doc/help/license.html

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   4         <TITLE>Software License Agreement</TITLE>
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   7
   8 <P ALIGN="CENTER">Copyright 1997-2006 by Easy Software Products<BR>
   9 44141 AIRPORT VIEW DR STE 204<BR>
  10 HOLLYWOOD, MARYLAND 20636 USA<BR>
  11 <BR>
  12 Voice: +1.301.373.9600<BR>
  13 Email: <A HREF="mailto:cups-info@cups.org">cups-info@cups.org</A><BR>
  14 WWW: <A HREF="http://www.cups.org">http://www.cups.org</A>
  15
  16 <H2 CLASS="title"><A NAME="INTRO">Introduction</A></H2>
  17
  18 <P>The Common UNIX Printing System<SUP>TM</SUP>,
  19 ("CUPS<SUP>TM</SUP>"), is provided under the GNU General Public
  20 License ("GPL") and GNU Library General Public License ("LGPL"),
  21 Version 2, with exceptions for Apple operating systems and the
  22 OpenSSL toolkit. A copy of the exceptions and licenses follow
  23 this introduction.</P>
  24
  25 <P>The GNU LGPL applies to the CUPS API library, located in the
  26 "cups" subdirectory of the CUPS source distribution and in the
  27 "cups" include directory and library files in the binary
  28 distributions. The GNU GPL applies to the remainder of the CUPS
  29 distribution, including the "pdftops" filter which is based upon
  30 Xpdf and the CUPS imaging library.</P>
  31
  32 <P>For those not familiar with the GNU GPL, the license basically
  33 allows you to:</P>
  34
  35 <UL>
  36
  37         <LI>Use the CUPS software at no charge.</LI>
  38
  39         <LI>Distribute verbatim copies of the software in source
  40         or binary form.</LI>
  41
  42         <LI>Sell verbatim copies of the software for a media
  43         fee, or sell support for the software.</LI>
  44
  45         <LI>Distribute or sell printer drivers and filters that
  46         use CUPS so long as source code is made available under
  47         the GPL.</LI>
  48
  49 </UL>
  50
  51 <P>What this license <EM>does not</EM> allow you to do is make
  52 changes or add features to CUPS and then sell a binary
  53 distribution without source code. You must provide source for any
  54 new drivers, changes, or additions to the software, and all code
  55 must be provided under the GPL or LGPL as appropriate. The only
  56 exceptions to this are the portions of the CUPS software covered
  57 by the Apple operating system license exceptions outlined later
  58 in this license agreement.</P>
  59
  60 <P>The GNU LGPL relaxes the "link-to" restriction, allowing you
  61 to develop applications that use the CUPS API library under other
  62 licenses and/or conditions as appropriate for your
  63 application.</P>
  64
  65
  66 <H2 CLASS="title"><A NAME="EXCEPTIONS">License Exceptions</A></H2>
  67
  68 <P>In addition, as the copyright holder of CUPS, Easy Software
  69 Products grants the following special exceptions:</P>
  70
  71 <OL>
  72
  73         <LI><B>Apple Operating System Development License
  74         Exception</B>;
  75
  76         <OL TYPE="a">
  77
  78                 <LI>Software that is developed by any person or
  79                 entity for an Apple Operating System ("Apple
  80                 OS-Developed Software"), including but not
  81                 limited to Apple and third party printer
  82                 drivers, filters, and backends for an Apple
  83                 Operating System, that is linked to the CUPS
  84                 imaging library or based on any sample filters
  85                 or backends provided with CUPS shall not be
  86                 considered to be a derivative work or collective
  87                 work based on the CUPS program and is exempt
  88                 from the mandatory source code release clauses
  89                 of the GNU GPL. You may therefore distribute
  90                 linked combinations of the CUPS imaging library
  91                 with Apple OS-Developed Software without
  92                 releasing the source code of the Apple
  93                 OS-Developed Software. You may also use sample
  94                 filters and backends provided with CUPS to
  95                 develop Apple OS-Developed Software without
  96                 releasing the source code of the Apple
  97                 OS-Developed Software.</LI>
  98
  99                 <LI>An Apple Operating System means any
 100                 operating system software developed and/or
 101                 marketed by Apple Computer, Inc., including but
 102                 not limited to all existing releases and
 103                 versions of Apple's Darwin, Mac OS X, and Mac OS
