This is a contract by which the parties agree not to disclose the information covered by the agreement. An NDA creates a confidential relationship between the parties, usually to protect any type of confidential information and proprietary or trade secrets. Therefore, an NDA protects non-public business information. Like all treaties, they cannot be applied if the contractual activities are illegal. DDNs are often signed when two companies, individuals or other entities (such as partnerships, companies, etc.) are considering doing business and need to understand the processes used in the other`s activities to assess the potential business relationship. The usual duration of a confidentiality agreement is between one and three years and includes activities on which the former employee can no longer work.