Abstract: The invention relates to the transmission of digital data which can be processed to generate video, audio and/or auxiliary data for television programmes and related information. As part of the data transmission a data stream of Out of Band (OOB) data is typically transmitted. However this requires additional components to be provided in the broadcast data receivers (18). The present invention allows for the transcoding and reformatting of data at the broadcast location (2) which allows the transmission of data between the broadcast location (2) and the broadcast data receivers (18) without the need for an OOB tuner and/or modem to be provided at the broadcast data receiver.