How obvious was it to you?
And how could they have checked if the company which brings the app into AppStore has or has not the rights to distribute these books?So, please, tell us, how did you come to conclusion, that this was some kind of violation?
Tell us, by which review process could Apple have concluded that it was a violation? Is this process a part of the current review? What makes you "believe" that Apple knew about it?
Just because you thought that is...