The Key is (((+)))

It's an XY axis

the clue is the NPC meme if you shift everything +1 you get the word MOB

In 2001 the Hal 9000 was a dig on IBM

HAL shifted one place is IBM

The key to unsealing the classified documents is plotting the alphabet on an XY axis graph and shifting some or all of the bracketed [ ] letters in the Q drops +1,+2, -1, -2 whatever

I am not a mathfag by nature but I guess there is an algorithm that works to help paint the picture