基本信息:
- 专利标题： 向MPEG接收/译码器下载数据的方法和用来实现该方法的MPEG传输系统
- 专利标题（英）：Method of downloading of data to MPEG receiver/decoder and MPEG transmission system for implementing the same
- 申请号：CN97182181.X 申请日：1997-04-25
- 公开(公告)号：CN1254475A 公开(公告)日：2000-05-24
- 发明人： J-C·萨尔法蒂 , J·梅里克
- 申请人： 卡纳尔股份有限公司
- 申请人地址： 法国巴黎
- 专利权人： 卡纳尔股份有限公司
- 当前专利权人： 汤姆森许可公司
- 当前专利权人地址： 法国巴黎
- 代理机构： 中国专利代理(香港)有限公司
- 代理人： 王岳; 王忠忠
- 优先权： 97400650.4 1997.03.21 EP
- 国际申请： PCT/EP1997/02111 1997.04.25
- 国际公布： WO1998/43431 EN 1998.10.01
- 进入国家日期： 1999-11-11
- 主分类号： H04N7/167
- IPC分类号： H04N7/167
In a digital satellite television system in which a television receives its signal via a receiver/decoder, such as a set top box, interactive applications can be downloaded and run on the receiver/decoder. The application code is arranged as modules, and the downloading of modules is preceded by searching a directory module within a specified local address. The modules are signed and the directory module is signed and encrypted so that a single encryption applies to all of the modules making up the application. Multiple public encryption keys are stored in ROM in the receiver/decoder, so that applications can be created by different sources, without the sources needing to know each other's private encryption keys. A facility is provided to enable an encryption key to be temporarily stored in RAM in the receiver/decoder, so that a manufacturer of the receiver/decoder can check its functionality. A signature of the directory may be hidden at a variable position in a block of dummy data in the directory module. An application to be downloaded may be checked against an application validation bitmap stored in the receiver/decoder.
公开/授权文献:
- CN1178504C 向MPEG接收/译码器下载数据的方法和MPEG传输系统 公开/授权日：2004-12-01