pptp-linux is an implementation of the PPTP protocol for Linux and
other Unix systems.

The code is released under the terms of the GPL; see the file COPYING
for details.

You can find notes on installing and using this package in the file
${PREFIX}/share/doc/pptp/USING; design notes are in the Documentation 
directory; and the standards documents used to implement pptp-linux 
can be found in the Reference directory.