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/c0e25e2e553dcd55ea9dbe2ce833d6a6a718c344ea9f4e23b8f3555958d6ecdc-primary.sqlite.bz2