Bzip2 is a freely available, patent free (see below), high-quality data compressor. It typically compresses files to within 10/100 to 15/100 of the best available techniques, whilst being around twice as fast at compression and six times faster at decompression.
bzip2 compresses files using the Burrows-Wheeler block-sorting text compression algorithm, and Huffman coding. Compression is generally considerably better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors.
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