Xy-pic User's Guide: Next: 4.2 Backwards compatibility. Up: 4 Availability and Further . Previous: 4 Availability and Further .

## Getting Xy-pic

The easiest way to retrieve the latest version of Xy-pic is through the Xy-pic home pages [7] on the World Wide Web. It can also be retrieved from Internet ftp host `ftp.diku.dk` in `/diku/users/kris/TeX` as well as from `ftp.mpce.mq.edu.au` in `/pub/maths/TeX` in files starting with `xy`. Finally, Xy-pic has been contributed to the CTAN archives where it is located in the directory `macros/generic/diagrams/xypic`.

#### License:

Xy-pic is free software in the sense that it is available under the following license conditions:

> The Xy-pic package is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

> The Xy-pic package is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.

> You should have received a copy of the GNU General Public License along with this package; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

In practice this means that you are free to use Xy-pic for your documents but if you distribute any part of Xy-pic (including modified versions) to someone then you are obliged to ensure that the full source text of Xy-pic is available to them (the full text of the license in the file `COPYING` explains this in somewhat more detail ).

Xy-pic User's Guide: Next: 4.2 Backwards compatibility. Up: 4 Availability and Further . Previous: 4 Availability and Further .