Classified National Security Information Protection Act Article 26

To depart from this country, the following personnel shall be subject to the approval of the head of the (original) institution employing the personnel or the entrusted institution, or the authorized personnel of the head of the institution:I. Personnel who may approve classified national security information.II. Personnel engaged in handling classified national security information and related matters.III. Personnel who were discharged from the duties as mentioned in the previous 2 sub-paragraphs or who have handled over classified national security information for less than 3 years.The duration as mentioned in sub-paragraph III of the previous paragraph may be extended by the classified national security information approval institution where necessary. The period of extension shall not exceed 3 years and only one extension is permitted unless the situations as prescribed in Paragraph 1 in Article 12 are applicable.The personnel listed in Paragraph 1 shall report to the (original) institution employing the personnel or the entrusted institution within seven working days after returning to Taiwan.
中文原文 國家機密保護法第26條
下列人員出境,應經其(原)服務機關或委託機關首長或其授權之人核准:
一、國家機密核定人員。
二、辦理國家機密事項業務人員。
三、前二款退離職或移交國家機密未滿三年之人員。
前項第三款之期間,國家機密核定機關得視情形延長之。
延長之期限,除有第十二條第一項情形者外,不得逾三年,並以一次為限。
第一項所列人員應於返臺後七個工作日內,向(原)服務機關或委託機關通報。

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