Legal. According to the query "Implementation Opinions on Promoting the Library-to-School Communication Project of Wenzhou Public Libraries and School Libraries", it can be known that by the end of 2023, public libraries and primary and secondary school libraries will be interconnected, borrowed and returned, and meet the literature information needs of citizens, teachers and students. It is legal for libraries and educational institutions to borrow books in cooperation. A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education.