 104                 X Server products and all follow-on releases and
 105                 future versions thereof.</LI>
 106
 107                 <LI>This exception is only available for Apple
 108                 OS-Developed Software and does not apply to
 109                 software that is distributed for use on other
 110                 operating systems.</LI>
 111
 112                 <LI>All CUPS software that falls under this
 113                 license exception have the following text at the
 114                 top of each source file:
 115
 116                 <BLOCKQUOTE>This file is subject to the Apple
 117                 OS-Developed Software
 118                 exception.</BLOCKQUOTE></LI>
 119
 120         </OL>
 121
 122         <LI><B>OpenSSL Toolkit License Exception</B>;
 123
 124         <OL TYPE="a">
 125
 126                 <LI>Easy Software Products explicitly allows the
 127                 compilation and distribution of the CUPS
 128                 software with the OpenSSL Toolkit.</LI>
 129
 130         </OL>
 131
 132 </OL>
 133
 134 <P>No developer is required to provide these exceptions in a
 135 derived work.</P>
 136
 137
 138 <H2 CLASS="title"><A NAME="TRADEMARKS">Trademarks</A></H2>
 139
 140 <P>Easy Software Products has trademarked the Common UNIX
 141 Printing System, CUPS, and CUPS logo. You may use these names and
 142 logos in any direct port or binary distribution of CUPS. Please
 143 contact Easy Software Products for written permission to use them
 144 in derivative products. Our intention is to protect the value of
 145 these trademarks and ensure that any derivative product meets the
 146 same high-quality standards as the original.</P>
 147
 148
 149 <H2 CLASS="title"><A NAME="BINARY">Binary Distribution Rights</A></H2>
 150
 151 <P>Easy Software Products also sells rights to the CUPS source
 152 code under a binary distribution license for vendors that are
 153 unable to release source code for their drivers, additions, and
 154 modifications to CUPS under the GNU GPL and LGPL. For information
 155 please contact us at the address shown above.</P>
 156
 157 <P>The Common UNIX Printing System provides a "pdftops" filter
 158 that is based on the Xpdf software. For binary distribution
 159 licensing of this software, please contact:</P>
 160
 161 <BLOCKQUOTE>
 162 Derek B. Noonburg<BR>
 163 Email: <A HREF="mailto:derekn@glyphandcog.com">derekn@glyphandcog.com</A><BR>
 164 WWW: <A HREF="http://www.glyphandcog.com/">http://www.glyphandcog.com/</A>
 165 </BLOCKQUOTE>
 166
 167
 168 <H2 CLASS="title"><A NAME="SUPPORT">Support</A></H2>
 169
 170 <P>Easy Software Products sells software support for CUPS as well
 171 as a commercial printing product based on CUPS called ESP Print
 172 Pro. You can find out more at our web site:</P>
 173
 174 <UL><PRE>
 175 <A HREF="http://www.easysw.com/">http://www.easysw.com/</A>
 176 </PRE></UL>
 177
 178
 179 <H2 CLASS="title"><A NAME="GPL">GNU GENERAL PUBLIC LICENSE</A></H2>
 180
 181 <P>Version 2, June 1991
 182
 183 <PRE>
 184 Copyright 1989, 1991 Free Software Foundation, Inc.
 185 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 186
 187 Everyone is permitted to copy and distribute verbatim
 188 copies of this license document, but changing it is not allowed.
 189 </PRE>
 190
 191 <H3>Preamble</H3>
 192
 193 <P>The licenses for most software are designed to take away your
 194 freedom to share and change it.  By contrast, the GNU General Public
 195 License is intended to guarantee your freedom to share and change free
 196 software--to make sure the software is free for all its users.  This
 197 General Public License applies to most of the Free Software
 198 Foundation's software and to any other program whose authors commit to
 199 using it.  (Some other Free Software Foundation software is covered by
 200 the GNU Library General Public License instead.)  You can apply it to
 201 your programs, too.
 202
 203 <P>When we speak of free software, we are referring to freedom, not
 204 price.  Our General Public Licenses are designed to make sure that you
 205 have the freedom to distribute copies of free software (and charge for
 206 this service if you wish), that you receive source code or can get it
 207 if you want it, that you can change the software or use pieces of it
 208 in new free programs; and that you know you can do these things.
 209
 210 <P>To protect your rights, we need to make restrictions that forbid
 211 anyone to deny you these rights or to ask you to surrender the rights.
 212 These restrictions translate to certain responsibilities for you if you
 213 distribute copies of the software, or if you modify it.
