公开(公告)号：US6016348A

公开(公告)日：2000-01-18

申请号：US762488

申请日：1996-11-27

Applicant: Harold Blatter ,  Thomas Edward Horlander ,  Kevin Elliott Bridgewater ,  Michael Scott Deiss

Inventor： Harold Blatter ,  Thomas Edward Horlander ,  Kevin Elliott Bridgewater ,  Michael Scott Deiss

IPC: G09C1/00 ,  H04L9/10 ,  H04N5/44 ,  H04N7/167 ,  H04N21/418 ,  H04N21/4405 ,  H04N21/4623

CPC classification number: H04N21/4181 ,  H04N21/4147 ,  H04N21/4345 ,  H04N21/4405 ,  H04N21/4623 ,  H04N5/4401 ,  H04N7/1675 ,  H04N21/42646

Abstract: A decoder conditional access system incorporates different encryption systems for providing access to programs derived from different sources. A conditional access processor for processing encrypted program data and an associated encryption code includes a first algorithm means for decrypting the encryption code to provide an encryption key. The conditional access processor also includes a second algorithm means for encrypting the encryption key and the second encryption algorithm is different to the first encryption algorithm. A datastream representing the program is generated from encrypted program data and an associated encryption code. The encryption code is decrypted to provide an encryption key using a first algorithm. The encryption key is encrypted using a second algorithm different to the first encryption algorithm and the program datastream is formed from the encrypted program data and the encrypted encryption key. The program datastream is decrypted by selecting between a first and a second decryption algorithm and by decrypting the encryption code to provide an encryption key. The encryption key is used to decrypt the encrypted program. A storage medium data format for recording encrypted program data is also disclosed.

Abstract translation: 解码器条件访问系统包含不同的加密系统，用于提供对源自不同来源的程序的访问。 用于处理加密程序数据和相关联的加密代码的条件访问处理器包括用于解密加密代码以提供加密密钥的第一算法装置。 条件访问处理器还包括用于加密加密密钥的第二算法装置，第二加密算法与第一加密算法不同。 表示程序的数据流是从加密程序数据和相关联的加密代码生成的。 加密代码被解密以使用第一算法提供加密密钥。 使用与第一加密算法不同的第二算法来加密加密密钥，并且从加密的程序数据和加密的加密密钥形成程序数据流。 通过在第一和第二解密算法之间进行选择并解密加密码以提供加密密钥来对程序数据流进行解密。 加密密钥用于解密加密程序。 还公开了用于记录加密程序数据的存储介质数据格式。