The International Digital Publishing Forum (IDPF) is a trade and standards association for the digital publishing industry, set up to establish a standard for electronic book publishing. It was responsible for the standard EPUBcurrently being used by most e-readers.
Starting from the Open eBook Publication Structure or “OEB” (1999), created loosely around HTML , it then defined the Open Publication Structure (OPS), the Open Packaging Format (OPF) and the Open Container Format (OCF). These formats are the basis for EPUB.
While the basic standards are now established (pages, hyperlinks, definition of the table of contents, authors, etc.), some other standards intersect the hardware field, such as those for power and for hardware devices, and are still undergoing change and evolution. Other standards for ecommerce (including Digital Rights Management ), are actually controlled by vendors.
On January 30, 2017, IDPF was combined into the World Wide Web Consortium . 
- Jump up^ “IDPF Has Combined With W3C” . 2017-01-30 . Retrieved 2017-02-06 .