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The ePub Format
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Furthermore, in contrast to the PDF format, it offers reflowable and resizeable text. It also includes raster and vector images and CSS styling.
Ebook readers which support ePubMost of the common ebook readers support the epub format. Here the compability of various devices:
DRM layersSome ePub files may contain a additional DRM layer. DRM stands for Digital Rights Management and imposes a constraint on affected files to prevent them from being read by any software or on any portable device. For the moment there are competing standards which may cause confusion and problems to migrate ePub files between different reading systems. The most common standard is the Adobe Content Server which is supported by Adobe Digital Editions. However, there some more standards available like FairPlay or Lektz DRM.
Current versionThe current version of the ePub format is ePub 3.0 and was introduced in 2011. It replaced ePub release 2.0.1 and brought some mayor improvements which are described on the IDPF webpage in more detail.