Abstract: A multicast system is contemplated. The multicast system may be configured to facilitate changing between multicast steams by caching one multicast stream while tuned to another multicast stream in anticipation of tuning to the cached multicast stream. Attributes associated with available multicast streams may be communicated to assist accessing devices in deciding which one or more of the available multicast streams to cache.

Abstract: A multicast system is contemplated. The multicast system may be configured to facilitate changing between multicast steams by caching one multicast stream while tuned to another multicast stream in anticipation of tuning to the cached multicast stream. Attributes associated with available multicast streams may be communicated to assist accessing devices in deciding which one or more of the available multicast streams to cache.

Abstract: License management systems and methods allow licenses for a computer program to be available for use at each of a plurality of nodes of a network. If a valid license file at a local node contains an unexpired, available license, a license manager at the local node permits the computer program to be executed at the requesting local node. If no such license is available in a valid license file at such local node, the license manager searches the other nodes for a valid license file containing an unexpired, available license. In one embodiment, if an unexpired available license is located in a valid license file at a second (or "remote") node, the license manager transfers such license to the local node, and assigns and encrypts a unique identification to such transferred license. The original record of the transferred license is modified by erasing it from the license file at the remote node so that the transferred license is no longer available there.

Abstract: The provision of power by the human body to bicycles, tricycles, exercise equipment, wheeled chairs or the like is effected using a hand-operated lever (35) and/or a pair of pendulums (23). The hand-operated lever is pivoted about an axle (33) on a frame (12) of the cycle or other equipment. Rotation of the lever about that axle in either direction causes a respective sprocket wheel (38) to rotate about an associated axis, with consequential rotation of a rotatable member (14) which drives the cycle or other equipment. A tensioning or recoil mechanism (40,42) returns the sprocket wheel or drum to its original position when the lever is rotated in the opposite direction about the axle. Similarly, forward movement of a pendulum about the axle (22) from which it depends causes an associated different sprocket wheel (28) or drum to rotate about the axis to cause the rotatable member to move and drive the cycle or other equipment.