doc/help/license.html

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   4         <TITLE>Software License Agreement</TITLE>
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   7
   8 <P ALIGN="CENTER">Copyright 1997-2007 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 and CUPS Imaging libraries
  26 located in the "cups" and "filter" subdirectories of the CUPS
  27 source distribution and in the "cups" include directory and
  28 library files in the binary distributions. The GNU GPL applies to
  29 the remainder of the CUPS distribution, including the "pdftops"
  30 filter which is based upon Xpdf.</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 </UL>
  46
  47 <P>What this license <EM>does not</EM> allow you to do is make
  48 changes or add features to CUPS and then sell a binary
  49 distribution without source code. You must provide source for any
  50 changes or additions to the software, and all code must be
  51 provided under the GPL or LGPL as appropriate. The only
  52 exceptions to this are the portions of the CUPS software covered
  53 by the Apple operating system license exceptions outlined later
  54 in this license agreement.</P>
  55
  56 <P>The GNU LGPL relaxes the "link-to" restriction, allowing you
  57 to develop applications that use the CUPS and CUPS Imaging
  58 libraries under other licenses and/or conditions as appropriate
  59 for your application, driver, or filter.</P>
  60
  61
  62 <H2 CLASS="title"><A NAME="EXCEPTIONS">License Exceptions</A></H2>
  63
  64 <P>In addition, as the copyright holder of CUPS, Easy Software
  65 Products grants the following special exceptions:</P>
  66
  67 <OL>
  68
  69         <LI><B>Apple Operating System Development License
  70         Exception</B>;
  71
  72         <OL TYPE="a">
  73
  74                 <LI>Software that is developed by any person or
  75                 entity for an Apple Operating System ("Apple
  76                 OS-Developed Software"), including but not
  77                 limited to Apple and third party printer
  78                 drivers, filters, and backends for an Apple
  79                 Operating System, that is linked to the CUPS
  80                 imaging library or based on any sample filters
  81                 or backends provided with CUPS shall not be
  82                 considered to be a derivative work or collective
  83                 work based on the CUPS program and is exempt
  84                 from the mandatory source code release clauses
  85                 of the GNU GPL. You may therefore distribute
  86                 linked combinations of the CUPS imaging library
  87                 with Apple OS-Developed Software without
  88                 releasing the source code of the Apple
  89                 OS-Developed Software. You may also use sample
  90                 filters and backends provided with CUPS to
  91                 develop Apple OS-Developed Software without
  92                 releasing the source code of the Apple
  93                 OS-Developed Software.</LI>
  94
  95                 <LI>An Apple Operating System means any
  96                 operating system software developed and/or
  97                 marketed by Apple Computer, Inc., including but
  98                 not limited to all existing releases and
  99                 versions of Apple's Darwin, Mac OS X, and Mac OS
 100                 X Server products and all follow-on releases and
 101                 future versions thereof.</LI>
 102
 103                 <LI>This exception is only available for Apple
 104                 OS-Developed Software and does not apply to
 105                 software that is distributed for use on other
 106                 operating systems.</LI>
 107
 108                 <LI>All CUPS software that falls under this
 109                 license exception have the following text at the
 110                 top of each source file:
 111
 112                 <BLOCKQUOTE>This file is subject to the Apple
 113                 OS-Developed Software
 114                 exception.</BLOCKQUOTE></LI>
 115
 116         </OL>
 117
 118         <LI><B>OpenSSL Toolkit License Exception</B>;
 119
 120         <OL TYPE="a">
 121
 122                 <LI>Easy Software Products explicitly allows the
