Apple's end user license agreement for the iBooks Author app has generated extensive controversy among authors and publishers. Namely, the agreement restricts paid distribution of "works" created with the software to the iBookstore only. Technical limitations may make the restriction a moot point for the time being, as only Apple's own iBooks apps can even read the files generated by iBooks Author. But forcing users to sell content through the iBookstore, governed by a separate contract with its own terms, might not survive an antitrust challenge in court if it were to come up.A point:
But the control issue is mooted by the fact that only iBooks 2 on the iPad can even read the files generated by iBooks Author. As it currently stands, iBooks Author can only generate an "iBook," not any sort of standards-based e-book. While the format largely relies on the ePub 2 standard for text and images, the interactivity and advanced layout capabilities are added via proprietary extensions that only iBooks can interpret,. And, for now, iBooks made with iBooks Author can only be "experienced" on an iPad—we confirmed that trying to open such iBooks files on an iPhone only generates an error message.That might be true for now, but I don't know many useful file-types that didn't make a jump to another machine somehow.