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/e30d7685744a7c83e00e34883b4caa13098c6dd4580c70b9313f50e8b8c0aee4-primary.sqlite.bz2