The mod_gzip Apache Module uses the well established and publicly available IETF (Internet Engineering Task Force) Content-Encoding standards in conjunction with publicy available GZIP compression libraries such as ZLIB (Copyright 1995-1998 Jean-loup Gailly and Mark Adler) to deliver dynamically compressed content "on the fly" to any browser or user-agent that is capable of receiving it.
% vinstall mod_gzip
For more information on mod_gzip, see the following.