Disc Description Protocol (DDP) is a format for specifying the content of optical discs, including CDs and DVDs.
DDP is commonly used for delivery of disc premasters for duplication. DDP is a proprietary format and is the property of DCA. The file format specification is not freely available.
The DDP must contain 4 parts:
Audio image(s) (.DAT file(s))
DDP Identifier (DDPID)
DDP Stream descriptor (DDPMS)
Subcode descriptor (PQDESCR)
An optional text file, containing the track titles and timings, can also be included.
↑"Disc Description Protocol". Retrieved March 4, 2019. DDP was invented by Doug Carson and DCA ... and continues to be licensed and kept current by DCA. ... DDP® is a registered trademark of Doug Carson & Associates, Inc. and is protected by U.S. Copyright. Disc Description Protocol and the DDP Logo are trademarks of DCA, Inc.
Convention: Any item in this table that has the form of "A+B" or "A+B+C" indicates a disk format that spans multiple files, where A contains the bulk of the data, and B and C are sidecar files.