The plaintiff goes on to promise that he will account monthly for all moneys received by him, and that he will take out all such patents and copyrights and trademarks as may in his judgment be necessary to protect the rights and articles affected by the agreement.It is true, of course, as the Appellate Division has said, that if he was under no duty to try to market designs or to place certificates of indorsement, his promise to account for profits or take out copyrights would be valueless.