Chanserv, DALnet's channel registration service, supplies users with a way to secure their channels from takeovers. Founding a channel gives a user the right to add and remove ops and akicks, lock channel modes, etc.
When a channel is set +i (invite) or +k (requires key), a user is able to join the channel when invited. However, a user with AOp or higher status is able to have ChanServ invite them.