Information vedrørende forskellige leverandøreres EPUB-implementeringer, som ikke med garanti er indbyrdes kompatible.
<ref>[http://www.teleread.com/2010/07/12/epub-standard-is-not-really-a-standard-just-a-guideline/ July 12th, 2010, teleread.com: ePub standard is not really a standard – just a guideline] {{Webarchive|url=https://web.archive.org/web/20100815025503/http://www.teleread.com/2010/07/12/epub-standard-is-not-really-a-standard-just-a-guideline/ |date=15. august 2010 }}, Kommentar citat: "...I think you are being quite unfair to the IDPF. ePub is most certainly a standard, just as much as XHTML, CSS, and the other technologies it is based on are standards. The problem here is not the IDPF, the problem is the device and software manufacturers who are not following the standard properly, and who are trying to hack the standard...For example, Adobe...Also for example, Apple...These and many other issues are what break ePub books, not the IDPF..."EpubCheck development was largely done at Adobe Systems."...Epubcheck is NOT the end-all-be-all of epub quality assurance..."</ref>
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