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Broadly speaking, a security breach is a violation of any policy or law that is designed to secure something. When people or vehicles bypass screening checkpoints, or enter secure buildings without presenting the appropriate credentials, security breaches are generally obvious. Less obvious are security breaches that involve data or information. In a data context, a security breach is any activity that compromises the confidential nature of certain information. Most of the time, what is or is not a security breach is defined by law. Statutes in many countries set out security measures for any number of things, from border crossings to data sharing and electronic commerce transactions. A breach is usually defined as any action, intentional or otherwise, that weakens a certain defined security interest. The best-known security breaches typically cause some noticeable harm. An airport security breach that allows a passenger to board a plane with a weapon, or a data loss that leads to identity theft are clear examples. Under most security breach laws, however, harm is not always a requirement. The threat of harm, or likelihood of harm, is usually enough.