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/e802af2051d51f58c8fb57056c7b77a907c36b8f997e1a71f828dbf9d916677d-primary.sqlite.bz2