At this point, music manager Albert Grossman began to take an interest in Dylan's business affairs. Grossman persuaded Dylan to transfer the publishing rights of his songs from Duchess Music, whom he had signed a contract with in January 1962, to Witmark Music, a division of Warner's music publishing operation. Dylan signed a contract with Witmark on July 13, 1962. Unknown to Dylan, Grossman had also negotiated a deal with Witmark. This gave Grossman fifty percent of Witmark's share of the publishing income generated by any songwriter Grossman had brought to the company. This "secret deal" resulted in a bitter legal battle between Dylan and Grossman in the 1980s.