DVB Simulcrypt的本文件阐述了前端两个或多个条件接收系统之间的互操作性要求。它规定了系统架构、时序关系、消息传递结构、扩展互操作性和控制。系统架构中的组件代表功能单元。物理单元之间的边界不需要与功能单元之间的边界匹配。SCS可能位于MUX中，或者SCS和MUX可以独立构建。 这两种架构都不是强制性的。

The present document of DVB-Simulcrypt addresses the requirements for interoperability between two or more conditional access systems at a head-end. It specifies the system architecture, timing relationships, messaging structures, extended interoperability and control.The components within the system architecture represent functional units. The boundaries between physical units are not required to match the boundaries between functional units. It is possible that the SCS could be in the MUX or the SCS and MUX could be built independently. Neither architecture is mandated.