 214
 215 <P>For example, if you distribute copies of such a program, whether
 216 gratis or for a fee, you must give the recipients all the rights that
 217 you have.  You must make sure that they, too, receive or can get the
 218 source code.  And you must show them these terms so they know their
 219 rights.
 220
 221 <P>We protect your rights with two steps: (1) copyright the software, and
 222 (2) offer you this license which gives you legal permission to copy,
 223 distribute and/or modify the software.
 224
 225 <P>Also, for each author's protection and ours, we want to make certain
 226 that everyone understands that there is no warranty for this free
 227 software.  If the software is modified by someone else and passed on, we
 228 want its recipients to know that what they have is not the original, so
 229 that any problems introduced by others will not reflect on the original
 230 authors' reputations.
 231
 232 <P>Finally, any free program is threatened constantly by software
 233 patents.  We wish to avoid the danger that redistributors of a free
 234 program will individually obtain patent licenses, in effect making the
 235 program proprietary.  To prevent this, we have made it clear that any
 236 patent must be licensed for everyone's free use or not licensed at all.
 237
 238 <P>The precise terms and conditions for copying, distribution and
 239 modification follow.
 240
 241 <H3>GNU GENERAL PUBLIC LICENSE<BR>
 242 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>
 243
 244 <OL START="0">
 245
 246 <LI>This License applies to any program or other work which contains
 247 a notice placed by the copyright holder saying it may be distributed
 248 under the terms of this General Public License.  The "Program", below,
 249 refers to any such program or work, and a "work based on the Program"
 250 means either the Program or any derivative work under copyright law:
 251 that is to say, a work containing the Program or a portion of it,
 252 either verbatim or with modifications and/or translated into another
 253 language.  (Hereinafter, translation is included without limitation in
 254 the term "modification".)  Each licensee is addressed as "you".
 255
 256 <P>Activities other than copying, distribution and modification are not
 257 covered by this License; they are outside its scope.  The act of
 258 running the Program is not restricted, and the output from the Program
 259 is covered only if its contents constitute a work based on the
 260 Program (independent of having been made by running the Program).
 261 Whether that is true depends on what the Program does.
 262
 263 <LI>You may copy and distribute verbatim copies of the Program's
 264 source code as you receive it, in any medium, provided that you
 265 conspicuously and appropriately publish on each copy an appropriate
 266 copyright notice and disclaimer of warranty; keep intact all the
 267 notices that refer to this License and to the absence of any warranty;
 268 and give any other recipients of the Program a copy of this License
 269 along with the Program.
 270
 271 <P>You may charge a fee for the physical act of transferring a copy, and
 272 you may at your option offer warranty protection in exchange for a fee.
 273
 274 <LI>You may modify your copy or copies of the Program or any portion
 275 of it, thus forming a work based on the Program, and copy and
 276 distribute such modifications or work under the terms of Section 1
 277 above, provided that you also meet all of these conditions:
 278
 279 <OL TYPE="a">
 280
 281 <LI>You must cause the modified files to carry prominent notices
 282 stating that you changed the files and the date of any change.
 283
 284 <LI>You must cause any work that you distribute or publish, that in
 285 whole or in part contains or is derived from the Program or any
 286 part thereof, to be licensed as a whole at no charge to all third
 287 parties under the terms of this License.
 288
 289 <LI>if the modified program normally reads commands interactively
 290 when run, you must cause it, when started running for such
 291 interactive use in the most ordinary way, to print or display an
 292 announcement including an appropriate copyright notice and a
 293 notice that there is no warranty (or else, saying that you provide
 294 a warranty) and that users may redistribute the program under
 295 these conditions, and telling the user how to view a copy of this
 296 License.  (Exception: if the Program itself is interactive but
 297 does not normally print such an announcement, your work based on
 298 the Program is not required to print an announcement.)
 299
 300 </OL>
 301
 302 <P>These requirements apply to the modified work as a whole.  If
 303 identifiable sections of that work are not derived from the Program,
 304 and can be reasonably considered independent and separate works in
 305 themselves, then this License, and its terms, do not apply to those
 306 sections when you distribute them as separate works.  But when you
 307 distribute the same sections as part of a whole which is a work based
 308 on the Program, the distribution of the whole must be on the terms of
 309 this License, whose permissions for other licensees extend to the
 310 entire whole, and thus to each and every part regardless of who wrote it.
