Do confidential documents need to be marked with an asterisk without a confidentiality period?

Confidential documents are marked with an asterisk, not the period of confidentiality. Because the confidentiality period of confidential documents is one year or more, it is counted as a whole year and marked as "Confidentiality ★xx years". For example, a top secret state secret can only be decrypted after 5 years from the date of production, and the symbol of the carrier of the matter is "confidential ★5 years". If the confidentiality period is less than one year, it shall be counted as a whole month and marked "Confidentiality ★xx months". Therefore, confidential documents are marked with an asterisk instead of the confidentiality period.