[thirdparty/cups.git] / doc / help / license.html

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	<TITLE>Software License Agreement</TITLE>
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<P ALIGN="CENTER">Copyright 1997-2007 by Easy Software Products<BR>
44141 AIRPORT VIEW DR STE 204<BR>
HOLLYWOOD, MARYLAND 20636 USA<BR>
<BR>
Voice: +1.301.373.9600<BR>
Email: <A HREF="mailto:cups-info@cups.org">cups-info@cups.org</A><BR>
WWW: <A HREF="http://www.cups.org">http://www.cups.org</A>

<H2 CLASS="title"><A NAME="INTRO">Introduction</A></H2>

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

<P>The GNU LGPL applies to the CUPS and CUPS Imaging libraries
located in the "cups" and "filter" subdirectories of the CUPS
source distribution and in the "cups" include directory and
library files in the binary distributions. The GNU GPL applies to
the remainder of the CUPS distribution, including the "pdftops"
filter which is based upon Xpdf.</P>

<P>For those not familiar with the GNU GPL, the license basically
allows you to:</P>

<UL>

	<LI>Use the CUPS software at no charge.</LI>

	<LI>Distribute verbatim copies of the software in source
	or binary form.</LI>

	<LI>Sell verbatim copies of the software for a media
	fee, or sell support for the software.</LI>

</UL>

<P>What this license <EM>does not</EM> 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
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.</P>

<P>The GNU LGPL relaxes the "link-to" restriction, allowing you
to develop applications that use the CUPS and CUPS Imaging
libraries under other licenses and/or conditions as appropriate
for your application, driver, or filter.</P>


<H2 CLASS="title"><A NAME="EXCEPTIONS">License Exceptions</A></H2>

<P>In addition, as the copyright holder of CUPS, Easy Software
Products grants the following special exceptions:</P>

<OL>

	<LI><B>Apple Operating System Development License
	Exception</B>;

	<OL TYPE="a">

		<LI>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.</LI>

		<LI>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.</LI>

		<LI>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.</LI>

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

		<BLOCKQUOTE>This file is subject to the Apple
		OS-Developed Software
		exception.</BLOCKQUOTE></LI>

	</OL>

	<LI><B>OpenSSL Toolkit License Exception</B>;

	<OL TYPE="a">

		<LI>Easy Software Products explicitly allows the
		compilation and distribution of the CUPS
		software with the OpenSSL Toolkit.</LI>

	</OL>

</OL>

<P>No developer is required to provide these exceptions in a
derived work.</P>


<H2 CLASS="title"><A NAME="KERBEROS">Kerberos Support Code</A></H2>

<P>The Kerberos support code ("KSC") is copyright 2006 by Jelmer
Vernooij and is provided 'as-is', without any express or implied
warranty. In no event will the author or Easy Software Products
be held liable for any damages arising from the use of the
KSC.</P>

<P>Sources files containing KSC have the following text at the top
of each source file:</P>

<BLOCKQUOTE>This file contains Kerberos support code, copyright
2006 by Jelmer Vernooij.</BLOCKQUOTE>

<P>The KSC copyright and license apply <EM>only</EM> to
Kerberos-related feature code in CUPS. Such code is typically
conditionally compiled based on the present of the
<TT>HAVE_GSSAPI</TT> preprocessor definition.</P>

<P>Permission is granted to anyone to use the KSC for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following
restrictions:</P>

<OL>

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

	<LI>Altered source versions must be plainly marked as
	such, and must not be misrepresented as being the
	original software.</LI>

	<LI>This notice may not be removed or altered from any
	source distribution.</LI>

</OL>


<H2 CLASS="title"><A NAME="TRADEMARKS">Trademarks</A></H2>

<P>Easy Software Products has trademarked the Common UNIX
Printing System, CUPS, and CUPS logo. You may use these names and
logos in any direct port or binary distribution of CUPS. Please
contact Easy Software Products for written permission to use them
in derivative products. 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.</P>


