What is the difference between DTS-HD Master Audio Essential and DTS-HD Master Audio?

DTS-HD Master Audio Essential is a full Master Audio feature set for Blu-ray Disc, with the exception of the DTS ES Matrix and NEO 6 codec.

The Essential encode contains the lossless 5.1 stream, but leaves out the more esoteric ES Matrix and NEO-6 streams, both of which can be created in the surround receiver from a lossy DTS stream.