Classified National Security Information Protection Act Article 39

Information previously classified under other Act before this Act comes into effect, shall be reclassified under this Act at the time this Act has come into effect for two years.
中文原文 國家機密保護法第39條
本法施行前,依其他法令核定之國家機密,應於本法施行後二年內,依本法重新核定,其保密期限溯自原先核定之日起算;屆滿二年尚未重新核定者,自屆滿之日起,視為解除機密,依第三十一條規定辦理。

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