<H2 CLASS="title"><A NAME="BINARY">Binary Distribution Rights</A></H2>

<P>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 additions and
modifications to CUPS under the GNU GPL and LGPL. For information
please contact us at the address shown above.</P>

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

<BLOCKQUOTE>
Derek B. Noonburg<BR>
Email: <A HREF="mailto:derekn@glyphandcog.com">derekn@glyphandcog.com</A><BR>
WWW: <A HREF="http://www.glyphandcog.com/">http://www.glyphandcog.com/</A>
</BLOCKQUOTE>


<H2 CLASS="title"><A NAME="SUPPORT">Support</A></H2>

<P>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:</P>

<UL><PRE>
<A HREF="http://www.easysw.com/">http://www.easysw.com/</A>
</PRE></UL>


<H2 CLASS="title"><A NAME="GPL">GNU GENERAL PUBLIC LICENSE</A></H2>

<P>Version 2, June 1991

<PRE>
Copyright 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.
</PRE>

<H3>Preamble</H3>

<P>The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users.  This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it.  (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.)  You can apply it to
your programs, too.

<P>When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

<P>To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.

<P>For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have.  You must make sure that they, too, receive or can get the
source code.  And you must show them these terms so they know their
rights.

<P>We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.

<P>Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software.  If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.

<P>Finally, any free program is threatened constantly by software
patents.  We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

<P>The precise terms and conditions for copying, distribution and
modification follow.

<H3>GNU GENERAL PUBLIC LICENSE<BR>
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>

<OL START="0">

<LI>This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language.  (Hereinafter, translation is included without limitation in
the term "modification".)  Each licensee is addressed as "you".

<P>Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.

<LI>You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.

<P>You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.

<LI>You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:

<OL TYPE="a">

<LI>You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.

<LI>You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.

<LI>if the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License.  (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)

</OL>

<P>These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works.  But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.

<P>Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.

<P>In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.

<LI>You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

<OL TYPE="a">

<LI>Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,

<LI>Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,

<LI>Accompany it with the information you received as to the offer
to distribute corresponding source code.  (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)

</OL>

<P>The source code for a work means the preferred form of the work for
making modifications to it.  For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable.  However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.

<P>If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.

<LI>You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

<LI>You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

<LI>Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

<LI>If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

<P>If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

<P>It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

<P>This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.

<LI>If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

<LI>The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

<P>Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

<LI>If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

</OL>

<H3>NO WARRANTY</H3>

<OL START="11">

<LI>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

<LI>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

</OL>

<H3>END OF TERMS AND CONDITIONS</H3>

<H3>How to Apply These Terms to Your New Programs</H3>

<P>If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

<P>To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

<PRE>
<VAR>one line to give the program's name and an idea of what it does.</VAR>
Copyright (C) <VAR>yyyy</VAR>  <VAR>name of author</VAR>

This program 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.

This program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
</PRE>

<P>Also add information on how to contact you by electronic and paper mail.

<P>If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

<PRE>
Gnomovision version 69, Copyright (C) <VAR>year</VAR> <VAR>name of author</VAR>
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'.  This is free software, and you are welcome
to redistribute it under certain conditions; type `show c' 
for details.
</PRE>

<P>The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
the appropriate parts of the General Public License.  Of course, the
commands you use may be called something other than <SAMP>`show w'</SAMP> and
<SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
suits your program.

<P>You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

<PRE>
Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision'
(which makes passes at compilers) written 
by James Hacker.

<VAR>signature of Ty Coon</VAR>, 1 April 1989
Ty Coon, President of Vice
</PRE>

<H2 CLASS="title"><A NAME="LGPL">GNU LIBRARY GENERAL PUBLIC LICENSE</A></H2>

<P>Version 2, June 1991

<PRE>
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.]
</PRE>

<H3>Preamble</H3>

<P>The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
Licenses are intended to guarantee your freedom to share and change
free software--to make sure the software is free for all its users.

