.. only:: html


.. _qgis.documentation.preamble:

********
Preamble
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This document is the original user guide of the described software
QGIS. The software and hardware described in this document are in most
cases registered trademarks and are therefore subject to legal
requirements. QGIS is subject to the GNU General Public License. Find
more information on the QGIS homepage, https://www.qgis.org.

The details, data, and results in this document have been written and
verified to the best of the knowledge and responsibility of the
authors and editors.  Nevertheless, mistakes concerning the content
are possible.

Therefore, data are not liable to any duties or guarantees. The
authors, editors and publishers do not take any responsibility or
liability for failures and their consequences. You are always welcome
to report possible mistakes.

This document has been typeset with reStructuredText. It is available
as reST source code via `github
<https://github.com/qgis/QGIS-Documentation>`_ and online as HTML and
PDF via https://www.qgis.org/en/docs/. Translated versions of this
document can be downloaded in several formats via the documentation
area of the QGIS project as well. For more information about
contributing to this document and about translating it, please visit
https://qgis.org/en/site/getinvolved/index.html.

**Links in this Document**

This document contains internal and external links. Clicking on an
internal link moves within the document, while clicking on an external
link opens an internet address. In PDF form, internal and external
links are shown in blue and are handled by the system browser. In HTML
form, the browser displays and handles both identically.

**User, Installation and Coding Guide Authors and Editors:**

The list of the persons who contribute on writing, reviewing and translating
the following documentation is available at :ref:`doc_contributors`.

Copyright (c) 2004 - 2017 QGIS Development Team

**Internet:** https://www.qgis.org

**License of this document**

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. A
copy of the license is included in Appendix :ref:`gfl_appendix`.