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/43adc5a1610aa1b3d614ea3f73ed977d0b3b56993f6143db5d5afd459fa9147f-primary.sqlite.bz2