<P>This license, the Library General Public License, applies to some
specially designated Free Software Foundation software, and to any
other libraries whose authors decide to use it.  You can use it for
your libraries, too.

<P>When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

<P>To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if
you distribute copies of the library, or if you modify it.

<P>For example, if you distribute copies of the library, whether gratis
or for a fee, you must give the recipients all the rights that we gave
you.  You must make sure that they, too, receive or can get the source
code.  If you link a program with the library, you must provide
complete object files to the recipients so that they can relink them
with the library, after making changes to the library and recompiling
it.  And you must show them these terms so they know their rights.

<P>Our method of protecting your rights has two steps: (1) copyright
the library, and (2) offer you this license which gives you legal
permission to copy, distribute and/or modify the library.

<P>Also, for each distributor's protection, we want to make certain
that everyone understands that there is no warranty for this free
library.  If the library is modified by someone else and passed on, we
want its recipients to know that what they have is not the original
version, so that any problems introduced by others will not reflect on
the original authors' reputations.

<P>Finally, any free program is threatened constantly by software
patents.  We wish to avoid the danger that companies distributing free
software will individually obtain patent licenses, thus in effect
transforming the program into proprietary software.  To prevent this,
we have made it clear that any patent must be licensed for everyone's
free use or not licensed at all.

<P>Most GNU software, including some libraries, is covered by the ordinary
GNU General Public License, which was designed for utility programs.  This
license, the GNU Library General Public License, applies to certain
designated libraries.  This license is quite different from the ordinary
one; be sure to read it in full, and don't assume that anything in it is
the same as in the ordinary license.

<P>The reason we have a separate public license for some libraries is that
they blur the distinction we usually make between modifying or adding to a
program and simply using it.  Linking a program with a library, without
changing the library, is in some sense simply using the library, and is
analogous to running a utility program or application program.  However, in
a textual and legal sense, the linked executable is a combined work, a
derivative of the original library, and the ordinary General Public License
treats it as such.

<P>Because of this blurred distinction, using the ordinary General
Public License for libraries did not effectively promote software
sharing, because most developers did not use the libraries.  We
concluded that weaker conditions might promote sharing better.

<P>However, unrestricted linking of non-free programs would deprive the
users of those programs of all benefit from the free status of the
libraries themselves.  This Library General Public License is intended to
permit developers of non-free programs to use free libraries, while
preserving your freedom as a user of such programs to change the free
libraries that are incorporated in them.  (We have not seen how to achieve
this as regards changes in header files, but we have achieved it as regards
changes in the actual functions of the Library.)  The hope is that this
will lead to faster development of free libraries.

<P>The precise terms and conditions for copying, distribution and
modification follow.  Pay close attention to the difference between a
"work based on the library" and a "work that uses the library".  The
former contains code derived from the library, while the latter only
works together with the library.

<P>Note that it is possible for a library to be covered by the ordinary
General Public License rather than by this special one.

<H3>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>

<P><STRONG>0.</STRONG>
This License Agreement applies to any software library which
contains a notice placed by the copyright holder or other authorized
party saying it may be distributed under the terms of this Library
General Public License (also called "this License").  Each licensee is
addressed as "you".

<P>A "library" means a collection of software functions and/or data
prepared so as to be conveniently linked with application programs
(which use some of those functions and data) to form executables.

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<H3>How to Apply These Terms to Your New Libraries</H3>

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<PRE>
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<P>Also add information on how to contact you by electronic and paper mail.

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<PRE>
Yoyodyne, Inc., hereby disclaims all copyright interest in
the library `Frob' (a library for tweaking knobs) written
by James Random Hacker.

<VAR>signature of Ty Coon</VAR>, 1 April 1990
Ty Coon, President of Vice
</PRE>

<P>That's all there is to it!

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