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1. 发明授权

US5319705A Method and system for multimedia access control enablement 失效
标题翻译：多媒体访问控制功能的方法和系统
公开(公告)号：US5319705A
公开(公告)日：1994-06-07
申请号：US964324
申请日：1992-10-21
申请人： Bernard J. Halter , Alphonse M. Bracco , Donald B. Johnson , An V. Le , Stephen M. Matyas , Rostislaw Prymak, deceased , James D. Randall , John D. Wilkins
发明人： Bernard J. Halter , Alphonse M. Bracco , Donald B. Johnson , An V. Le , Stephen M. Matyas , Rostislaw Prymak, deceased , James D. Randall , John D. Wilkins
IPC分类号： G06F9/445 , G06F1/00 , G06F12/14 , G06F13/00 , G06F21/00 , G06F21/20 , G06F21/22 , G06F21/24 , G09C1/00 , H04L9/08 , H04L9/00
CPC分类号： H04L9/0894 , G06F21/10 , H04L9/0637 , H04L9/0822 , H04L2209/56 , H04L2209/605
摘要： A method and system are disclosed for securely distributing a plurality of software files from a software distribution processor to a user processor, while selectively enabling the user processor to only use a subset of a lesser plurality of the software files. This is achieved by employing a customer key which includes a clear customer number and a derived portion derived from the customer number. The customer key is transformed into a second customer key which serves as a key expression for encrypting a file encryption key specifically intended for a respective one of the plurality of files. A plurality of software files can be stored together, for example on a CD-ROM, with each file encrypted under a corresponding file encryption key. The CD-ROM can be distributed to many user processors. When a specific user processor needs to run one of the software files, a request will be transmitted from the user processor to the software distribution processor. In response to that request, an encrypted file encryption key specific for the requested file, will be transmitted to the user processor. This will enable the user processor to decrypt only the requested file from the CD-ROM. All other files on the CD-ROM remain in their encrypted form and cannot be decrypted and used by the file encryption key received from the software distribution processor.
摘要翻译：公开了一种用于将多个软件文件从软件分发处理器安全地分发到用户处理器的方法和系统，同时选择性地使得用户处理器仅使用较少多个软件文件的子集。这是通过采用客户密钥来实现的，客户密钥包括清除客户号码和从客户号码导出的派生部分。客户密钥被转换成第二客户密钥，其作为用于加密专门针对多个文件中的相应文件的文件加密密钥的关键表达。可以将多个软件文件一起存储在例如CD-ROM上，每个文件在相应的文件加密密钥下被加密。 CD-ROM可以分发给许多用户处理器。当特定用户处理器需要运行其中一个软件文件时，将从用户处理器向软件分发处理器发送请求。响应于该请求，特定于所请求文件的加密文件加密密钥将被发送到用户处理器。这将使用户处理器只能从CD-ROM解密所请求的文件。 CD-ROM上的所有其他文件保持加密形式，不能被从软件分发处理器接收的文件加密密钥解密和使用。

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