Confidentiality in IATF 16949

Answer:

The standard requires organization to ensure confidentiality of the customer-contracted products and projects under development, including related product information. The standard does not specify what kind of protection of the information should be applied and in most cases it is either defined by the customer or usual confidentiality rules of the company are applied.

As far as documenting the requirement in the manual goes, you should explain what rules for confidentiality your company applies and who is responsible to enforce those rules.