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Not all distribution channels that accept EPUB3 deliver actual EPUB3 files to consumers, and not all EPUB3 files can be read on different devices and software programs. Some content providers store EPUB3 files on their servers to enable online cloud based reading in browsers (Safari Books Online for example). Other (Amazon Kindle for example) convert EPUB3 files into their own proprietary formats and dont allow consumers to directly sideload EPUB3 files. Still others (such as Apple iBooks) apply a proprietary DRM Digital Rights Management technology that encrypts the content of an EPUB3 file such that it can only be read on the vendors own software and cant be sideloaded into other EPUB3 compatible reading systems note that while Apple doesnt make their FairPlay DRM available to 3rd-party reading systems, even on Apple devices and computers, Apple iBooks does allow users to sideload non-DRM protected EPUB3 files that come from arbitrary sources. Only the Embellisher (TM) ePub3 eReader has no such reader limitations.