The patentee here insists that the purpose of notices fixing resale prices, specifically "keeping up prices and preventing competition"—is more essential to the protection of patented goods than of copyrighted books. The Court expressed doubt that this was so, but in any case it was more likely that "Congress had no intention to use the term 'vend' in one sense in the patent act and . . . in another in the copyright law." Congress intended to provide "[p}rotection in the exclusive right to sell . . . in both instances, and the terms used in the statutes are to all intents the same."