A method and apparatus is provided for receiving and/or reproducing a digital signal, capable of efficiently recording a compressed, packeted digital signal and inhibiting a copy thereof. An input packet signal is added with a time stamp indicating a relative time of an arrival of the packet, and the...http://www.google.com.hk/patents/US6321025?utm_source=gb-gplus-share專利 US6321025 - Method and apparatus for receiving and/or reproducing digital signal
