Library Science · Five Laws of Library Science

A new student visits the library and finds that books are stacked in locked cupboards, making it difficult for users to freely access them. The librarian insists that only staff members can retrieve books, leading to long waiting times and restricted access. The student suggests that library materials should be easily available for all users without barriers. Which law of library science emphasizes this importance of open access to library resources for users, historically summarized as 'Every book its reader'?