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The description of epub format expansion

File format epub
File type:

The epub file is a digital electronic book stored via the EPUB algorithm, an open XML-based mechanism for digital publications and books. It provides an ordinary format specified for digital publications and intended to the consumers and publishers. EPUB-files can be opened with supporting hardware devices, such as the Sony Reader and PocketBook, and software programs.

The EPUB extension is related to three open-based standards, which are all supported by the International Digital Publishing Forum (IDPF):

  1. The Open Container Format (OCF), that makes a single package out of all the the ebook files into a compressed view;
  2. The Open Packaging Format (OPF), that makes a description of the whole ebook structure;
  3. The Open Publication Structure (OPS), which makes a definition of the content markup.

A lot of commercial books contain digital rights management (DRM) protection. Those file objects can only be revealed on gadgets that have been authorized for the ebook viewing.