A non-disclosure agreement (NDA), also known as a confidentiality agreement (CA), confidential disclosure agreement (CDA), proprietary information agreement (PIA) or secrecy agreement (SA), is a legal contract between at least two parties that outlines confidential material, knowledge, or information that the parties wish to share with one another for certain purposes, but wish to restrict access to or by third parties.
Non-disclosure agreement (NDA), též CA (confidentiality agreement), CDA (confidential disclosure agreement), PIA (proprietary information agreement) nebo SA (secrecy agreement) je smlouva mezi alespoň dvěma stranami o sdílení důvěrných materiálů, znalostí nebo informací, které však nebudou sdíleny s jakoukoliv třetí stranou.