A DDP master is created using software, the audio data - your songs and the CD text. For this purpose, all audio files are dragged into the DDP project, the pause times are set, the order is fixed and the CD-Text and all necessary information are stored. The CD image is then created. This usually contains a .DAT file and a checksum, as well as the individual tracks on the CD. This DDP master is then usually zipped and sent to the press shop.