The will make sure no one takes off those bans you want to keep on, not even owners can take it off.

on me:*:ban:#: {
  if ($banmask !iswm $ial($me)) {
    writeini -n bans.ini $chan $banmask 1
  }
}
on me:*:unban:#: {
  if ($readini(bans.ini,$chan,$banmask)) {
    .remini bans.ini $chan $banmask
  }
}
on !*:Unban:#: {
  if ($readini(bans.ini,$chan,$banmask)) && ($nick($chan,$me,oh)) {
    mode $chan +b $banmask
  }
}
on me:*:join:#: {
  mode $chan +b
  .timer 1 2 banlock_build $chan
}
alias banlock_build {
  var %x = 1, %y = $ibl($1,0)
  while (%x <= %y) {
    if ($ibl($1,%x).by == $me) writeini -n bans.ini $1 $+($1,.,$ibl($1,%x)) 1
    inc %x
  }
}
raw 367:*: halt
raw 368:*: halt

; ===========================================================
; For you who like a menu; here you go!
; ===========================================================

#banlock on
on me:*:ban:#: {
  if ($banmask !iswm $ial($me)) {
    writeini -n bans.ini $chan $banmask 1
  }
}
on me:*:unban:#: {
  if ($readini(bans.ini,$chan,$banmask)) {
    .remini bans.ini $chan $banmask
  }
}
on !*:Unban:#: {
  if ($readini(bans.ini,$chan,$banmask)) && ($nick($chan,$me,oh)) {
    mode $chan +b $banmask
  }
}
#Banlock end
#banlock_jcheck on
on me:*:join:#: {
  mode $chan +b
  .timer 1 2 banlock_build $chan
}
alias banlock_build {
  var %x = 1, %y = $ibl($1,0)
  while (%x <= %y) {
    if ($ibl($1,%x).by == $me) writeini -n bans.ini $1 $+($1,.,$ibl($1,%x)) 1
    inc %x
  }
}
raw 367:*: halt
raw 368:*: halt
#banlock_jcheck end
Menu * {
  .Ban Lock 
  ..Turn banlock $iif($group(#Banlock) == on,Off,On) : $iif($group(#Banlock) == on,disable,enable) #banlock 
  ..-
  ..$iif($group(#banlock_jcheck) == on,Disable,Enable) Banlock join update: $iif($group(#banlock_jcheck) == on,.Disable,.Enable) #banlock_jcheck
}

; ===================================================
; Yoinxs version
; ===================================================

on me:*:join:#: {
  mode $chan +b
  .timer 1 2 banlock_build $chan
}
alias banlock_build {
  var %x = 1
  while (%x <= $ibl($1,0)) {
    if ($ibl($1,%x).by == $me) hadd -m banlock $+($1,.,$ibl($1,%x))
    inc %x
  }
}
on me:*:ban:#: {
  hadd -m banlock $+($chan,.,$banmask)
}
on me:*:unban:#: {
  hdel -w banlock $+($chan,.,$banmask)
}
on !*:unban:#: {
  if ($hfind(banlock,$+($chan,.,$banmask),w,1)) || ($hfind(banlock,$+($chan,.,$banmask),W,1)) {
    if ($me isop $chan) || ($me ishop $chan) mode $chan +b $banmask
  }
}
raw 367:*: halt
raw 368:*: halt