pc2 server/contest.
The password is used to decrypt and give access to contest data.
To extract contest data using pc2report the Contest password must be used.
Upon starting the Primary server the Contest password is entered. This password is used to help encrypt all contest data files (submissions, Languages, Problems, Accounts, Contest Clocks, Judgements, Site connection information, etc) on all servers.