 123                 compilation and distribution of the CUPS
 124                 software with the OpenSSL Toolkit.</LI>
 125
 126         </OL>
 127
 128 </OL>
 129
 130 <P>No developer is required to provide these exceptions in a
 131 derived work.</P>
 132
 133
 134 <H2 CLASS="title"><A NAME="TRADEMARKS">Trademarks</A></H2>
 135
 136 <P>Easy Software Products has trademarked the Common UNIX
 137 Printing System, CUPS, and CUPS logo. You may use these names and
 138 logos in any direct port or binary distribution of CUPS. Please
 139 contact Easy Software Products for written permission to use them
 140 in derivative products. Our intention is to protect the value of
 141 these trademarks and ensure that any derivative product meets the
 142 same high-quality standards as the original.</P>
 143
 144
 145 <H2 CLASS="title"><A NAME="BINARY">Binary Distribution Rights</A></H2>
 146
 147 <P>Easy Software Products also sells rights to the CUPS source
 148 code under a binary distribution license for vendors that are
 149 unable to release source code for their additions and
 150 modifications to CUPS under the GNU GPL and LGPL. For information
 151 please contact us at the address shown above.</P>
 152
 153 <P>The Common UNIX Printing System provides a "pdftops" filter
 154 that is based on the Xpdf software. For binary distribution
 155 licensing of this software, please contact:</P>
 156
 157 <BLOCKQUOTE>
 158 Derek B. Noonburg<BR>
 159 Email: <A HREF="mailto:derekn@glyphandcog.com">derekn@glyphandcog.com</A><BR>
 160 WWW: <A HREF="http://www.glyphandcog.com/">http://www.glyphandcog.com/</A>
 161 </BLOCKQUOTE>
 162
 163
 164 <H2 CLASS="title"><A NAME="SUPPORT">Support</A></H2>
 165
 166 <P>Easy Software Products sells software support for CUPS as well
 167 as a commercial printing product based on CUPS called ESP Print
 168 Pro. You can find out more at our web site:</P>
 169
 170 <UL><PRE>
 171 <A HREF="http://www.easysw.com/">http://www.easysw.com/</A>
 172 </PRE></UL>
 173
 174
 175 <H2 CLASS="title"><A NAME="GPL">GNU GENERAL PUBLIC LICENSE</A></H2>
 176
 177 <P>Version 2, June 1991
 178
 179 <PRE>
 180 Copyright 1989, 1991 Free Software Foundation, Inc.
 181 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 182
 183 Everyone is permitted to copy and distribute verbatim
 184 copies of this license document, but changing it is not allowed.
 185 </PRE>
 186
 187 <H3>Preamble</H3>
 188
 189 <P>The licenses for most software are designed to take away your
 190 freedom to share and change it.  By contrast, the GNU General Public
 191 License is intended to guarantee your freedom to share and change free
 192 software--to make sure the software is free for all its users.  This
 193 General Public License applies to most of the Free Software
 194 Foundation's software and to any other program whose authors commit to
 195 using it.  (Some other Free Software Foundation software is covered by
 196 the GNU Library General Public License instead.)  You can apply it to
 197 your programs, too.
 198
 199 <P>When we speak of free software, we are referring to freedom, not
 200 price.  Our General Public Licenses are designed to make sure that you
 201 have the freedom to distribute copies of free software (and charge for
 202 this service if you wish), that you receive source code or can get it
 203 if you want it, that you can change the software or use pieces of it
 204 in new free programs; and that you know you can do these things.
 205
 206 <P>To protect your rights, we need to make restrictions that forbid
 207 anyone to deny you these rights or to ask you to surrender the rights.
 208 These restrictions translate to certain responsibilities for you if you
 209 distribute copies of the software, or if you modify it.
 210
 211 <P>For example, if you distribute copies of such a program, whether
 212 gratis or for a fee, you must give the recipients all the rights that
 213 you have.  You must make sure that they, too, receive or can get the
 214 source code.  And you must show them these terms so they know their
 215 rights.
 216
 217 <P>We protect your rights with two steps: (1) copyright the software, and
 218 (2) offer you this license which gives you legal permission to copy,
 219 distribute and/or modify the software.
