doc/help/license.html

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   4         <TITLE>Software License Agreement</TITLE>
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   7
   8 <P ALIGN="CENTER">Copyright 2007-2009 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>CUPS<SUP>TM</SUP> is provided under the GNU General Public License ("GPL")
  17 and GNU Library General Public License ("LGPL"), Version 2, with exceptions for
  18 Apple operating systems and the OpenSSL toolkit. A copy of the exceptions and
  19 licenses follow this introduction.</P>
  20
  21 <P>The GNU LGPL applies to the CUPS and CUPS Imaging libraries
  22 located in the "cups" and "filter" subdirectories of the CUPS
  23 source distribution and in the "cups" include directory and
  24 library files in the binary distributions. The GNU GPL applies to
  25 the remainder of the CUPS distribution, including the "pdftops"
  26 filter which is based upon Xpdf.</P>
  27
  28 <P>For those not familiar with the GNU GPL, the license basically
  29 allows you to:</P>
  30
  31 <UL>
  32
  33         <LI>Use the CUPS software at no charge.</LI>
  34
  35         <LI>Distribute verbatim copies of the software in source
  36         or binary form.</LI>
  37
  38         <LI>Sell verbatim copies of the software for a media
  39         fee, or sell support for the software.</LI>
  40
  41 </UL>
  42
  43 <P>What this license <EM>does not</EM> allow you to do is make
  44 changes or add features to CUPS and then sell a binary
  45 distribution without source code. You must provide source for any
  46 changes or additions to the software, and all code must be
  47 provided under the GPL or LGPL as appropriate. The only
  48 exceptions to this are the portions of the CUPS software covered
  49 by the Apple operating system license exceptions outlined later
  50 in this license agreement.</P>
  51
  52 <P>The GNU LGPL relaxes the "link-to" restriction, allowing you
  53 to develop applications that use the CUPS and CUPS Imaging
  54 libraries under other licenses and/or conditions as appropriate
  55 for your application, driver, or filter.</P>
  56
  57
  58 <H2 CLASS="title"><A NAME="EXCEPTIONS">License Exceptions</A></H2>
  59
  60 <P>In addition, as the copyright holder of CUPS, Apple Inc. grants
  61 the following special exceptions:</P>
  62
  63 <OL>
  64
  65         <LI><B>Apple Operating System Development License
  66         Exception</B>;
  67
  68         <OL TYPE="a">
  69
  70                 <LI>Software that is developed by any person or
  71                 entity for an Apple Operating System ("Apple
  72                 OS-Developed Software"), including but not
  73                 limited to Apple and third party printer
  74                 drivers, filters, and backends for an Apple
  75                 Operating System, that is linked to the CUPS
  76                 imaging library or based on any sample filters
  77                 or backends provided with CUPS shall not be
  78                 considered to be a derivative work or collective
  79                 work based on the CUPS program and is exempt
  80                 from the mandatory source code release clauses
  81                 of the GNU GPL. You may therefore distribute
  82                 linked combinations of the CUPS imaging library
  83                 with Apple OS-Developed Software without
  84                 releasing the source code of the Apple
  85                 OS-Developed Software. You may also use sample
  86                 filters and backends provided with CUPS to
  87                 develop Apple OS-Developed Software without
  88                 releasing the source code of the Apple
  89                 OS-Developed Software.</LI>
  90
  91                 <LI>An Apple Operating System means any
  92                 operating system software developed and/or
  93                 marketed by Apple Computer, Inc., including but
  94                 not limited to all existing releases and
  95                 versions of Apple's Darwin, Mac OS X, and Mac OS
  96                 X Server products and all follow-on releases and
  97                 future versions thereof.</LI>
  98
  99                 <LI>This exception is only available for Apple
 100                 OS-Developed Software and does not apply to
 101                 software that is distributed for use on other
 102                 operating systems.</LI>
 103
 104                 <LI>All CUPS software that falls under this
 105                 license exception have the following text at the
 106                 top of each source file:
 107
 108                 <BLOCKQUOTE>This file is subject to the Apple
 109                 OS-Developed Software
 110                 exception.</BLOCKQUOTE></LI>
 111
 112         </OL>
 113
 114         <LI><B>OpenSSL Toolkit License Exception</B>;
 115
 116         <OL TYPE="a">
 117
 118                 <LI>Apple Inc. explicitly allows the
 119                 compilation and distribution of the CUPS
 120                 software with the OpenSSL Toolkit.</LI>
 121
 122         </OL>
 123
 124 </OL>
 125
 126 <P>No developer is required to provide these exceptions in a
 127 derived work.</P>
 128
 129
 130 <H2 CLASS="title"><A NAME="KERBEROS">Kerberos Support Code</A></H2>
 131
 132 <P>The Kerberos support code ("KSC") is copyright 2006 by Jelmer
 133 Vernooij and is provided 'as-is', without any express or implied
 134 warranty. In no event will the author or Apple Inc. be held liable
 135 for any damages arising from the use of the KSC.</P>
 136
 137 <P>Sources files containing KSC have the following text at the top
 138 of each source file:</P>
 139
 140 <BLOCKQUOTE>This file contains Kerberos support code, copyright
 141 2006 by Jelmer Vernooij.</BLOCKQUOTE>
 142
 143 <P>The KSC copyright and license apply <EM>only</EM> to
 144 Kerberos-related feature code in CUPS. Such code is typically
 145 conditionally compiled based on the present of the
 146 <TT>HAVE_GSSAPI</TT> preprocessor definition.</P>
 147
 148 <P>Permission is granted to anyone to use the KSC for any
 149 purpose, including commercial applications, and to alter it and
 150 redistribute it freely, subject to the following
 151 restrictions:</P>
 152
 153 <OL>
 154
 155         <LI>The origin of the KSC must not be misrepresented; you
 156         must not claim that you wrote the original software. If
 157         you use the KSC in a product, an acknowledgment in the
 158         product documentation would be appreciated but is not
 159         required.</LI>
 160
 161         <LI>Altered source versions must be plainly marked as
 162         such, and must not be misrepresented as being the
 163         original software.</LI>
 164
 165         <LI>This notice may not be removed or altered from any
 166         source distribution.</LI>
 167
 168 </OL>
 169
 170
 171 <H2 CLASS="title"><A NAME="TRADEMARKS">Trademarks</A></H2>
 172
 173 <P>CUPS and the CUPS logo are trademarks of Apple Inc. You may use the name and
 174 logo in any direct port or binary distribution of CUPS. Please contact Apple
 175 Inc. for written permission to use them in derivative products. Our intention is
 176 to protect the value of these trademarks and ensure that any derivative product
 177 meets the same high-quality standards as the original.</P>
 178
 179
 180 <H2 CLASS="title"><A NAME="GPL">GNU GENERAL PUBLIC LICENSE</A></H2>
 181
 182 <P>Version 2, June 1991
 183
 184 <PRE>
 185 Copyright 1989, 1991 Free Software Foundation, Inc.
 186 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 187
 188 Everyone is permitted to copy and distribute verbatim
 189 copies of this license document, but changing it is not allowed.
 190 </PRE>
 191
 192 <H3>Preamble</H3>
 193
 194 <P>The licenses for most software are designed to take away your
 195 freedom to share and change it.  By contrast, the GNU General Public
 196 License is intended to guarantee your freedom to share and change free
 197 software--to make sure the software is free for all its users.  This
 198 General Public License applies to most of the Free Software
 199 Foundation's software and to any other program whose authors commit to
 200 using it.  (Some other Free Software Foundation software is covered by
 201 the GNU Library General Public License instead.)  You can apply it to
 202 your programs, too.
 203
 204 <P>When we speak of free software, we are referring to freedom, not
 205 price.  Our General Public Licenses are designed to make sure that you
 206 have the freedom to distribute copies of free software (and charge for
 207 this service if you wish), that you receive source code or can get it
 208 if you want it, that you can change the software or use pieces of it
 209 in new free programs; and that you know you can do these things.
 210
 211 <P>To protect your rights, we need to make restrictions that forbid
 212 anyone to deny you these rights or to ask you to surrender the rights.
 213 These restrictions translate to certain responsibilities for you if you
 214 distribute copies of the software, or if you modify it.
 215
 216 <P>For example, if you distribute copies of such a program, whether
 217 gratis or for a fee, you must give the recipients all the rights that
 218 you have.  You must make sure that they, too, receive or can get the
 219 source code.  And you must show them these terms so they know their
 220 rights.
 221
 222 <P>We protect your rights with two steps: (1) copyright the software, and
 223 (2) offer you this license which gives you legal permission to copy,
 224 distribute and/or modify the software.
 225
 226 <P>Also, for each author's protection and ours, we want to make certain
 227 that everyone understands that there is no warranty for this free
 228 software.  If the software is modified by someone else and passed on, we
 229 want its recipients to know that what they have is not the original, so
 230 that any problems introduced by others will not reflect on the original
 231 authors' reputations.
 232
 233 <P>Finally, any free program is threatened constantly by software
 234 patents.  We wish to avoid the danger that redistributors of a free
 235 program will individually obtain patent licenses, in effect making the
 236 program proprietary.  To prevent this, we have made it clear that any
 237 patent must be licensed for everyone's free use or not licensed at all.
 238
 239 <P>The precise terms and conditions for copying, distribution and
 240 modification follow.
 241
 242 <H3>GNU GENERAL PUBLIC LICENSE<BR>
 243 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>
 244
 245 <OL START="0">
 246
 247 <LI>This License applies to any program or other work which contains
 248 a notice placed by the copyright holder saying it may be distributed
 249 under the terms of this General Public License.  The "Program", below,
 250 refers to any such program or work, and a "work based on the Program"
 251 means either the Program or any derivative work under copyright law:
 252 that is to say, a work containing the Program or a portion of it,
 253 either verbatim or with modifications and/or translated into another
 254 language.  (Hereinafter, translation is included without limitation in
 255 the term "modification".)  Each licensee is addressed as "you".
 256
 257 <P>Activities other than copying, distribution and modification are not
 258 covered by this License; they are outside its scope.  The act of
 259 running the Program is not restricted, and the output from the Program
 260 is covered only if its contents constitute a work based on the
 261 Program (independent of having been made by running the Program).
 262 Whether that is true depends on what the Program does.
 263
 264 <LI>You may copy and distribute verbatim copies of the Program's
 265 source code as you receive it, in any medium, provided that you
 266 conspicuously and appropriately publish on each copy an appropriate
 267 copyright notice and disclaimer of warranty; keep intact all the
 268 notices that refer to this License and to the absence of any warranty;
 269 and give any other recipients of the Program a copy of this License
 270 along with the Program.
 271
 272 <P>You may charge a fee for the physical act of transferring a copy, and
 273 you may at your option offer warranty protection in exchange for a fee.
 274
 275 <LI>You may modify your copy or copies of the Program or any portion
 276 of it, thus forming a work based on the Program, and copy and
 277 distribute such modifications or work under the terms of Section 1
 278 above, provided that you also meet all of these conditions:
 279
 280 <OL TYPE="a">
 281
 282 <LI>You must cause the modified files to carry prominent notices
 283 stating that you changed the files and the date of any change.
 284
 285 <LI>You must cause any work that you distribute or publish, that in
 286 whole or in part contains or is derived from the Program or any
 287 part thereof, to be licensed as a whole at no charge to all third
 288 parties under the terms of this License.
 289
 290 <LI>if the modified program normally reads commands interactively
 291 when run, you must cause it, when started running for such
 292 interactive use in the most ordinary way, to print or display an
 293 announcement including an appropriate copyright notice and a
 294 notice that there is no warranty (or else, saying that you provide
 295 a warranty) and that users may redistribute the program under
 296 these conditions, and telling the user how to view a copy of this
 297 License.  (Exception: if the Program itself is interactive but
 298 does not normally print such an announcement, your work based on
 299 the Program is not required to print an announcement.)
 300
 301 </OL>
 302
 303 <P>These requirements apply to the modified work as a whole.  If
 304 identifiable sections of that work are not derived from the Program,
 305 and can be reasonably considered independent and separate works in
 306 themselves, then this License, and its terms, do not apply to those
 307 sections when you distribute them as separate works.  But when you
 308 distribute the same sections as part of a whole which is a work based
 309 on the Program, the distribution of the whole must be on the terms of
 310 this License, whose permissions for other licensees extend to the
 311 entire whole, and thus to each and every part regardless of who wrote it.
 312
 313 <P>Thus, it is not the intent of this section to claim rights or contest
 314 your rights to work written entirely by you; rather, the intent is to
 315 exercise the right to control the distribution of derivative or
 316 collective works based on the Program.
 317
 318 <P>In addition, mere aggregation of another work not based on the Program
 319 with the Program (or with a work based on the Program) on a volume of
 320 a storage or distribution medium does not bring the other work under
 321 the scope of this License.
 322
 323 <LI>You may copy and distribute the Program (or a work based on it,
 324 under Section 2) in object code or executable form under the terms of
 325 Sections 1 and 2 above provided that you also do one of the following:
 326
 327 <OL TYPE="a">
 328
 329 <LI>Accompany it with the complete corresponding machine-readable
 330 source code, which must be distributed under the terms of Sections
 331 1 and 2 above on a medium customarily used for software interchange; or,
 332
 333 <LI>Accompany it with a written offer, valid for at least three
 334 years, to give any third party, for a charge no more than your
 335 cost of physically performing source distribution, a complete
 336 machine-readable copy of the corresponding source code, to be
 337 distributed under the terms of Sections 1 and 2 above on a medium
 338 customarily used for software interchange; or,
 339
 340 <LI>Accompany it with the information you received as to the offer
 341 to distribute corresponding source code.  (This alternative is
 342 allowed only for noncommercial distribution and only if you
 343 received the program in object code or executable form with such
 344 an offer, in accord with Subsection b above.)
 345
 346 </OL>
 347
 348 <P>The source code for a work means the preferred form of the work for
 349 making modifications to it.  For an executable work, complete source
 350 code means all the source code for all modules it contains, plus any
 351 associated interface definition files, plus the scripts used to
 352 control compilation and installation of the executable.  However, as a
 353 special exception, the source code distributed need not include
 354 anything that is normally distributed (in either source or binary
 355 form) with the major components (compiler, kernel, and so on) of the
 356 operating system on which the executable runs, unless that component
 357 itself accompanies the executable.
 358
 359 <P>If distribution of executable or object code is made by offering
 360 access to copy from a designated place, then offering equivalent
 361 access to copy the source code from the same place counts as
 362 distribution of the source code, even though third parties are not
 363 compelled to copy the source along with the object code.
 364
 365 <LI>You may not copy, modify, sublicense, or distribute the Program
 366 except as expressly provided under this License.  Any attempt
 367 otherwise to copy, modify, sublicense or distribute the Program is
 368 void, and will automatically terminate your rights under this License.
 369 However, parties who have received copies, or rights, from you under
 370 this License will not have their licenses terminated so long as such
 371 parties remain in full compliance.
 372
 373 <LI>You are not required to accept this License, since you have not
 374 signed it.  However, nothing else grants you permission to modify or
 375 distribute the Program or its derivative works.  These actions are
 376 prohibited by law if you do not accept this License.  Therefore, by
 377 modifying or distributing the Program (or any work based on the
 378 Program), you indicate your acceptance of this License to do so, and
 379 all its terms and conditions for copying, distributing or modifying
 380 the Program or works based on it.
 381
 382 <LI>Each time you redistribute the Program (or any work based on the
 383 Program), the recipient automatically receives a license from the
 384 original licensor to copy, distribute or modify the Program subject to
 385 these terms and conditions.  You may not impose any further
 386 restrictions on the recipients' exercise of the rights granted herein.
 387 You are not responsible for enforcing compliance by third parties to
 388 this License.
 389
 390 <LI>If, as a consequence of a court judgment or allegation of patent
 391 infringement or for any other reason (not limited to patent issues),
 392 conditions are imposed on you (whether by court order, agreement or
 393 otherwise) that contradict the conditions of this License, they do not
 394 excuse you from the conditions of this License.  If you cannot
 395 distribute so as to satisfy simultaneously your obligations under this
 396 License and any other pertinent obligations, then as a consequence you
 397 may not distribute the Program at all.  For example, if a patent
 398 license would not permit royalty-free redistribution of the Program by
 399 all those who receive copies directly or indirectly through you, then
 400 the only way you could satisfy both it and this License would be to
 401 refrain entirely from distribution of the Program.
 402
 403 <P>If any portion of this section is held invalid or unenforceable under
 404 any particular circumstance, the balance of the section is intended to
 405 apply and the section as a whole is intended to apply in other
 406 circumstances.
 407
 408 <P>It is not the purpose of this section to induce you to infringe any
 409 patents or other property right claims or to contest validity of any
 410 such claims; this section has the sole purpose of protecting the
 411 integrity of the free software distribution system, which is
 412 implemented by public license practices.  Many people have made
 413 generous contributions to the wide range of software distributed
 414 through that system in reliance on consistent application of that
 415 system; it is up to the author/donor to decide if he or she is willing
 416 to distribute software through any other system and a licensee cannot
 417 impose that choice.
 418
 419 <P>This section is intended to make thoroughly clear what is believed to
 420 be a consequence of the rest of this License.
 421
 422 <LI>If the distribution and/or use of the Program is restricted in
 423 certain countries either by patents or by copyrighted interfaces, the
 424 original copyright holder who places the Program under this License
 425 may add an explicit geographical distribution limitation excluding
 426 those countries, so that distribution is permitted only in or among
 427 countries not thus excluded.  In such case, this License incorporates
 428 the limitation as if written in the body of this License.
 429
 430 <LI>The Free Software Foundation may publish revised and/or new versions
 431 of the General Public License from time to time.  Such new versions will
 432 be similar in spirit to the present version, but may differ in detail to
 433 address new problems or concerns.
 434
 435 <P>Each version is given a distinguishing version number.  If the Program
 436 specifies a version number of this License which applies to it and "any
 437 later version", you have the option of following the terms and conditions
 438 either of that version or of any later version published by the Free
 439 Software Foundation.  If the Program does not specify a version number of
 440 this License, you may choose any version ever published by the Free Software
 441 Foundation.
 442
 443 <LI>If you wish to incorporate parts of the Program into other free
 444 programs whose distribution conditions are different, write to the author
 445 to ask for permission.  For software which is copyrighted by the Free
 446 Software Foundation, write to the Free Software Foundation; we sometimes
 447 make exceptions for this.  Our decision will be guided by the two goals
 448 of preserving the free status of all derivatives of our free software and
 449 of promoting the sharing and reuse of software generally.
 450
 451 </OL>
 452
 453 <H3>NO WARRANTY</H3>
 454
 455 <OL START="11">
 456
 457 <LI>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 458 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 459 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 460 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 461 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 462 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 463 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 464 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 465 REPAIR OR CORRECTION.
 466
 467 <LI>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 468 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 469 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 470 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 471 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 472 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 473 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 474 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 475 POSSIBILITY OF SUCH DAMAGES.
 476
 477 </OL>
 478
 479 <H3>END OF TERMS AND CONDITIONS</H3>
 480
 481 <H3>How to Apply These Terms to Your New Programs</H3>
 482
 483 <P>If you develop a new program, and you want it to be of the greatest
 484 possible use to the public, the best way to achieve this is to make it
 485 free software which everyone can redistribute and change under these terms.
 486
 487 <P>To do so, attach the following notices to the program.  It is safest
 488 to attach them to the start of each source file to most effectively
 489 convey the exclusion of warranty; and each file should have at least
 490 the "copyright" line and a pointer to where the full notice is found.
 491
 492 <PRE>
 493 <VAR>one line to give the program's name and an idea of what it does.</VAR>
 494 Copyright (C) <VAR>yyyy</VAR>  <VAR>name of author</VAR>
 495
 496 This program is free software; you can redistribute it and/or
 497 modify it under the terms of the GNU General Public License
 498 as published by the Free Software Foundation; either version 2
 499 of the License, or (at your option) any later version.
 500
 501 This program is distributed in the hope that it will be useful,
 502 but WITHOUT ANY WARRANTY; without even the implied warranty of
 503 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 504 GNU General Public License for more details.
 505
 506 You should have received a copy of the GNU General Public License
 507 along with this program; if not, write to the Free Software
 508 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 509 </PRE>
 510
 511 <P>Also add information on how to contact you by electronic and paper mail.
 512
 513 <P>If the program is interactive, make it output a short notice like this
 514 when it starts in an interactive mode:
 515
 516 <PRE>
 517 Gnomovision version 69, Copyright (C) <VAR>year</VAR> <VAR>name of author</VAR>
 518 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 519 type `show w'.  This is free software, and you are welcome
 520 to redistribute it under certain conditions; type `show c'
 521 for details.
 522 </PRE>
 523
 524 <P>The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
 525 the appropriate parts of the General Public License.  Of course, the
 526 commands you use may be called something other than <SAMP>`show w'</SAMP> and
 527 <SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
 528 suits your program.
 529
 530 <P>You should also get your employer (if you work as a programmer) or your
 531 school, if any, to sign a "copyright disclaimer" for the program, if
 532 necessary.  Here is a sample; alter the names:
 533
 534 <PRE>
 535 Yoyodyne, Inc., hereby disclaims all copyright
 536 interest in the program `Gnomovision'
 537 (which makes passes at compilers) written
 538 by James Hacker.
 539
 540 <VAR>signature of Ty Coon</VAR>, 1 April 1989
 541 Ty Coon, President of Vice
 542 </PRE>
 543
 544 <H2 CLASS="title"><A NAME="LGPL">GNU LIBRARY GENERAL PUBLIC LICENSE</A></H2>
 545
 546 <P>Version 2, June 1991
 547
 548 <PRE>
 549 Copyright (C) 1991 Free Software Foundation, Inc.
 550 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 551 Everyone is permitted to copy and distribute verbatim copies
 552 of this license document, but changing it is not allowed.
 553
 554 [This is the first released version of the library GPL.  It is
 555  numbered 2 because it goes with version 2 of the ordinary GPL.]
 556 </PRE>
 557
 558 <H3>Preamble</H3>
 559
 560 <P>The licenses for most software are designed to take away your
 561 freedom to share and change it.  By contrast, the GNU General Public
 562 Licenses are intended to guarantee your freedom to share and change
 563 free software--to make sure the software is free for all its users.
 564
 565 <P>This license, the Library General Public License, applies to some
 566 specially designated Free Software Foundation software, and to any
 567 other libraries whose authors decide to use it.  You can use it for
 568 your libraries, too.
 569
 570 <P>When we speak of free software, we are referring to freedom, not
 571 price.  Our General Public Licenses are designed to make sure that you
 572 have the freedom to distribute copies of free software (and charge for
 573 this service if you wish), that you receive source code or can get it
 574 if you want it, that you can change the software or use pieces of it
 575 in new free programs; and that you know you can do these things.
 576
 577 <P>To protect your rights, we need to make restrictions that forbid
 578 anyone to deny you these rights or to ask you to surrender the rights.
 579 These restrictions translate to certain responsibilities for you if
 580 you distribute copies of the library, or if you modify it.
 581
 582 <P>For example, if you distribute copies of the library, whether gratis
 583 or for a fee, you must give the recipients all the rights that we gave
 584 you.  You must make sure that they, too, receive or can get the source
 585 code.  If you link a program with the library, you must provide
 586 complete object files to the recipients so that they can relink them
 587 with the library, after making changes to the library and recompiling
 588 it.  And you must show them these terms so they know their rights.
 589
 590 <P>Our method of protecting your rights has two steps: (1) copyright
 591 the library, and (2) offer you this license which gives you legal
 592 permission to copy, distribute and/or modify the library.
 593
 594 <P>Also, for each distributor's protection, we want to make certain
 595 that everyone understands that there is no warranty for this free
 596 library.  If the library is modified by someone else and passed on, we
 597 want its recipients to know that what they have is not the original
 598 version, so that any problems introduced by others will not reflect on
 599 the original authors' reputations.
 600
 601 <P>Finally, any free program is threatened constantly by software
 602 patents.  We wish to avoid the danger that companies distributing free
 603 software will individually obtain patent licenses, thus in effect
 604 transforming the program into proprietary software.  To prevent this,
 605 we have made it clear that any patent must be licensed for everyone's
 606 free use or not licensed at all.
 607
 608 <P>Most GNU software, including some libraries, is covered by the ordinary
 609 GNU General Public License, which was designed for utility programs.  This
 610 license, the GNU Library General Public License, applies to certain
 611 designated libraries.  This license is quite different from the ordinary
 612 one; be sure to read it in full, and don't assume that anything in it is
 613 the same as in the ordinary license.
 614
 615 <P>The reason we have a separate public license for some libraries is that
 616 they blur the distinction we usually make between modifying or adding to a
 617 program and simply using it.  Linking a program with a library, without
 618 changing the library, is in some sense simply using the library, and is
 619 analogous to running a utility program or application program.  However, in
 620 a textual and legal sense, the linked executable is a combined work, a
 621 derivative of the original library, and the ordinary General Public License
 622 treats it as such.
 623
 624 <P>Because of this blurred distinction, using the ordinary General
 625 Public License for libraries did not effectively promote software
 626 sharing, because most developers did not use the libraries.  We
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1020 <H3>How to Apply These Terms to Your New Libraries</H3>
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1058 <PRE>
1059 Yoyodyne, Inc., hereby disclaims all copyright interest in
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1062
1063 <VAR>signature of Ty Coon</VAR>, 1 April 1990
1064 Ty Coon, President of Vice
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