[thirdparty/cups.git] / LICENSE.txt

                Common UNIX Printing System License Agreement

                Copyright 1997-2002 by Easy Software Products
                        44141 AIRPORT VIEW DR STE 204
                     HOLLYWOOD, MARYLAND 20636-3111 USA

                           Voice: +1.301.373.9600
                          Email: cups-info@cups.org
                          WWW: http://www.cups.org


INTRODUCTION

The Common UNIX Printing System^TM, ("CUPS^TM"), is provided under
the GNU General Public License ("GPL") and GNU Library General Public
License ("LGPL"), Version 2, with exceptions for Apple operating
systems. A copy of the exceptions and licenses follow this
introduction.

The GNU LGPL applies to the CUPS API library, located in the "cups"
subdirectory of the CUPS source distribution and in the
"/usr/include/cups" directory and "libcups.a", "libcups_s.a",
"libcups.sl", "libcups.so", or "libcups.dylib" files in the binary
distributions.

The GNU GPL applies to the remainder of the CUPS distribution,
including the "pstoraster" filter which is based upon GNU Ghostscript
5.50 and the "pdftops" filter which is based upon Xpdf 0.93a.

For those not familiar with the GNU GPL, the license basically allows
you to:

   - Use the CUPS software at no charge.
   - Distribute verbatim copies of the software in source or binary
     form.
   - Sell verbatim copies of the software for a media fee, or sell
     support for the software.
   - Distribute or sell printer drivers and filters that use CUPS so
     long as source code is made available under the GPL.

What this license *does not* allow you to do is make changes or add
features to CUPS and then sell a binary distribution without source
code. You must provide source for any new drivers, changes, or
additions to the software, and all code must be provided under the GPL
or LGPL as appropriate. The only exceptions to this are the portions of
the CUPS software covered by the Apple operating system license
exceptions outlined later in this license agreement.

The GNU LGPL relaxes the "link-to" restriction, allowing you to develop
applications that use the CUPS API library under other licenses and/or
conditions as appropriate for your application.


APPLE OPERATING SYSTEM DEVELOPMENT LICENSE EXCEPTION

In addition, as the copyright holder of CUPS, Easy Software Products
grants the following special exception:

    Software that is developed by any person or entity for an Apple
    Operating System ("Apple OS-Developed Software"), including but not
    limited to Apple and third party printer drivers, filters, and
    backends for an Apple Operating System, that is linked to the CUPS
    imaging library or based on any sample filters or backends provided
    with CUPS shall not be considered to be a derivative work or
    collective work based on the CUPS program and is exempt from the
    mandatory source code release clauses of the GNU GPL. You may
    therefore distribute linked combinations of the CUPS imaging
    library with Apple OS-Developed Software without releasing the
    source code of the Apple OS-Developed Software. You may also use
    sample filters and backends provided with CUPS to develop Apple
    OS-Developed Software without releasing the source code of the
    Apple OS-Developed Software.

An Apple Operating System means any operating system software developed
and/or marketed by Apple Computer, Inc., including but not limited to
all existing releases and versions of Apple's Darwin, Mac OS X, and Mac
OS X Server products and all follow-on releases and future versions
thereof.

This exception is only available for Apple OS-Developed Software and
does not apply to software that is distributed for use on other
operating systems.

All CUPS software that falls under this license exception have the
following text at the top of each source file:

    This file is subject to the Apple OS-Developed Software exception.


OPENSSL TOOLKIT LICENSE EXCEPTION

In addition, as the copyright holder of CUPS, Easy Software Products
grants the following special exception:

    Easy Software Products explicitly allows the compilation and
    distribution of the CUPS software with the OpenSSL Toolkit. The
    requirement for disclosure of the use of OpenSSL in CUPS-derived
    software is not deemed by Easy Software Products to constitute a
    violation of the distribution terms of the GNU GPL, since the GNU GPL
    specifically requires acknowledgement of the original copyright holder
    in derived works.


TRADEMARKS

Easy Software Products has trademarked the Common UNIX Printing System,
CUPS, and CUPS logo. These names and logos may be used freely in any direct
port or binary distribution of CUPS. To use them in derivative products,
please contract Easy Software Products for written permission. Our intention
is to protect the value of these trademarks and ensure that any derivative
product meets the same high-quality standards as the original.


BINARY DISTRIBUTION RIGHTS

Easy Software Products also sells rights to the CUPS source code under a
binary distribution license for vendors that are unable to release source
code for their drivers, additions, and modifications to CUPS under the GNU
GPL and LGPL. For information please contact us at the address shown above.

The Common UNIX Printing System provides a  "pdftops" filter is based on
the Xpdf 0.93a software. For binary distribution licensing of this
software, please contact:

     Derek B. Noonburg
     Email: derekn@foolabs.com
     WWW: http://www.foolabs.com/xpdf/


SUPPORT

Easy Software Products sells software support for CUPS as well as a
commercial printing product based on CUPS called ESP Print Pro. You can find
out more at our web site:

     http://www.easysw.com
\f
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

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\f
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\f
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\f
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\f
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\f
                  GNU LIBRARY GENERAL PUBLIC LICENSE
                         Version 2, June 1991

          Copyright (C) 1991 Free Software Foundation, Inc.
       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

     Everyone is permitted to copy and distribute verbatim copies
      of this license document, but changing it is not allowed.

    [This is the first released version of the library GPL.  It is
   numbered 2 because it goes with version 2 of the ordinary GPL.]

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  To protect your rights, we need to make restrictions that forbid
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\f
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\f
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