DVD master formats accepted:

• Replicated DVD (Cannot be copy protected)
• DVD-R (Authoring grade is preferred, but consumer grade usually works fine).
• DVD 9’s preferred as ISO image of layer 0 on one disc, and an ISO image of layer 1 on another disc. Dual layered DVDR will work in most instances.
  In some instances files can be sent via ftp as DDP or ISO image. Call for more info.
  
  Note: The most common problem with masters is using a consumer grade programs to create the master for replication. Usually these discs will play fine, but they can have “hidden” problems when used for replication (RW – sub channel, etc.). These are usually caused by incompatibility issues between the programs used and the drives. In many instances, these masters will still work for replication, however the best advice is to use a reputable DVD authoring house when creating masters.