 311
 312 <P>Thus, it is not the intent of this section to claim rights or contest
 313 your rights to work written entirely by you; rather, the intent is to
 314 exercise the right to control the distribution of derivative or
 315 collective works based on the Program.
 316
 317 <P>In addition, mere aggregation of another work not based on the Program
 318 with the Program (or with a work based on the Program) on a volume of
 319 a storage or distribution medium does not bring the other work under
 320 the scope of this License.
 321
 322 <LI>You may copy and distribute the Program (or a work based on it,
 323 under Section 2) in object code or executable form under the terms of
 324 Sections 1 and 2 above provided that you also do one of the following:
 325
 326 <OL TYPE="a">
 327
 328 <LI>Accompany it with the complete corresponding machine-readable
 329 source code, which must be distributed under the terms of Sections
 330 1 and 2 above on a medium customarily used for software interchange; or,
 331
 332 <LI>Accompany it with a written offer, valid for at least three
 333 years, to give any third party, for a charge no more than your
 334 cost of physically performing source distribution, a complete
 335 machine-readable copy of the corresponding source code, to be
 336 distributed under the terms of Sections 1 and 2 above on a medium
 337 customarily used for software interchange; or,
 338
 339 <LI>Accompany it with the information you received as to the offer
 340 to distribute corresponding source code.  (This alternative is
 341 allowed only for noncommercial distribution and only if you
 342 received the program in object code or executable form with such
 343 an offer, in accord with Subsection b above.)
 344
 345 </OL>
 346
 347 <P>The source code for a work means the preferred form of the work for
 348 making modifications to it.  For an executable work, complete source
 349 code means all the source code for all modules it contains, plus any
 350 associated interface definition files, plus the scripts used to
 351 control compilation and installation of the executable.  However, as a
 352 special exception, the source code distributed need not include
 353 anything that is normally distributed (in either source or binary
 354 form) with the major components (compiler, kernel, and so on) of the
 355 operating system on which the executable runs, unless that component
 356 itself accompanies the executable.
 357
 358 <P>If distribution of executable or object code is made by offering
 359 access to copy from a designated place, then offering equivalent
 360 access to copy the source code from the same place counts as
 361 distribution of the source code, even though third parties are not
 362 compelled to copy the source along with the object code.
 363
 364 <LI>You may not copy, modify, sublicense, or distribute the Program
 365 except as expressly provided under this License.  Any attempt
 366 otherwise to copy, modify, sublicense or distribute the Program is
 367 void, and will automatically terminate your rights under this License.
 368 However, parties who have received copies, or rights, from you under
 369 this License will not have their licenses terminated so long as such
 370 parties remain in full compliance.
 371
 372 <LI>You are not required to accept this License, since you have not
 373 signed it.  However, nothing else grants you permission to modify or
 374 distribute the Program or its derivative works.  These actions are
 375 prohibited by law if you do not accept this License.  Therefore, by
 376 modifying or distributing the Program (or any work based on the
 377 Program), you indicate your acceptance of this License to do so, and
 378 all its terms and conditions for copying, distributing or modifying
 379 the Program or works based on it.
 380
 381 <LI>Each time you redistribute the Program (or any work based on the
 382 Program), the recipient automatically receives a license from the
 383 original licensor to copy, distribute or modify the Program subject to
 384 these terms and conditions.  You may not impose any further
 385 restrictions on the recipients' exercise of the rights granted herein.
 386 You are not responsible for enforcing compliance by third parties to
 387 this License.
 388
 389 <LI>If, as a consequence of a court judgment or allegation of patent
 390 infringement or for any other reason (not limited to patent issues),
 391 conditions are imposed on you (whether by court order, agreement or
 392 otherwise) that contradict the conditions of this License, they do not
 393 excuse you from the conditions of this License.  If you cannot
 394 distribute so as to satisfy simultaneously your obligations under this
 395 License and any other pertinent obligations, then as a consequence you
 396 may not distribute the Program at all.  For example, if a patent
 397 license would not permit royalty-free redistribution of the Program by
 398 all those who receive copies directly or indirectly through you, then
 399 the only way you could satisfy both it and this License would be to
 400 refrain entirely from distribution of the Program.
 401
 402 <P>If any portion of this section is held invalid or unenforceable under
 403 any particular circumstance, the balance of the section is intended to
 404 apply and the section as a whole is intended to apply in other
 405 circumstances.
