Is it permissible to listen to recorded lectures without the lecturer's permission, in order to avoid gender mixing at the university or in designated explanation venues that are highly expensive?

It is not permissible to copy books, lectures, and the like without the permission of their owners, though some scholars permit it if it is for personal use and not for commercial gain. Some are of the view that there is no harm in listening to recorded lectures without the permission of their owners, due to need.