Quote:
Originally Posted by mdriftmeyer 
ePubs is an open format and those purchased books can be used elsewhere.
Reading those books via iBooks isn't keeping you from reading those books from a 3rd party application that can be developed and support ePubs format.
You just won't get all the extra little touches like preview a book and then buy the book via iBooks without a third party having to develop those services that Apple developed for it's users, not for it's jailbroken users.
Get it?

ePubs is an open format and those purchased books can be used elsewhere.
Reading those books via iBooks isn't keeping you from reading those books from a 3rd party application that can be developed and support ePubs format.
You just won't get all the extra little touches like preview a book and then buy the book via iBooks without a third party having to develop those services that Apple developed for it's users, not for it's jailbroken users.
Get it?
ePubs is an open standard
However, iBooks uses a closed standard. These books are NOT transferrable, either into, nor out of iBooks.