 406
 407 <P>It is not the purpose of this section to induce you to infringe any
 408 patents or other property right claims or to contest validity of any
 409 such claims; this section has the sole purpose of protecting the
 410 integrity of the free software distribution system, which is
 411 implemented by public license practices.  Many people have made
 412 generous contributions to the wide range of software distributed
 413 through that system in reliance on consistent application of that
 414 system; it is up to the author/donor to decide if he or she is willing
 415 to distribute software through any other system and a licensee cannot
 416 impose that choice.
 417
 418 <P>This section is intended to make thoroughly clear what is believed to
 419 be a consequence of the rest of this License.
 420
 421 <LI>If the distribution and/or use of the Program is restricted in
 422 certain countries either by patents or by copyrighted interfaces, the
 423 original copyright holder who places the Program under this License
 424 may add an explicit geographical distribution limitation excluding
 425 those countries, so that distribution is permitted only in or among
 426 countries not thus excluded.  In such case, this License incorporates
 427 the limitation as if written in the body of this License.
 428
 429 <LI>The Free Software Foundation may publish revised and/or new versions
 430 of the General Public License from time to time.  Such new versions will
 431 be similar in spirit to the present version, but may differ in detail to
 432 address new problems or concerns.
 433
 434 <P>Each version is given a distinguishing version number.  If the Program
 435 specifies a version number of this License which applies to it and "any
 436 later version", you have the option of following the terms and conditions
 437 either of that version or of any later version published by the Free
 438 Software Foundation.  If the Program does not specify a version number of
 439 this License, you may choose any version ever published by the Free Software
 440 Foundation.
 441
 442 <LI>If you wish to incorporate parts of the Program into other free
 443 programs whose distribution conditions are different, write to the author
 444 to ask for permission.  For software which is copyrighted by the Free
 445 Software Foundation, write to the Free Software Foundation; we sometimes
 446 make exceptions for this.  Our decision will be guided by the two goals
 447 of preserving the free status of all derivatives of our free software and
 448 of promoting the sharing and reuse of software generally.
 449
 450 </OL>
 451
 452 <H3>NO WARRANTY</H3>
 453
 454 <OL START="11">
 455
 456 <LI>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 457 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 458 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 459 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 460 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 461 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 462 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 463 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 464 REPAIR OR CORRECTION.
 465
 466 <LI>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 467 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 468 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 469 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 470 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 471 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 472 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 473 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 474 POSSIBILITY OF SUCH DAMAGES.
 475
 476 </OL>
 477
 478 <H3>END OF TERMS AND CONDITIONS</H3>
 479
 480 <H3>How to Apply These Terms to Your New Programs</H3>
 481
 482 <P>If you develop a new program, and you want it to be of the greatest
 483 possible use to the public, the best way to achieve this is to make it
 484 free software which everyone can redistribute and change under these terms.
 485
 486 <P>To do so, attach the following notices to the program.  It is safest
 487 to attach them to the start of each source file to most effectively
 488 convey the exclusion of warranty; and each file should have at least
 489 the "copyright" line and a pointer to where the full notice is found.
 490
 491 <PRE>
 492 <VAR>one line to give the program's name and an idea of what it does.</VAR>
 493 Copyright (C) <VAR>yyyy</VAR>  <VAR>name of author</VAR>
 494
 495 This program is free software; you can redistribute it and/or
 496 modify it under the terms of the GNU General Public License
 497 as published by the Free Software Foundation; either version 2
 498 of the License, or (at your option) any later version.
 499
 500 This program is distributed in the hope that it will be useful,
 501 but WITHOUT ANY WARRANTY; without even the implied warranty of
 502 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 503 GNU General Public License for more details.
 504
 505 You should have received a copy of the GNU General Public License
 506 along with this program; if not, write to the Free Software
 507 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 508 </PRE>
 509
 510 <P>Also add information on how to contact you by electronic and paper mail.
 511
 512 <P>If the program is interactive, make it output a short notice like this
 513 when it starts in an interactive mode:
 514
 515 <PRE>
 516 Gnomovision version 69, Copyright (C) <VAR>year</VAR> <VAR>name of author</VAR>
 517 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 518 type `show w'.  This is free software, and you are welcome
 519 to redistribute it under certain conditions; type `show c'
 520 for details.
 521 </PRE>
 522
 523 <P>The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
 524 the appropriate parts of the General Public License.  Of course, the
 525 commands you use may be called something other than <SAMP>`show w'</SAMP> and
 526 <SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
 527 suits your program.
