Actually, it was expected, since Apple is a hardware manufacturer: Apple’s software is used to in order to sell hardware. This is especially true for an application such as iBooks Author, which is distributed free of charge. For the terms, conditions are even relatively generous, because who wants to distribute books free of charge, can do this and the title should of course be sold in other eBookstore, just not in the iBooks format. However, Apple will not provide software to create for the competition. Currently, however, does not support the other iBooks Reader format.
iBooks are basically in the ePub format, but use ePub 3 with some extensions. ePub 3 is currently supported by only a few eBook readers, even those who decided to publish a book dummy text and uses the Apple templates without interactive widgets to be reckoned with smears in the presentation. The free iBooks are not protected by DRM or encrypted, it would quickly give viewers, as well as in ePub 3 builds on Apple’s variant (X) HTML. Anyone who wishes to remain compatible with other viewers should also export a PDF.
For those that need authoring software, which are designed to work with various platforms, must wait to see what will respond Adobe or other software manufacturers to Apple. The only relevant alternative for textbook publishers who want to create interactive books is Amazon with the KF8 format (Kindle Fire 8). KF8 also uses in HTML5, but is not identical with ePub 3.
Apple’s YouTube-Video: “The textbook. Reinvented for iPad.”