Anyway, the analogy doesn't work because the concern, and rightful concern IMO which is why Apple clarified the legal language, was centered around content creation. The original wording, assuming it held up in court, would've given Apple legal power over the content itself generated in iBooks Author regardless of where the final product ended up. So, for example, say you started writing a book in iBooks Author, then decided to switch to another application. Apple could still bar you from distributing via any other outlet because the content was originally produced in iBooks Author. There is a massive difference between "any commercial content generated in our App must be distributed via our store" and "If you chose to distribute in .ibooks format you have to do it via our store."