The key IDPF standard is EPUB®, the current version is EPUB 3.1.

EPUB is the distribution and interchange format standard for digital publications and documents based on Web Standards. EPUB defines a means of representing, packaging and encoding structured and semantically enhanced Web content — including XHTML, CSS, SVG, images, and other resources — for distribution in a single-file format.  EPUB allows publishers to produce and send a single digital publication file through distribution and offers consumers interoperability between software/hardware for unencrypted reflowable digital books and other publications.

The community and news site for the EPUB ecosystem is http://epubzone.org.

EPUB 2 was initially standardized in 2007 as a successor format to the Open eBook Publication Structure or "OEB", which was originally developed in 1999. A maintenance release, EPUB 2.0.1, approved in 2010, was the final release in the EPUB 2 branch.

In October, 2011, EPUB 3 superseded EPUB 2 when EPUB 3.0 was approved as a final Recommended Specification. A maintenance release, EPUB 3.0.1, was approved as a Final Recommended specification in June, 2014.

In January 2017, EPUB 3.1, the first major update to EPUB 3, was approved as a Recommended Specification. It is the current version of the standard.

The IDPF conducts its standards and trade activities through the operation of Working Groups and Special Interest Groups. All Working Groups and Special Interest Groups meet face to face throughout the year, via regular teleconference calls and via email lists that the IDPF provides. Access to meeting, teleconference and email lists are all benefits of membership. For the latest on IDPF EPUB specifications development, please visit the EPUB 3 Development Forum (hosted on Google Code). All work products are publicly available, registration and posting is open to members and Invited Experts.

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