 220
 221 <P>Also, for each author's protection and ours, we want to make certain
 222 that everyone understands that there is no warranty for this free
 223 software.  If the software is modified by someone else and passed on, we
 224 want its recipients to know that what they have is not the original, so
 225 that any problems introduced by others will not reflect on the original
 226 authors' reputations.
 227
 228 <P>Finally, any free program is threatened constantly by software
 229 patents.  We wish to avoid the danger that redistributors of a free
 230 program will individually obtain patent licenses, in effect making the
 231 program proprietary.  To prevent this, we have made it clear that any
 232 patent must be licensed for everyone's free use or not licensed at all.
 233
 234 <P>The precise terms and conditions for copying, distribution and
 235 modification follow.
 236
 237 <H3>GNU GENERAL PUBLIC LICENSE<BR>
 238 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H3>
 239
 240 <OL START="0">
 241
 242 <LI>This License applies to any program or other work which contains
 243 a notice placed by the copyright holder saying it may be distributed
 244 under the terms of this General Public License.  The "Program", below,
 245 refers to any such program or work, and a "work based on the Program"
 246 means either the Program or any derivative work under copyright law:
 247 that is to say, a work containing the Program or a portion of it,
 248 either verbatim or with modifications and/or translated into another
 249 language.  (Hereinafter, translation is included without limitation in
 250 the term "modification".)  Each licensee is addressed as "you".
 251
 252 <P>Activities other than copying, distribution and modification are not
 253 covered by this License; they are outside its scope.  The act of
 254 running the Program is not restricted, and the output from the Program
 255 is covered only if its contents constitute a work based on the
 256 Program (independent of having been made by running the Program).
 257 Whether that is true depends on what the Program does.
 258
 259 <LI>You may copy and distribute verbatim copies of the Program's
 260 source code as you receive it, in any medium, provided that you
 261 conspicuously and appropriately publish on each copy an appropriate
 262 copyright notice and disclaimer of warranty; keep intact all the
 263 notices that refer to this License and to the absence of any warranty;
 264 and give any other recipients of the Program a copy of this License
 265 along with the Program.
 266
 267 <P>You may charge a fee for the physical act of transferring a copy, and
 268 you may at your option offer warranty protection in exchange for a fee.
 269
 270 <LI>You may modify your copy or copies of the Program or any portion
 271 of it, thus forming a work based on the Program, and copy and
 272 distribute such modifications or work under the terms of Section 1
 273 above, provided that you also meet all of these conditions:
 274
 275 <OL TYPE="a">
 276
 277 <LI>You must cause the modified files to carry prominent notices
 278 stating that you changed the files and the date of any change.
 279
 280 <LI>You must cause any work that you distribute or publish, that in
 281 whole or in part contains or is derived from the Program or any
 282 part thereof, to be licensed as a whole at no charge to all third
 283 parties under the terms of this License.
 284
 285 <LI>if the modified program normally reads commands interactively
 286 when run, you must cause it, when started running for such
 287 interactive use in the most ordinary way, to print or display an
 288 announcement including an appropriate copyright notice and a
 289 notice that there is no warranty (or else, saying that you provide
 290 a warranty) and that users may redistribute the program under
 291 these conditions, and telling the user how to view a copy of this
 292 License.  (Exception: if the Program itself is interactive but
 293 does not normally print such an announcement, your work based on
 294 the Program is not required to print an announcement.)
 295
 296 </OL>
 297
 298 <P>These requirements apply to the modified work as a whole.  If
 299 identifiable sections of that work are not derived from the Program,
 300 and can be reasonably considered independent and separate works in
 301 themselves, then this License, and its terms, do not apply to those
 302 sections when you distribute them as separate works.  But when you
 303 distribute the same sections as part of a whole which is a work based
 304 on the Program, the distribution of the whole must be on the terms of
 305 this License, whose permissions for other licensees extend to the
 306 entire whole, and thus to each and every part regardless of who wrote it.
 307
 308 <P>Thus, it is not the intent of this section to claim rights or contest
 309 your rights to work written entirely by you; rather, the intent is to
 310 exercise the right to control the distribution of derivative or
 311 collective works based on the Program.
