Confidentiality agreements are very useful to prevent unauthorized disclosures of information, but they have inherent limitations and risks. Start and End Dates of the Partnership: Your NDA can't take effect if you never specify the agreement's start or end dates.BioSpace has provided a guide to confidentiality agreements and severance packages so you can feel confident making your next career move. NDAs, or non-disclosure agreements, are legally enforceable contracts that create a confidential relationship between a person who has sensitive information. Typically, NDAs prohibit employees from disclosing specific confidential information they learn or have access to while they are employed. The potential effects of including an expiration date in an NDA clearly should be considered when drafting the agreement.