本注册公开文件（RDD）描述了用于传输的比特流语法和语义 SMPTE 291从编码器输入，通过 MPEG-2传输流，并在解码器的输出端准确地重建辅助数据。这 该协议目前在多个现场产品中使用。此外，该数据格式已被一家公司使用 自2003年年中以来，主要的高清电视网络贡献和分发应用。

This Registered Disclosure Document (RDD) describes a bitstream syntax and semantics used to transmit SMPTE 291 formatted ancillary data (both VANC and HVANC) from the input of an encoder, through an MPEG-2 Transport Stream, and to reconstruct the ancillary data accurately at the output of a decoder. This protocol is in current use within several fielded productsi,ii. In addition, this data format has been in use by a major television network for HD contribution and distribution applications since mid 2003.