Enforcement Rules of the Classified National Security Information Protection Act Article 33

Classified information that is marked for automatic declassification in accordance with the provision set forth in Article 27 of this Act, is declassified accordingly without notification to the relevant agencies.After information is declassified automatically, the original declassification authority shall publish the reasons for declassification.
中文原文 國家機密保護法施行細則第33條
國家機密依本法第二十七條規定自動解除者,無須經原核定機關或其上級機關之核定或通知,該機密即自動解除。
前項情形,原核定機關得將解除之意旨公告。

English translation for reference only; the Chinese text prevails. Not legal advice.