Lempel–Ziv–Markov chain algorithm - Wikipedia, the free encyclopedia: "The Lempel–Ziv–Markov chain algorithm (LZMA) is an algorithm used to perform lossless data compression. It has been under development since 1998[1][2] and was first used in the 7z format of the 7-Zip archiver. This algorithm uses a dictionary compression scheme somewhat similar to LZ77 and features a high compression ratio (generally higher than bzip2[3][4]) and a variable compression-dictionary size (up to 4 GB)[5], while still maintaining decompression speed similar to other commonly used compression algorithms."
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