Disc Description Protocol or DDP as it's commonly referred to, is the industry standard and preferred format for CD replication. It's typically prepared by a professional mastering engineer using specialized software. The “file set” typically consists of 4-5 files that contain the audio, track ID information, and optionally CD-Text information. The DDP format is well suited for electronic delivery as it can be easily uploaded through our website and delivered directly to the plant. There is no loss of quality when using this format which makes it ideal.