(registered 2014-11-06, last updated 2022-08-16) MIME media type name: application MIME subtype name: epub+zip Required parameters: None. Optional parameters: None. Encoding considerations: OCF ZIP container files are binary files encoded in the application/zip media type. Security considerations: All processors that read OCF ZIP container files should rigorously check the size and validity of data retrieved. In addition, because of the various content types that can be embedded in OCF ZIP container files, application/epub+zip may describe content that poses security implications beyond those noted here. However, only in cases where the processor recognizes and processes the additional content, or where further processing of that content is dispatched to other processors, would security issues potentially arise. In such cases, matters of security would fall outside the domain of this registration document. Security considerations that apply to application/zip also apply to OCF ZIP container files. Interoperability considerations: None. Published specification: This media type registration is for the EPUB Open Container Format (OCF), as described by the EPUB 3 specification located at https://www.w3.org/TR/epub-33/. The EPUB 3 specification supersedes both RFC 4839 and the Open Container Format 2.0.1 specification, which is located at http://idpf.org/epub/20/spec/OCF_2.0.1_draft.doc, and which also uses the application/epub+zip media type. Applications that use this media type: This media type is in wide use for the distribution of ebooks in the EPUB format. Additional information: Magic number(s): 0: PK 0x03 0x04, 30: mimetype, 38: application/epub+zip File extension(s): OCF ZIP container files are most often identified with the extension .epub. Macintosh file type code(s): ZIP Fragment identifiers: EPUB Canonical Fragment Identifiers are custom fragment identifiers defined for EPUB Publications. They may be used to refer to an arbitrary content within any publication resource defined for the publication. These identifiers are defined at https://idpf.org/epub/linking/cfi/. Person & email address to contact for further information: EPUB 3 Working Group (public-epub-wg&w3.org) Intended usage: COMMON Author/change controller: World Wide Web Consortium (W3C)