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Invention Grant
US08281128B2 Method and apparatus for encrypting transport stream of multimedia content, and method and apparatus for decrypting transport stream of multimedia content 失效
用于加密多媒体内容的传输流的方法和装置，以及用于解密多媒体内容的传输流的方法和装置

Method and apparatus for encrypting transport stream of multimedia content, and method and apparatus for decrypting transport stream of multimedia content
Abstract:
A method of transporting an encrypted stream of multimedia content is provided. In the method, when a packet contains data of a predetermined length including selected data from pieces of data corresponding to the multimedia content and a header, key information, and first time information from among pieces of information included in a selected packet from among at least one packet are received, and encryption information is determined from the key information and the first time information, according to a key derivation function. The first time information is variable with time. The at least one packet including data corresponding to the multimedia content is encrypted using the encryption information. The at least one encrypted packet and the key information are transported.
Abstract(Chinese):

提供了一种传输多媒体内容的加密流的方法。 在该方法中，当分组包含从包括多媒体内容的数据的选定数据的预定长度的数据以及包括在所选择的分组中的至少一个信息中的报头，密钥信息和第一时间信息 接收一个分组，根据密钥导出函数从密钥信息和第一时间信息确定加密信息。 第一次信息随时间变化。 使用加密信息来加密包括对应于多媒体内容的数据的至少一个分组。 传送至少一个加密分组和密钥信息。

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