abstract ;;Quote: IX is a multilevel-secure UNIX; security labels on all files and processes, private channels, mandatory access control, no super-user

abstract+;;Quote: IX protects information from automated theft by unauthorized users and from accidental disclosure; allows some out-of-band leaks

675 ;;Quote: an unprivileged process can only cause upward data flow that remains below all pertinent ceilings; enforce by rules on security labels

678 ;;Quote: security labels in IX give lattice value (bit vector), privilege, fixity, and yes/no; occupy appreciable space, and take time to compare