legal ground
Article 444 of the Civil Code of People's Republic of China (PRC)
Where the right to exclusive use of a registered trademark, patent right, copyright and other intellectual property rights are pledged, the pledge right shall be established at the time of pledge registration.
After the pledge of property rights in intellectual property rights, the pledgor may not transfer or license others to use them, unless the pledgor and the pledgee agree through consultation. The pledgor shall pay off the debts in advance to the pledgee or deposit the price for transferring or allowing others to use the pledged intellectual property rights.