Abstract: The present invention provides methods and apparatus for filtering a broadcast data stream that can support data flow, e.g. IPv6 packets. The present invention utilizes common filtering for packet segments that are common among IPv6 packets. Segments that are not common are separately filtered. A set of rules is applied to the filtered segments in order to determine whether corresponding packets should be subsequently processed. The present invention is applicable to numerous application including MPEG multicast services.

Abstract: Systems and methods applicable, for instance, in wireless communications. For example, a mobile node and/or other computer receiving a time slice burst of an elementary stream may act to obtain a delta-t time value specifying time to elapse until a subsequent burst, and/or may act to obtain information corresponding to burst length. As another example, the mobile node and/or other computer may set in view of the delta-t time value an alarm elapsed time value for activating reception circuitry. As yet another example, the mobile node and/or other computer may set in view of the information corresponding to burst length an alarm elapsed time value for deactivating reception circuitry.

Abstract: A recording device for digital data streams, such as digital TV broadcasts or digitized music, stores copies of program content encrypted by a key unique to the recording device. Distribution of program content is thus discouraged, since intelligible playback of program content would not be obtained on another recording device, which would have a different key. To reduce manufacturing complexity which would result from requiring all bits of a key to inhere in hardware, a first portion of the key inheres in hardware and a second portion is selected from among several candidates residing in a memory device, the key being determined by combining the first and second portions according to predetermined rules. The second portion is reselected at predetermined intervals from among the candidates. Only payload portions of packets are encrypted while header portions are left in the clear in order to facilitate ancillary functions of recorder such as fast forward, fast rewind, and program search.

Abstract: The present invention provides methods and apparatus for filtering a broadcast data stream that can support data flow, e.g. IPv6 packets. The present invention utilizes common filtering for packet segments that are common among IPv6 packets. Segments that are not common are separately filtered. A set of rules is applied to the filtered segments in order to determine whether corresponding packets should be subsequently processed. The present invention is applicable to numerous application including MPEG multicast services.