legal ground
Article 394 of the Civil Code
In order to ensure the performance of the debt, if the debtor or a third party mortgages the property to the creditor without transferring the possession of the property, if the debtor fails to perform the due debt or realize the mortgage according to the agreement of the parties, the creditor has the right to be compensated in priority for the property.
The debtor or the third party specified in the preceding paragraph is the mortgagor, the creditor is the mortgagee, and the property that provides guarantee is the mortgaged property.
Article 4 of the Measures for the Registration of Copyright Pledge
Where the copyright is pledged, the pledger and the pledgee shall conclude a written pledge contract, and both parties shall register the copyright pledge with the registration authority.
The pledgor and the pledgee may handle it by themselves or by entrusting an agent.
Article 5
The establishment, alteration, transfer and extinction of the copyright pledge shall take effect when it is recorded in the copyright pledge register.