A protocol, similar to DDP, that describes data that will be recorded onto an optical disc. Developed by Pioneer, CMF can now be recorded directly to DVD-R for Authoring (4.7 GB) media using the Pioneer DVR-S201 recorder. This allows a single DVD-R disc to serve as both a check disc for testing playback, and as the replication master for saving time and ensuring accuracy of the data. DVD-R Cutting Master Format is written to the lead-in area, which has been specially reserved for mastering applications and is defined in version 2.0 of the DVD-R for Authoring specification. Special software and some handling at a press facility are required to use the DVD-R Cutting Master.