Regulations on Required Information for Certification Practice Statements Article 31

A certification service provider shall specify the operational period of the certificates, whether the public key is archived, and the usage periods for the key pair.
中文原文 憑證實務作業基準應載明事項準則第31條
憑證機構應於其作業基準中載明憑證有效期限、公開金鑰是否歸檔及公開金鑰與私密金鑰各別之使用期限。

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