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/461dddd2bdbd52b6ca2b45c3bd3a9424709c4609f503d26109e16b400c6f9108-primary.sqlite.bz2