Enforcement Rules of the Classified National Security Information Protection Act Article 15

Classified information which is to be submitted to the Legislative Yuan for prolonged classification in accordance with the provisions set forth in Article 11, Paragraph 5 of this Act, shall be delivered to the Legislative Yuan six months prior to the date of declassification. If the Legislative Yuan fails to agree to prolong the classification upon reaching the date of declassification, the information shall be declassified immediately.
中文原文 國家機密保護法施行細則第15條
依本法第十一條第五項後段規定送請立法院同意延長國家機密開放應用期限者,應於期限屆滿六個月前送達立法院。
立法院於期限屆滿時仍未為同意之決議者,該國家機密應即解除。

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