The invention provides a digital copyright key management method and system. The method comprises the following steps: receiving data request information comprising a service number and a business number and sent by a video encryption module; judging whether the service number corresponds to on demand business or live broadcast business; and generating a corresponding business key according to the service number, and sending the business key to the video encryption module. By adopting the digital copyright key management method and system provided by the invention, streaming media video key management in a cloud environment can be realized, and the key management of the on demand business and the live broadcast business and the real-time key management based on user roles can be realized.