The present invention is a computer system for delivering digital information over a network. A request receiving process receives a request for transmitting digital information after a start time and before an end time. The digital information has a number of packets. A transmit time process determines the time required to transmit the digital information based on the number of packets and a network speed. A scheduler schedules a transmit time for the digital information and an acceptance process accepts the digital information for transmission only if the time required to transmit is less than or equal to the difference between the transmit time and the end time.