Ignore him. Real lawyers don't get illegal property by threatening others. It is not easy to qualify as a lawyer. If you cheat someone's property, he will commit a crime, go to jail, and of course his license will be revoked. That Zuo's law poem can't be a lawyer's. "Shanghai Xiebang Zuoshi Law Firm" does not exist at all. You can go to the National Lawyers Management Data Center for your own inquiry, where there is information about all practicing lawyers in China.
/lawyer manager/lawyer search _ bj/lawyer _ search . JSP
Of course, your act of selling pirated copies is also infringement, and a certain amount constitutes a crime. Don't do such illegal things in the future.