RFC 1979 (rfc1979) - Page 2 of 10

PPP Deflate Protocol

RFC 1979                      PPP Deflate                    August 1996


1.  Introduction

The 'deflate' compression format[3], as used by the PKZIP and gzip
compressors and as embodied in the freely and widely distributed
zlib[4] library source code, has the following features:

       - an apparently unencumbered encoding and compression
         algorithm, with an open and publically-available
         specification.

       - low-overhead escape mechanism for incompressible data.  The
         PPP Deflate specification offers options to reduce that
         overhead further.

       - heavily used for many years in networks, on modem and other
         point-to-point links to transfer files for personal computers
         and workstations.

       - easily achieves 2:1 compression on the Calgary corpus[5]
         using less than 64KBytes of memory on both sender and
         receive.

1.1.  Licensing

   The zlib source is widely and freely available, subject to the
   following copyright:

      (C) 1995 Jean-Loup Gailly and Mark Adler

       This software is provided 'as-is', without any express or implied
       warranty.  In no event will the authors be held liable for any
       damages arising from the use of this software.

       Permission is granted to anyone to use this software for any
       purpose, including commercial applications, and to alter it and
       redistribute it freely, subject to the following restrictions:

       1. The origin of this software must not be misrepresented; you
          must not claim that you wrote the original software. If you
          use this software in a product, an acknowledgment in the
          product documentation would be appreciated but is not
          required.

       2. Altered source versions must be plainly marked as such, and
          must not be misrepresented as being the original software.






Woods                        Informational