The Mikribot User's Manual - The !secure Command                 
Usage: !secure <secure level>
Userlevel required: 150
Purpose: !secure Changes security level. Valid security
levels are 0-3.  The security levels are as follows:
Security levels
  0 = No functions require authentication and high ops are
      autopped.
  1 = Bots require a passwd to op and perform important
      functions.
  2 = Bots do not allow ops to op other users, but they
      autoop other bots.
  3 = Bots do not allow ops to op other users, they must op
      themselves by using the bots.