Need-to-know

Information will be provided on a need-to-know basis.

Source: tatoeba (593664)

That's on a need-to-know basis.

Source: tatoeba (3727263)

Every morning an old 747 full of EU sperm donations takes off from London and lands in Toronto. This is information on a need-to-know basis.

Source: tatoeba (10727876)

10 to 2 a.m., X, Yogi DMT and a box of Krispy Kremes In my need-to-know post just outside of Area 51 Contemplating the whole "Chosen People" thingy When just a flaming stealth banana split the sky Like one would hope, but never really expect to see in a place like this

Source: wiktionary