bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.
acquired package info from repodata DB: repodata/1b484c8eb5b8229fba6b5a5b11fe895b7104760061a10c49a7af41194c2b52a2-primary.sqlite.bz2