The present invention relates to a technique for authenticating data stored on media in order to prevent piracy. The crystal oscillator belongs to a specified type in which a dependence of an output frequency on temperature has one or more temperature dependence coefficients. Multicast addresses are then transmitted to the destination label switch routers. In another aspect, the device can present subset of the cached media content sections to users belonging to social circle networks and social circles. The materials contain microphase-separated aliphatic and aromatic domains. These heat sinks comprise a spreader plate having a recessed area on one surface and a flat area on another surface, at least two fins and porous reticulated foam blocks having intervening gaps that fill the width and at least a portion of the length between the fins.