ISO/TS 21219-24:2017定义了TPEG业务数据帧的LTE加密机制。它是专门为企业对企业（B2B）商业模式设计的。 本文件的目的是为TPEG提供一种简单易用但有效的条件接收机制，包括用于广播和/或点对点交付的加密。 对于服务提供商和设备制造商来说，标准化的条件接收机制有助于避免专利方法的扩散，从而增加实施工作量和交付周期。

ISO/TS 21219-24:2017 defines the LTE encryption mechanism for TPEG Service Data Frames. It has been specifically designed for use with Business to Business (B2B) business models. The objective of this document is to provide a simple to use, yet effective Conditional Access mechanism for TPEG including encryption for use with both broadcast and/or point-to-point delivery. For both service providers and device manufacturers, a standardized conditional access mechanism is beneficial to avoid a proliferation of proprietary methods with multiplied implementation effort and lead times.