Generally speaking, a nondisclosure agreement (NDA) is a contract in which a party (normally an employee) promises to protect the confidentiality of a secret that is disclosed to him or her during the course of their employment, or during another business transaction.
If you have a nondisclosure agreement with someone who then later uses your secret information without your authorization, you can make a request to a court to stop the person from violating the nondisclosure agreement. In addition, you can often sue the offender for any damages you suffered as a result of the breach of confidentiality.
The use of nondisclosure agreements within employment contracts has grown in tandem with the growth of the high tech and information-based fields. If you have questions related to the enforcement of a NDA, contact an attorney for additional information regarding your particular circumstances.