Abstract: A method for detecting against unauthorized transmission of digital works comprises the steps of maintaining a registry of information permitting identification of digital copyrighted works, monitoring a network for transmission of at least one packet-based digital signal, extracting at least one feature from the at least one digital signal, comparing the extracted at least one feature with registry information and applying business rules based on the comparison result.

Abstract: A system and method for ensuring accurate reception of digitally encoded files that are transmitted in non-real time from a distribution station to a plurality of receiving stations, e.g. cable headends. Each file is divided into a plurality of data packets, with the packets being transmitted via satellite to the headends. Each headend determines which packets are in error (i.e. missing or jumbled) and need to be re-transmitted to the headend from the distribution station. After such a determination, each headend communicates a request over a land-link, e.g. telephone line or internet, to the distribution station requesting re-transmission of the packets in error. The distribution station then re-transmits these particular packets either via the land-link or the satellite. Re-transmission in non-real time via the land-link allows the headend to simultaneously receive packets via satellite and land-link so as to reduce the time taken to transmit files from the distribution station to the headends.

Abstract: A cable television (CATV) system including a plurality of headends, each headend outputting different video/audio programs to subscribers by way of a plurality of channels. The playlist or scheduling data corresponding to each channel is generated and modified by a separate and distinct scheduling computer, the scheduling computers for each channel being located at different locations. Such a system allows the output of each CATV channel at different headends to be generated, modified, and controlled via separate schedulers. This is advantageous in environments where different companies control the distribution of different channels.

Abstract: A system is provided for inserting selected commercials from a remote source via satellite into pre-cued cable network commercial breaks at targeted regional groupings of local cable headend operators without storage of the commercials at each headend. By sequencing the avails used for insertion among the groupings of headends, by creating plural levels of simultaneity, and by using compression/decompression techniques, a highly efficient use of the satellite per each transponder channel is achieved despite overlap in breaks as between networks; while, at the same time, allowing sufficient time during each break for the local headend operator to insert his own local ads if desired, and to use as well, if desired, the decompression capabilities of the system without the need for the headend to invest in its own.