I said I would, right?

(local
  ; Correct answers' hashes, in original order.
  ; Determined by https://helmet.kafuka.org/sci/kq4_cp.html
  [answers 8] = [666 393 526 377 365 453 383 441]
)
 
(instance CopyProtection of Room
  (method (doit &tmp i ch hash myPick [yourAnswer 40])
 
    ; Just like in PQ2, we grab the current time, then mask out
    ; the lower bits to limit the range to a number from 0 to 7.
    (= myPick (& (GetTime gtTIME_OF_DAY) 7))
 
    ; Clear out the first character of our answer to effectively
    ; make it blank.
    (= yourAnswer 0)
 
    ; Request our input as before...
    (Print
      "TO: Detective Bonds\nFROM: Captain Hall\nSUBJECT: ID of evidence photo\n\nPlease provide the LAST name of the person pictured in the attached evidence photo for homicide case 186751.\n\nPlease respond in box below, ASAP!\n"
      #icon 701 0 myPick
      #edit @yourAnswer 20
    )
 
    ; Now we use some trickery from KQ4, but different.
    (= hash 0)
    (= i 0)
    ; While the character at position i is nonzero...
    (while (= ch (StrAt @yourAnswer i))
      ; Anything between 'a' and 'z' gets turned to uppercase.
      ; We don't bother putting it *back* in yourAnswer though.
      (if (and (>= ch 97) (<= ch 122)) (= ch (- ch 32)))
 
      ; Add this value to our running total.
      (= hash (+ hash ch))
      (++ i)
    )
 
    ; Either the hash we calculated is the correct one, or
    ; we entered "bobalu".
    (if (or
          (== hash [answers myPick])
          (== hash 437)
        )
      (gRoom newRoom: 1) ; or wherever your game starts.
    else
      (Print "Sorry Bonds, you'll need to do better than that!")
      (= gQuitGame true)
    )
  )
)

And presto! I’d talk about some of the other games’ copy protection schemes but for example KQ5’s doesn’t pass the decompiler. Probably because of a difficulty involving endless loops. Still, feel free to suggest something.

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