[Zaral Pixie]

Build DVD Master: Use this option to output to digital linear tape (DLT) used for mass replication of DVDs. Creating a DVD master requires having a DLT drive connected to your computer. DLT is the preferred method for sending DVD-Video disc images to a DVD replication facility. While some replication facilities accept different formats, virtually all replication services accept a DLT Type III tape in DDP 2.0 format. Alternative formats include DLT Type IIIXT and DLT Type IV tapes. Many replication services will also accept disc images on a recorded DVD format such as DVD-R, DVD+R, DVD-RW, DVD+RW, or DVD-RAM. Dual-layer DVD projects or projects that make use of any of the copy protection or region coding features of the DVD-Video specification must be output to DLT for replication.

maybe this will help