The ePUB file type is an open source format developed by the International Digital Publishing Forum (IDPF) . Based on XHTML, XML and CSS it works well with a number of software applications which has helped the popularity of the format grow. Despite this, there are a raft of rules that must be adhered to when creating an ePUB file which has attracted criticism of the format. The format allows DRM protection to be added to a file.
The ePUB format allows reflowable content. This means that the content fits the size and shape of the screen it is being displayed upon, in the same way that text on an HTML page changes depending on the size of the display. An ePUB file tends to consist of three elements: archive, metadata and content.
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The .oeb file extension was created for use in accordance with the Open eBook Standard which was overseen by the Independent Digital Publishing Forum (IDPF). This is now a legacy format, having been superseded by the epub file type.
Based on XML, the oeb file defines how multiple sources should be ordered and arranged into a single electronic delivery for the user to consume. This means that there Is one file to be transferred between the vendor and customer rather than multiple files. The file type permits the use of DRM protection. The format was designed to be open and easily used by any online bookstore.