1. the full and correct name of the legal person of the parties (as registered and included in the instrument of incorporation, social contract or any other relevant document); An NDA is a contract. Each contract needs a preamble identifying the legal persons. It sounds simple, but it`s easier said than done. Here are three of the most common mistakes made with respect to DDAs: (2) the effective date of the NDA (the date from which disclosures are covered by the NDA`s confidentiality obligations); Whether the company executing the NDA provides or receives confidential information as part of the signing of an NDA is an appropriate question. It is important that the legal persons mentioned in the preamble to the NDA that implement the NDA are the ones that will exchange confidential information. .