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A public interest defence is a defence in law that allows a defendant who disclosed classified or protected information to avoid criminal or civil liability by establishing that the public interest in disclosure of the information outweighs the public interest in nondisclosure.
In the context of secrecy laws, it may permit a whistleblower to disclose government misconduct.
In the context of journalism, publication of a story that the journalist reasonably believes to be true "having regard for all the circumstances", even if subsequently found to be untrue, is protected against action for defamation in UK law.[1]
In the United Kingdom, the Defamation Act 2013 provides a public interest defence.