Apparatus and method for managing digital copyright on EPUB-based content, and apparatus and method for providing EPUB-based content according to user's right

1. A method of managing digital copyright performed by an apparatus for managing digital copyright, the apparatus comprising a processor, an non-transitory, computer-readable recording medium and computer-readable codes stored in the computer-readable recording medium and executable by the processor, the method comprising:

separating unit files, which are components of content in the form of a compressed archive including an electronic publication (EPUB) content, into the form of streams;

generating encryption keys corresponding to the separated components, the separated components being encryption targets;

encrypting the components in the form of streams with the generated encryption keys, wherein the encryption keys used for encryption are stored in an encryption key database together with identification information of the corresponding components;

structuralizing the encrypted streams according to the structure of the EPUB standard when encryption of all the components of the EPUB content is completed; and

storing the structuralized streams in a content database.

2. A method of providing content, performed by a content provision

apparatus which includes a processor, a non-transitory, computer-readable recording medium and computer-readable codes stored in the computer-readable recording medium and executable by the processor, the method comprising:

transmitting an encryption key provision request message for using to decrypt an electronic publication (EPUB) content to a digital rights management (DRM) apparatus managing a content database via a network based on an access path to the DRM apparatus in an “encryption.xml” file included in the EPUB content without being encrypted, wherein the encryption key provision request message includes at least one of content identification information and user identification information;

receiving a license issued by the DRM apparatus;

extracting encryption keys and rights information from the issued license; listing encrypted components of the EPUB content in display order of the components set in advance as an open packaging format (OPF) file in the EPUB content;

decrypting the encrypted components with the encryption keys in list order; and

rendering the decrypted components and outputting the rendered

components to a display device of the content provision apparatus, wherein the outputted components are whole or a part of the EPUB content according to the user's access rights in stages of the outputting.

3. The method of claim 1 , further comprising:

after the storing the structuralized streams,

receiving an encryption key provision request message for decrypting the EPUB content from a content provision apparatus via a network;

determining a user's access right to the EPUB content based on at least one of content identification information and user identification information included in the encryption key provision request message;

adaptively selecting encryption keys to be provided to the user by the encryption key database according to the user's access right, wherein when the user has an access rights to only a part of the EPUB content, only encryption keys corresponding to components of the corresponding part are selected;

encrypting the selected encryption keys and inserting the encrypted encryption keys in a license together with information on the corresponding components and information on the user's usage rights of the content, wherein a process of the encrypting an encryption key and the inserting the encrypted key in a license is performed for each of the selected encryption keys in sequence;

encrypting the license when all the selected encryption keys are inserted in the license; and

transmitting the encrypted license to the content provision apparatus.