What will happen to intellectual property rights after the United Kingdom leaves the European Union and the end of the transitional period?

On 31 December, the transitional period of the Withdrawal Agreement 2019/C 384 I/01 regarding the withdrawal of the United Kingdom from the European Union ends. What scenarios may come up as of 1 January 2021? Elisenda Perelló, lawyer of the Intellectual and Industrial Property Department summarizes them in this article published on Lawyerpress.