Possible Clues:

• Secrecy contract
• Confidentiality document
• Doc that keeps someone's lips sealed
• Doc intended to protect confidentiality
• Contract that may prevent bad PR
• Document signed to protect secrets (Abbr.)
• Document that prevents leaks, for short
• Confidential contract, for short
• Confidentiality document, and a word in this clue rearranged
• Confidentiality contract inits