外泄

zhī qíng zhě duì nèi bù jī mì yīng gāi yán gé bǎo shǒu bù dé wài xiè

知情者对内部机密应该严格保守，不得外泄。

People in the know must strictly protect and not leak internal secrets.

rú fēi bì yào shēng chǎn guò chéng jué bù wài xiè

如非必要，生产过程绝不外泄。

Access to the manufacturing process is on a strictly need-to-know basis.