If you ? Let's do rot13 first: "qnwat tljram alab mhkrh" rot13 → "dajng gyewnz nyno zxueu" — nonsense.
Another guess: maybe it's an anagram of "watermark plan blah" etc. qnwat tljram alab mhkrh
Try a different cipher — on the whole phrase (A↔Z etc.): If you
q ↔ j n ↔ m w ↔ d a ↔ z t ↔ g (space) t ↔ g l ↔ o j ↔ q r ↔ i a ↔ z m ↔ n (space) a ↔ z l ↔ o a ↔ z b ↔ y (space) m ↔ n h ↔ s k ↔ p r ↔ i h ↔ s qnwat tljram alab mhkrh
Another common approach: . Try reversing the entire string: