doc/help/license.html

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   4         <TITLE>Software License Agreement</TITLE>
   5 </HEAD>
   6 <BODY>
   7
   8 <P ALIGN="CENTER">Copyright 2007 by Apple Inc.<BR>
   9 1 Infinite Loop<BR>
  10 Cupertino, CA 95014 USA<BR>
  11 <BR>
  12 WWW: <A HREF="http://www.cups.org/">http://www.cups.org/</A>
  13
  14 <H2 CLASS="title"><A NAME="INTRO">Introduction</A></H2>
  15
  16 <P>The Common UNIX Printing System<SUP>TM</SUP>,
  17 ("CUPS<SUP>TM</SUP>"), is provided under the GNU General Public
  18 License ("GPL") and GNU Library General Public License ("LGPL"),
  19 Version 2, with exceptions for Apple operating systems and the
  20 OpenSSL toolkit. A copy of the exceptions and licenses follow
  21 this introduction.</P>
  22
  23 <P>The GNU LGPL applies to the CUPS and CUPS Imaging libraries
  24 located in the "cups" and "filter" subdirectories of the CUPS
  25 source distribution and in the "cups" include directory and
  26 library files in the binary distributions. The GNU GPL applies to
  27 the remainder of the CUPS distribution, including the "pdftops"
  28 filter which is based upon Xpdf.</P>
  29
  30 <P>For those not familiar with the GNU GPL, the license basically
  31 allows you to:</P>
  32
  33 <UL>
  34
  35         <LI>Use the CUPS software at no charge.</LI>
  36
  37         <LI>Distribute verbatim copies of the software in source
  38         or binary form.</LI>
  39
  40         <LI>Sell verbatim copies of the software for a media
  41         fee, or sell support for the software.</LI>
  42
  43 </UL>
  44
  45 <P>What this license <EM>does not</EM> allow you to do is make
  46 changes or add features to CUPS and then sell a binary
  47 distribution without source code. You must provide source for any
  48 changes or additions to the software, and all code must be
  49 provided under the GPL or LGPL as appropriate. The only
  50 exceptions to this are the portions of the CUPS software covered
  51 by the Apple operating system license exceptions outlined later
  52 in this license agreement.</P>
  53
  54 <P>The GNU LGPL relaxes the "link-to" restriction, allowing you
  55 to develop applications that use the CUPS and CUPS Imaging
  56 libraries under other licenses and/or conditions as appropriate
  57 for your application, driver, or filter.</P>
  58
  59
  60 <H2 CLASS="title"><A NAME="EXCEPTIONS">License Exceptions</A></H2>
  61
  62 <P>In addition, as the copyright holder of CUPS, Apple Inc. grants
  63 the following special exceptions:</P>
  64
  65 <OL>
  66
  67         <LI><B>Apple Operating System Development License
  68         Exception</B>;
  69
  70         <OL TYPE="a">
  71
  72                 <LI>Software that is developed by any person or
  73                 entity for an Apple Operating System ("Apple
  74                 OS-Developed Software"), including but not
  75                 limited to Apple and third party printer
  76                 drivers, filters, and backends for an Apple
  77                 Operating System, that is linked to the CUPS
  78                 imaging library or based on any sample filters
  79                 or backends provided with CUPS shall not be
  80                 considered to be a derivative work or collective
  81                 work based on the CUPS program and is exempt
  82                 from the mandatory source code release clauses
  83                 of the GNU GPL. You may therefore distribute
  84                 linked combinations of the CUPS imaging library
  85                 with Apple OS-Developed Software without
  86                 releasing the source code of the Apple
  87                 OS-Developed Software. You may also use sample
  88                 filters and backends provided with CUPS to
  89                 develop Apple OS-Developed Software without
  90                 releasing the source code of the Apple
  91                 OS-Developed Software.</LI>
  92
  93                 <LI>An Apple Operating System means any
  94                 operating system software developed and/or
  95                 marketed by Apple Computer, Inc., including but
  96                 not limited to all existing releases and
  97                 versions of Apple's Darwin, Mac OS X, and Mac OS
  98                 X Server products and all follow-on releases and
  99                 future versions thereof.</LI>
 100
 101                 <LI>This exception is only available for Apple
 102                 OS-Developed Software and does not apply to
 103                 software that is distributed for use on other
 104                 operating systems.</LI>
 105
 106                 <LI>All CUPS software that falls under this
 107                 license exception have the following text at the
 108                 top of each source file:
 109
 110                 <BLOCKQUOTE>This file is subject to the Apple
 111                 OS-Developed Software
 112                 exception.</BLOCKQUOTE></LI>
 113
 114         </OL>
 115
 116         <LI><B>OpenSSL Toolkit License Exception</B>;
 117
 118         <OL TYPE="a">
 119
 120                 <LI>Apple Inc. explicitly allows the
 121                 compilation and distribution of the CUPS
 122                 software with the OpenSSL Toolkit.</LI>
 123
 124         </OL>
 125
 126 </OL>
 127
 128 <P>No developer is required to provide these exceptions in a
 129 derived work.</P>
 130
 131
 132 <H2 CLASS="title"><A NAME="KERBEROS">Kerberos Support Code</A></H2>
 133
 134 <P>The Kerberos support code ("KSC") is copyright 2006 by Jelmer
 135 Vernooij and is provided 'as-is', without any express or implied
 136 warranty. In no event will the author or Apple Inc. be held liable
 137 for any damages arising from the use of the KSC.</P>
 138
 139 <P>Sources files containing KSC have the following text at the top
 140 of each source file:</P>
 141
 142 <BLOCKQUOTE>This file contains Kerberos support code, copyright
 143 2006 by Jelmer Vernooij.</BLOCKQUOTE>
 144
 145 <P>The KSC copyright and license apply <EM>only</EM> to
 146 Kerberos-related feature code in CUPS. Such code is typically
 147 conditionally compiled based on the present of the
 148 <TT>HAVE_GSSAPI</TT> preprocessor definition.</P>
 149
 150 <P>Permission is granted to anyone to use the KSC for any
 151 purpose, including commercial applications, and to alter it and
 152 redistribute it freely, subject to the following
 153 restrictions:</P>
 154
 155 <OL>
 156
 157         <LI>The origin of the KSC must not be misrepresented; you
 158         must not claim that you wrote the original software. If
 159         you use the KSC in a product, an acknowledgment in the
 160         product documentation would be appreciated but is not
 161         required.</LI>
 162
 163         <LI>Altered source versions must be plainly marked as
 164         such, and must not be misrepresented as being the
 165         original software.</LI>
 166
 167         <LI>This notice may not be removed or altered from any
 168         source distribution.</LI>
 169
 170 </OL>
 171
 172
 173 <H2 CLASS="title"><A NAME="TRADEMARKS">Trademarks</A></H2>
 174
 175 <P>Apple Inc. has trademarked the Common UNIX
 176 Printing System, CUPS, and CUPS logo. You may use these names and
 177 logos in any direct port or binary distribution of CUPS. Please
 178 contact Apple Inc. for written permission to use them
 179 in derivative products. Our intention is to protect the value of
 180 these trademarks and ensure that any derivative product meets the
 181 same high-quality standards as the original.</P>
 182
 183 <H2 CLASS="title"><A NAME="GPL">GNU GENERAL PUBLIC LICENSE</A></H2>
 184
 185 <P>Version 2, June 1991
 186
 187 <PRE>
 188 Copyright 1989, 1991 Free Software Foundation, Inc.
 189 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 190
 191 Everyone is permitted to copy and distribute verbatim
 192 copies of this license document, but changing it is not allowed.
 193 </PRE>
 194
 195 <H3>Preamble</H3>
 196
 197 <P>The licenses for most software are designed to take away your
 198 freedom to share and change it.  By contrast, the GNU General Public
 199 License is intended to guarantee your freedom to share and change free
 200 software--to make sure the software is free for all its users.  This
 201 General Public License applies to most of the Free Software
 202 Foundation's software and to any other program whose authors commit to
 203 using it.  (Some other Free Software Foundation software is covered by
 204 the GNU Library General Public License instead.)  You can apply it to
 205 your programs, too.
 206
 207 <P>When we speak of free software, we are referring to freedom, not
 208 price.  Our General Public Licenses are designed to make sure that you
 209 have the freedom to distribute copies of free software (and charge for
 210 this service if you wish), that you receive source code or can get it
 211 if you want it, that you can change the software or use pieces of it
 212 in new free programs; and that you know you can do these things.
 213
 214 <P>To protect your rights, we need to make restrictions that forbid
 215 anyone to deny you these rights or to ask you to surrender the rights.
 216 These restrictions translate to certain responsibilities for you if you
 217 distribute copies of the software, or if you modify it.
 218
 219 <P>For example, if you distribute copies of such a program, whether
 220 gratis or for a fee, you must give the recipients all the rights that
 221 you have.  You must make sure that they, too, receive or can get the
 222 source code.  And you must show them these terms so they know their
 223 rights.
 224
 225 <P>We protect your rights with two steps: (1) copyright the software, and
 226 (2) offer you this license which gives you legal permission to copy,
 227 distribute and/or modify the software.
 228
 229 <P>Also, for each author's protection and ours, we want to make certain
 230 that everyone understands that there is no warranty for this free
 231 software.  If the software is modified by someone else and passed on, we
 232 want its recipients to know that what they have is not the original, so
 233 that any problems introduced by others will not reflect on the original
 234 authors' reputations.
 235
 236 <P>Finally, any free program is threatened constantly by software
 237 patents.  We wish to avoid the danger that redistributors of a free
 238 program will individually obtain patent licenses, in effect making the
 239 program proprietary.  To prevent this, we have made it clear that any
 240 patent must be licensed for everyone's free use or not licensed at all.
 241
 242 <P>The precise terms and conditions for copying, distribution and
 243 modification follow.
 244
 245 <H3>GNU GENERAL PUBLIC LICENSE<BR>
 246 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>
 247
 248 <OL START="0">
 249
 250 <LI>This License applies to any program or other work which contains
 251 a notice placed by the copyright holder saying it may be distributed
 252 under the terms of this General Public License.  The "Program", below,
 253 refers to any such program or work, and a "work based on the Program"
 254 means either the Program or any derivative work under copyright law:
 255 that is to say, a work containing the Program or a portion of it,
 256 either verbatim or with modifications and/or translated into another
 257 language.  (Hereinafter, translation is included without limitation in
 258 the term "modification".)  Each licensee is addressed as "you".
 259
 260 <P>Activities other than copying, distribution and modification are not
 261 covered by this License; they are outside its scope.  The act of
 262 running the Program is not restricted, and the output from the Program
 263 is covered only if its contents constitute a work based on the
 264 Program (independent of having been made by running the Program).
 265 Whether that is true depends on what the Program does.
 266
 267 <LI>You may copy and distribute verbatim copies of the Program's
 268 source code as you receive it, in any medium, provided that you
 269 conspicuously and appropriately publish on each copy an appropriate
 270 copyright notice and disclaimer of warranty; keep intact all the
 271 notices that refer to this License and to the absence of any warranty;
 272 and give any other recipients of the Program a copy of this License
 273 along with the Program.
 274
 275 <P>You may charge a fee for the physical act of transferring a copy, and
 276 you may at your option offer warranty protection in exchange for a fee.
 277
 278 <LI>You may modify your copy or copies of the Program or any portion
 279 of it, thus forming a work based on the Program, and copy and
 280 distribute such modifications or work under the terms of Section 1
 281 above, provided that you also meet all of these conditions:
 282
 283 <OL TYPE="a">
 284
 285 <LI>You must cause the modified files to carry prominent notices
 286 stating that you changed the files and the date of any change.
 287
 288 <LI>You must cause any work that you distribute or publish, that in
 289 whole or in part contains or is derived from the Program or any
 290 part thereof, to be licensed as a whole at no charge to all third
 291 parties under the terms of this License.
 292
 293 <LI>if the modified program normally reads commands interactively
 294 when run, you must cause it, when started running for such
 295 interactive use in the most ordinary way, to print or display an
 296 announcement including an appropriate copyright notice and a
 297 notice that there is no warranty (or else, saying that you provide
 298 a warranty) and that users may redistribute the program under
 299 these conditions, and telling the user how to view a copy of this
 300 License.  (Exception: if the Program itself is interactive but
 301 does not normally print such an announcement, your work based on
 302 the Program is not required to print an announcement.)
 303
 304 </OL>
 305
 306 <P>These requirements apply to the modified work as a whole.  If
 307 identifiable sections of that work are not derived from the Program,
 308 and can be reasonably considered independent and separate works in
 309 themselves, then this License, and its terms, do not apply to those
 310 sections when you distribute them as separate works.  But when you
 311 distribute the same sections as part of a whole which is a work based
 312 on the Program, the distribution of the whole must be on the terms of
 313 this License, whose permissions for other licensees extend to the
 314 entire whole, and thus to each and every part regardless of who wrote it.
 315
 316 <P>Thus, it is not the intent of this section to claim rights or contest
 317 your rights to work written entirely by you; rather, the intent is to
 318 exercise the right to control the distribution of derivative or
 319 collective works based on the Program.
 320
 321 <P>In addition, mere aggregation of another work not based on the Program
 322 with the Program (or with a work based on the Program) on a volume of
 323 a storage or distribution medium does not bring the other work under
 324 the scope of this License.
 325
 326 <LI>You may copy and distribute the Program (or a work based on it,
 327 under Section 2) in object code or executable form under the terms of
 328 Sections 1 and 2 above provided that you also do one of the following:
 329
 330 <OL TYPE="a">
 331
 332 <LI>Accompany it with the complete corresponding machine-readable
 333 source code, which must be distributed under the terms of Sections
 334 1 and 2 above on a medium customarily used for software interchange; or,
 335
 336 <LI>Accompany it with a written offer, valid for at least three
 337 years, to give any third party, for a charge no more than your
 338 cost of physically performing source distribution, a complete
 339 machine-readable copy of the corresponding source code, to be
 340 distributed under the terms of Sections 1 and 2 above on a medium
 341 customarily used for software interchange; or,
 342
 343 <LI>Accompany it with the information you received as to the offer
 344 to distribute corresponding source code.  (This alternative is
 345 allowed only for noncommercial distribution and only if you
 346 received the program in object code or executable form with such
 347 an offer, in accord with Subsection b above.)
 348
 349 </OL>
 350
 351 <P>The source code for a work means the preferred form of the work for
 352 making modifications to it.  For an executable work, complete source
 353 code means all the source code for all modules it contains, plus any
 354 associated interface definition files, plus the scripts used to
 355 control compilation and installation of the executable.  However, as a
 356 special exception, the source code distributed need not include
 357 anything that is normally distributed (in either source or binary
 358 form) with the major components (compiler, kernel, and so on) of the
 359 operating system on which the executable runs, unless that component
 360 itself accompanies the executable.
 361
 362 <P>If distribution of executable or object code is made by offering
 363 access to copy from a designated place, then offering equivalent
 364 access to copy the source code from the same place counts as
 365 distribution of the source code, even though third parties are not
 366 compelled to copy the source along with the object code.
 367
 368 <LI>You may not copy, modify, sublicense, or distribute the Program
 369 except as expressly provided under this License.  Any attempt
 370 otherwise to copy, modify, sublicense or distribute the Program is
 371 void, and will automatically terminate your rights under this License.
 372 However, parties who have received copies, or rights, from you under
 373 this License will not have their licenses terminated so long as such
 374 parties remain in full compliance.
 375
 376 <LI>You are not required to accept this License, since you have not
 377 signed it.  However, nothing else grants you permission to modify or
 378 distribute the Program or its derivative works.  These actions are
 379 prohibited by law if you do not accept this License.  Therefore, by
 380 modifying or distributing the Program (or any work based on the
 381 Program), you indicate your acceptance of this License to do so, and
 382 all its terms and conditions for copying, distributing or modifying
 383 the Program or works based on it.
 384
 385 <LI>Each time you redistribute the Program (or any work based on the
 386 Program), the recipient automatically receives a license from the
 387 original licensor to copy, distribute or modify the Program subject to
 388 these terms and conditions.  You may not impose any further
 389 restrictions on the recipients' exercise of the rights granted herein.
 390 You are not responsible for enforcing compliance by third parties to
 391 this License.
 392
 393 <LI>If, as a consequence of a court judgment or allegation of patent
 394 infringement or for any other reason (not limited to patent issues),
 395 conditions are imposed on you (whether by court order, agreement or
 396 otherwise) that contradict the conditions of this License, they do not
 397 excuse you from the conditions of this License.  If you cannot
 398 distribute so as to satisfy simultaneously your obligations under this
 399 License and any other pertinent obligations, then as a consequence you
 400 may not distribute the Program at all.  For example, if a patent
 401 license would not permit royalty-free redistribution of the Program by
 402 all those who receive copies directly or indirectly through you, then
 403 the only way you could satisfy both it and this License would be to
 404 refrain entirely from distribution of the Program.
 405
 406 <P>If any portion of this section is held invalid or unenforceable under
 407 any particular circumstance, the balance of the section is intended to
 408 apply and the section as a whole is intended to apply in other
 409 circumstances.
 410
 411 <P>It is not the purpose of this section to induce you to infringe any
 412 patents or other property right claims or to contest validity of any
 413 such claims; this section has the sole purpose of protecting the
 414 integrity of the free software distribution system, which is
 415 implemented by public license practices.  Many people have made
 416 generous contributions to the wide range of software distributed
 417 through that system in reliance on consistent application of that
 418 system; it is up to the author/donor to decide if he or she is willing
 419 to distribute software through any other system and a licensee cannot
 420 impose that choice.
 421
 422 <P>This section is intended to make thoroughly clear what is believed to
 423 be a consequence of the rest of this License.
 424
 425 <LI>If the distribution and/or use of the Program is restricted in
 426 certain countries either by patents or by copyrighted interfaces, the
 427 original copyright holder who places the Program under this License
 428 may add an explicit geographical distribution limitation excluding
 429 those countries, so that distribution is permitted only in or among
 430 countries not thus excluded.  In such case, this License incorporates
 431 the limitation as if written in the body of this License.
 432
 433 <LI>The Free Software Foundation may publish revised and/or new versions
 434 of the General Public License from time to time.  Such new versions will
 435 be similar in spirit to the present version, but may differ in detail to
 436 address new problems or concerns.
 437
 438 <P>Each version is given a distinguishing version number.  If the Program
 439 specifies a version number of this License which applies to it and "any
 440 later version", you have the option of following the terms and conditions
 441 either of that version or of any later version published by the Free
 442 Software Foundation.  If the Program does not specify a version number of
 443 this License, you may choose any version ever published by the Free Software
 444 Foundation.
 445
 446 <LI>If you wish to incorporate parts of the Program into other free
 447 programs whose distribution conditions are different, write to the author
 448 to ask for permission.  For software which is copyrighted by the Free
 449 Software Foundation, write to the Free Software Foundation; we sometimes
 450 make exceptions for this.  Our decision will be guided by the two goals
 451 of preserving the free status of all derivatives of our free software and
 452 of promoting the sharing and reuse of software generally.
 453
 454 </OL>
 455
 456 <H3>NO WARRANTY</H3>
 457
 458 <OL START="11">
 459
 460 <LI>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 461 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 462 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 463 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 464 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 465 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 466 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 467 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 468 REPAIR OR CORRECTION.
 469
 470 <LI>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 471 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 472 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 473 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 474 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 475 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 476 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 477 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 478 POSSIBILITY OF SUCH DAMAGES.
 479
 480 </OL>
 481
 482 <H3>END OF TERMS AND CONDITIONS</H3>
 483
 484 <H3>How to Apply These Terms to Your New Programs</H3>
 485
 486 <P>If you develop a new program, and you want it to be of the greatest
 487 possible use to the public, the best way to achieve this is to make it
 488 free software which everyone can redistribute and change under these terms.
 489
 490 <P>To do so, attach the following notices to the program.  It is safest
 491 to attach them to the start of each source file to most effectively
 492 convey the exclusion of warranty; and each file should have at least
 493 the "copyright" line and a pointer to where the full notice is found.
 494
 495 <PRE>
 496 <VAR>one line to give the program's name and an idea of what it does.</VAR>
 497 Copyright (C) <VAR>yyyy</VAR>  <VAR>name of author</VAR>
 498
 499 This program is free software; you can redistribute it and/or
 500 modify it under the terms of the GNU General Public License
 501 as published by the Free Software Foundation; either version 2
 502 of the License, or (at your option) any later version.
 503
 504 This program is distributed in the hope that it will be useful,
 505 but WITHOUT ANY WARRANTY; without even the implied warranty of
 506 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 507 GNU General Public License for more details.
 508
 509 You should have received a copy of the GNU General Public License
 510 along with this program; if not, write to the Free Software
 511 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 512 </PRE>
 513
 514 <P>Also add information on how to contact you by electronic and paper mail.
 515
 516 <P>If the program is interactive, make it output a short notice like this
 517 when it starts in an interactive mode:
 518
 519 <PRE>
 520 Gnomovision version 69, Copyright (C) <VAR>year</VAR> <VAR>name of author</VAR>
 521 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 522 type `show w'.  This is free software, and you are welcome
 523 to redistribute it under certain conditions; type `show c'
 524 for details.
 525 </PRE>
 526
 527 <P>The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
 528 the appropriate parts of the General Public License.  Of course, the
 529 commands you use may be called something other than <SAMP>`show w'</SAMP> and
 530 <SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
 531 suits your program.
 532
 533 <P>You should also get your employer (if you work as a programmer) or your
 534 school, if any, to sign a "copyright disclaimer" for the program, if
 535 necessary.  Here is a sample; alter the names:
 536
 537 <PRE>
 538 Yoyodyne, Inc., hereby disclaims all copyright
 539 interest in the program `Gnomovision'
 540 (which makes passes at compilers) written
 541 by James Hacker.
 542
 543 <VAR>signature of Ty Coon</VAR>, 1 April 1989
 544 Ty Coon, President of Vice
 545 </PRE>
 546
 547 <H2 CLASS="title"><A NAME="LGPL">GNU LIBRARY GENERAL PUBLIC LICENSE</A></H2>
 548
 549 <P>Version 2, June 1991
 550
 551 <PRE>
 552 Copyright (C) 1991 Free Software Foundation, Inc.
 553 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 554 Everyone is permitted to copy and distribute verbatim copies
 555 of this license document, but changing it is not allowed.
 556
 557 [This is the first released version of the library GPL.  It is
 558  numbered 2 because it goes with version 2 of the ordinary GPL.]
 559 </PRE>
 560
 561 <H3>Preamble</H3>
 562
 563 <P>The licenses for most software are designed to take away your
 564 freedom to share and change it.  By contrast, the GNU General Public
 565 Licenses are intended to guarantee your freedom to share and change
 566 free software--to make sure the software is free for all its users.
 567
 568 <P>This license, the Library General Public License, applies to some
 569 specially designated Free Software Foundation software, and to any
 570 other libraries whose authors decide to use it.  You can use it for
 571 your libraries, too.
 572
 573 <P>When we speak of free software, we are referring to freedom, not
 574 price.  Our General Public Licenses are designed to make sure that you
 575 have the freedom to distribute copies of free software (and charge for
 576 this service if you wish), that you receive source code or can get it
 577 if you want it, that you can change the software or use pieces of it
 578 in new free programs; and that you know you can do these things.
 579
 580 <P>To protect your rights, we need to make restrictions that forbid
 581 anyone to deny you these rights or to ask you to surrender the rights.
 582 These restrictions translate to certain responsibilities for you if
 583 you distribute copies of the library, or if you modify it.
 584
 585 <P>For example, if you distribute copies of the library, whether gratis
 586 or for a fee, you must give the recipients all the rights that we gave
 587 you.  You must make sure that they, too, receive or can get the source
 588 code.  If you link a program with the library, you must provide
 589 complete object files to the recipients so that they can relink them
 590 with the library, after making changes to the library and recompiling
 591 it.  And you must show them these terms so they know their rights.
 592
 593 <P>Our method of protecting your rights has two steps: (1) copyright
 594 the library, and (2) offer you this license which gives you legal
 595 permission to copy, distribute and/or modify the library.
 596
 597 <P>Also, for each distributor's protection, we want to make certain
 598 that everyone understands that there is no warranty for this free
 599 library.  If the library is modified by someone else and passed on, we
 600 want its recipients to know that what they have is not the original
 601 version, so that any problems introduced by others will not reflect on
 602 the original authors' reputations.
 603
 604 <P>Finally, any free program is threatened constantly by software
 605 patents.  We wish to avoid the danger that companies distributing free
 606 software will individually obtain patent licenses, thus in effect
 607 transforming the program into proprietary software.  To prevent this,
 608 we have made it clear that any patent must be licensed for everyone's
 609 free use or not licensed at all.
 610
 611 <P>Most GNU software, including some libraries, is covered by the ordinary
 612 GNU General Public License, which was designed for utility programs.  This
 613 license, the GNU Library General Public License, applies to certain
 614 designated libraries.  This license is quite different from the ordinary
 615 one; be sure to read it in full, and don't assume that anything in it is
 616 the same as in the ordinary license.
 617
 618 <P>The reason we have a separate public license for some libraries is that
 619 they blur the distinction we usually make between modifying or adding to a
 620 program and simply using it.  Linking a program with a library, without
 621 changing the library, is in some sense simply using the library, and is
 622 analogous to running a utility program or application program.  However, in
 623 a textual and legal sense, the linked executable is a combined work, a
 624 derivative of the original library, and the ordinary General Public License
 625 treats it as such.
 626
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1061 <PRE>
1062 Yoyodyne, Inc., hereby disclaims all copyright interest in
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1065
1066 <VAR>signature of Ty Coon</VAR>, 1 April 1990
1067 Ty Coon, President of Vice
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