Regulators with the European Union are prepared to accept a proposal by Apple and four publishers to end an antitrust investigation into ebook pricing, Reuters sources say. Under the terms of the arrangement, Apple and the publishers would let retailers set their own prices and discounts for at least two years. The deal would also suspend "most-favored nation" contracts for at least five years; in this case, for instance, it would block contracts stopping retailers from selling books more cheaply than Apple.