Pah doQ cha

From Memory Alpha, the free Star Trek reference

pah doQ cha is a high-level Klingon security clearance.

Ambassador K'Ehleyr possessed pah doQ cha clearance and attempted to use it to gain access to High Council files on the Khitomer Massacre from the Klingon Imperial information net. Her access was denied because the files had been restricted to du-ko-cha clearance or higher. (TNG: "Reunion")