The Ship Registration Law Article 59

If the right of mortgage or leasehold is exterminated pursuant to laws, the deletion of the registration of such right shall be made through an application by the obligee of mortgage or leasehold jointly with the obligor of mortgage or leasehold to the competent authority, furnishing the Certificate of Registration of mortgage or leasehold. However, if the right of mortgage or leasehold is exterminated pursuant to a court decision, only the obligor of the mortgage or leasehold may apply for such deletion of registration.
中文原文 船舶登記法第59條
抵押權或租賃權依法消滅時,由抵押權或租賃權權利人會同抵押權或租賃權義務人向主管機關申請抵押權或租賃權註銷登記,並繳還抵押權或租賃權登記證書。
但抵押權或租賃權依法院裁判消滅者,得僅由抵押權或租賃權義務人申請註銷之。

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