证书管理机构是认证机构的国际通称，它是对数字证书的申请者发放、管理、取消数字证书的机构。CA的作用是检查证书持有者身份的合法性，并签发证书（用数学方法在证书上签字），以防证书被伪造或篡改。
扣留证书期满后，海事管理机构应将所扣证书发还当事人，也可以通知当事人领取被扣证书。
Upon expiration of the detaining, the maritime administrative agency shall return the detained certificate to the party, either may it notify that party to draw the said certificate.
然后持批准证书，向原登记管理机构办理变更登记手续。
The procedures for amendment of registration shall then be carried out with the original registration authority by presenting the new certificate of approval.
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