 528
 529 <P>You should also get your employer (if you work as a programmer) or your
 530 school, if any, to sign a "copyright disclaimer" for the program, if
 531 necessary.  Here is a sample; alter the names:
 532
 533 <PRE>
 534 Yoyodyne, Inc., hereby disclaims all copyright
 535 interest in the program `Gnomovision'
 536 (which makes passes at compilers) written
 537 by James Hacker.
 538
 539 <VAR>signature of Ty Coon</VAR>, 1 April 1989
 540 Ty Coon, President of Vice
 541 </PRE>
 542
 543 <H2 CLASS="title"><A NAME="LGPL">GNU LIBRARY GENERAL PUBLIC LICENSE</A></H2>
 544
 545 <P>Version 2, June 1991
 546
 547 <PRE>
 548 Copyright (C) 1991 Free Software Foundation, Inc.
 549 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 550 Everyone is permitted to copy and distribute verbatim copies
 551 of this license document, but changing it is not allowed.
 552
 553 [This is the first released version of the library GPL.  It is
 554  numbered 2 because it goes with version 2 of the ordinary GPL.]
 555 </PRE>
 556
 557 <H3>Preamble</H3>
 558
 559 <P>The licenses for most software are designed to take away your
 560 freedom to share and change it.  By contrast, the GNU General Public
 561 Licenses are intended to guarantee your freedom to share and change
 562 free software--to make sure the software is free for all its users.
 563
 564 <P>This license, the Library General Public License, applies to some
 565 specially designated Free Software Foundation software, and to any
 566 other libraries whose authors decide to use it.  You can use it for
 567 your libraries, too.
 568
 569 <P>When we speak of free software, we are referring to freedom, not
 570 price.  Our General Public Licenses are designed to make sure that you
 571 have the freedom to distribute copies of free software (and charge for
 572 this service if you wish), that you receive source code or can get it
 573 if you want it, that you can change the software or use pieces of it
 574 in new free programs; and that you know you can do these things.
 575
 576 <P>To protect your rights, we need to make restrictions that forbid
 577 anyone to deny you these rights or to ask you to surrender the rights.
 578 These restrictions translate to certain responsibilities for you if
 579 you distribute copies of the library, or if you modify it.
 580
 581 <P>For example, if you distribute copies of the library, whether gratis
 582 or for a fee, you must give the recipients all the rights that we gave
 583 you.  You must make sure that they, too, receive or can get the source
 584 code.  If you link a program with the library, you must provide
 585 complete object files to the recipients so that they can relink them
 586 with the library, after making changes to the library and recompiling
 587 it.  And you must show them these terms so they know their rights.
 588
 589 <P>Our method of protecting your rights has two steps: (1) copyright
 590 the library, and (2) offer you this license which gives you legal
 591 permission to copy, distribute and/or modify the library.
 592
 593 <P>Also, for each distributor's protection, we want to make certain
 594 that everyone understands that there is no warranty for this free
 595 library.  If the library is modified by someone else and passed on, we
 596 want its recipients to know that what they have is not the original
 597 version, so that any problems introduced by others will not reflect on
 598 the original authors' reputations.
 599
 600 <P>Finally, any free program is threatened constantly by software
 601 patents.  We wish to avoid the danger that companies distributing free
 602 software will individually obtain patent licenses, thus in effect
 603 transforming the program into proprietary software.  To prevent this,
 604 we have made it clear that any patent must be licensed for everyone's
 605 free use or not licensed at all.
 606
 607 <P>Most GNU software, including some libraries, is covered by the ordinary
 608 GNU General Public License, which was designed for utility programs.  This
 609 license, the GNU Library General Public License, applies to certain
 610 designated libraries.  This license is quite different from the ordinary
 611 one; be sure to read it in full, and don't assume that anything in it is
 612 the same as in the ordinary license.
 613
 614 <P>The reason we have a separate public license for some libraries is that
 615 they blur the distinction we usually make between modifying or adding to a
 616 program and simply using it.  Linking a program with a library, without
 617 changing the library, is in some sense simply using the library, and is
 618 analogous to running a utility program or application program.  However, in
 619 a textual and legal sense, the linked executable is a combined work, a
 620 derivative of the original library, and the ordinary General Public License
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1057 <PRE>
1058 Yoyodyne, Inc., hereby disclaims all copyright interest in
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1061
1062 <VAR>signature of Ty Coon</VAR>, 1 April 1990
1063 Ty Coon, President of Vice
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