Disclosed are an apparatus and method for managing a digital copyright on electronic publication (EPUB)-based content and an apparatus and method for providing EPUB-based content according to a user's right. An encryption unit of the apparatus for managing digital copyright generates encrypted unit files by encrypting a plurality of unit files included in content in the form of a compressed archive including the plurality of unit files with different encryption keys, stores the encrypted unit files in a content database, generates mapping data by mapping the encryption keys to pieces of identification information of the encrypted unit files, and stores the mapping data in an encryption key database. A rights management unit transmits an encryption key selected from among the plurality of encryption keys to a content provision apparatus, which decrypts the encrypted unit files and provides the unit files to a user, based on at least one of identification information of the user and identification information of the content included in an encryption key provision request message received from the content provision apparatus.