Administrative Regulations on the Establishment and Operation of Dedicated Telecommunications, and the Connection of Dedicated Telecommunications to Public Communication System Article 9

The license shall be valid for three years.If the Station continues to operate after its license expires, the applicant shall apply to the competent authority for renewal of the license within one month prior to the expiration date of the license. The valid period of renewal license takes effect from next day of the expiration date of the license.With the license lost, damaged, or its content changed, the licensee shall apply for replacement, renewal or correction of the license. The valid period of the license shall be the same as the original one.
中文原文 專用電信設置使用及連接公共通信系統管理辦法第9條
執照有效期間為三年。
執照之有效期間屆滿後電臺仍需繼續使用者,應於期間屆滿前一個月內向主管機關申請換發執照,其有效期間自原執照期間屆滿之次日起計算。
執照遺失、毀損或執照內所載事項有變更時應即報請補發、換發或註記更正。
其有效期間與原執照相同。

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