Meridian Lossless Packing
MLP - Meridial Lossless Packing - is a Lossless compression scheme developed by the british pro-audio developer and manufacturer Meridian specially for inclusion in the DVD-Audio format.
It's a completely closed format - there is no source code or format documentation available. Also, the encoder is quite expensive (US$ 2500.00 as of October/2005).
Compression efficiency is quite bad for CD content (16bit, 44100Hz, stereo), being outperformed by Shorten and even RAR. It is somewhat better for high resolution content (multichannel, 24bit, 96kHz), but still beaten by, E.G, WavPack -h in both speed and compression. Compression is very slow.