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/7dd4e211aed20263007a33a4450f17d900d02ba14f0023a37d919ff0389a13cb-primary.sqlite.bz2