Confidentiality agreements are very useful to prevent unauthorized disclosures of information, but they have inherent limitations and risks. The potential effects of including an expiration date in an NDA clearly should be considered when drafting the agreement.Personnel history files are confidential records and shall only be maintained in the Middlesex County Personnel Director's offices. To state the duration of any obligation, you have two choices. Sample Business Contracts. Learn about the scope, nuances, and limitations of confidentiality and nondisclosure agreements, and download a confidentiality agreement template.