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EPUB is an e-book file format that uses the ".epub" file extension. The term is short for electronic publication and is sometimes stylized as ePUB . EPUB is supported by many e-readers , and compatible software is available for most smartphones, tablets, and computers.
It is a proprietary format, but some reader software for general-purpose computers, particularly under Linux (for example, Calibre's internal viewer [2]), have the capability to read it. The LRX file extension represents a DRM-encrypted e-book. More recently, Sony has converted its books from BBeB to EPUB and is now issuing new titles in EPUB.
The most common file format is .epub, used in many e-book formats. .epub is a free and open standard available in many publishing programs. Another common format is .folio, which is used by the Adobe Digital Publishing Suite to create content for Apple's iPad tablets and apps.
Calibre is a cross-platform free and open-source suite of e-book software. Calibre supports organizing existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers.
The digitization at the most basic level is based on page images of the physical books. To make this book available as an ePub formatted file we have taken those page images and extracted the text using Optical Character Recognition (or OCR for short) technology. The extraction of text from page images is a difficult engineering task.
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]
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The software supports EPUB and PDF (nonproprietary file format for reflowable text, or fixed layout e-books; respectively). It implements a proprietary scheme of digital rights management (DRM) which, since the version 1.5 release in May 2008, allows document sharing among multiple devices and user authentication via an Adobe ID.