This summary is not the rule. The rule text controls.
If someone reveals private, protected information because a court wrongly forced them to, or because they didn't get a fair chance to object, that disclosure can't later be used against them in court.
This rule protects people who hold a legal privilege, like attorney-client privilege or doctor-patient privilege. Sometimes a judge might mistakenly order someone to share protected information, or the information might come out before the person even had a chance to speak up and say "wait, that's private." In situations like these, the rule says the disclosure doesn't count against the person who has the privilege.
In simple terms, this means a mistake by the court or a rushed situation won't cost someone their legal protections. If private information gets out because of an error or lack of opportunity to object, that information stays off limits and cannot be used as evidence later.