Librarians purchasing E-books for their patrons used to feel comfortable thinking that, once purchased, the electronic content could be used over and over again, reducing the library's cost of books and catering to the surging demand of readers who love their e-books. But new agreements for libraries issuesd by Harper-Collins have thrown a monkey-wrench into that concept, limiting the use of e-books to 26 times, after which the publisher requires a new fee. With stagnant library budgets and publishers looking to protect their e-reader revenue, a clash among public and private titans of the literary scene has begun, and no one knows yet how it will end. "People just felt gobsmacked," the New York Times reported Ann Lee Silvers, head of the Materials Management Division of the Free Library of Philadelphia as saying.