LZMA & LZMA2-Komprimierung
Hochverhältnis-Komprimierungsalgorithmen von Igor Pavlov
LZMA (Lempel-Ziv-Markov chain algorithm) is the default compression method for the 7z format. It typically achieves 30-50% better compression than the older deflate algorithm used in ZIP files.
LZMA2 is an improved version that offers better multithreading support and slightly improved compression ratios. It is the default for .xz files as well.
Both algorithms are open source and have been adopted by many other projects including xz-utils, GNU tar, and various Linux distributions for package compression.