Windows Media Audio Lossless (WMA Lossless) is a lossless audio codec that competes with ATRAC Advanced Lossless, Dolby TrueHD, DTS-HD Master Audio, Shorten, Monkey's Audio, FLAC, Apple Lossless, and WavPack (Since late 2011,[36][37][38] the last three have the advantage of being open source software and available for nearly any operating system.) Designed for archival purposes,[39] it compresses audio signals without loss of quality from the original using VBR. When decompressed, the audio signal is an exact replica of the original.