 312
 313 <P>In addition, mere aggregation of another work not based on the Program
 314 with the Program (or with a work based on the Program) on a volume of
 315 a storage or distribution medium does not bring the other work under
 316 the scope of this License.
 317
 318 <LI>You may copy and distribute the Program (or a work based on it,
 319 under Section 2) in object code or executable form under the terms of
 320 Sections 1 and 2 above provided that you also do one of the following:
 321
 322 <OL TYPE="a">
 323
 324 <LI>Accompany it with the complete corresponding machine-readable
 325 source code, which must be distributed under the terms of Sections
 326 1 and 2 above on a medium customarily used for software interchange; or,
 327
 328 <LI>Accompany it with a written offer, valid for at least three
 329 years, to give any third party, for a charge no more than your
 330 cost of physically performing source distribution, a complete
 331 machine-readable copy of the corresponding source code, to be
 332 distributed under the terms of Sections 1 and 2 above on a medium
 333 customarily used for software interchange; or,
 334
 335 <LI>Accompany it with the information you received as to the offer
 336 to distribute corresponding source code.  (This alternative is
 337 allowed only for noncommercial distribution and only if you
 338 received the program in object code or executable form with such
 339 an offer, in accord with Subsection b above.)
 340
 341 </OL>
 342
 343 <P>The source code for a work means the preferred form of the work for
 344 making modifications to it.  For an executable work, complete source
 345 code means all the source code for all modules it contains, plus any
 346 associated interface definition files, plus the scripts used to
 347 control compilation and installation of the executable.  However, as a
 348 special exception, the source code distributed need not include
 349 anything that is normally distributed (in either source or binary
 350 form) with the major components (compiler, kernel, and so on) of the
 351 operating system on which the executable runs, unless that component
 352 itself accompanies the executable.
 353
 354 <P>If distribution of executable or object code is made by offering
 355 access to copy from a designated place, then offering equivalent
 356 access to copy the source code from the same place counts as
 357 distribution of the source code, even though third parties are not
 358 compelled to copy the source along with the object code.
 359
 360 <LI>You may not copy, modify, sublicense, or distribute the Program
 361 except as expressly provided under this License.  Any attempt
 362 otherwise to copy, modify, sublicense or distribute the Program is
 363 void, and will automatically terminate your rights under this License.
 364 However, parties who have received copies, or rights, from you under
 365 this License will not have their licenses terminated so long as such
 366 parties remain in full compliance.
 367
 368 <LI>You are not required to accept this License, since you have not
 369 signed it.  However, nothing else grants you permission to modify or
 370 distribute the Program or its derivative works.  These actions are
 371 prohibited by law if you do not accept this License.  Therefore, by
 372 modifying or distributing the Program (or any work based on the
 373 Program), you indicate your acceptance of this License to do so, and
 374 all its terms and conditions for copying, distributing or modifying
 375 the Program or works based on it.
 376
 377 <LI>Each time you redistribute the Program (or any work based on the
 378 Program), the recipient automatically receives a license from the
 379 original licensor to copy, distribute or modify the Program subject to
 380 these terms and conditions.  You may not impose any further
 381 restrictions on the recipients' exercise of the rights granted herein.
 382 You are not responsible for enforcing compliance by third parties to
 383 this License.
 384
 385 <LI>If, as a consequence of a court judgment or allegation of patent
 386 infringement or for any other reason (not limited to patent issues),
 387 conditions are imposed on you (whether by court order, agreement or
 388 otherwise) that contradict the conditions of this License, they do not
 389 excuse you from the conditions of this License.  If you cannot
 390 distribute so as to satisfy simultaneously your obligations under this
 391 License and any other pertinent obligations, then as a consequence you
 392 may not distribute the Program at all.  For example, if a patent
 393 license would not permit royalty-free redistribution of the Program by
 394 all those who receive copies directly or indirectly through you, then
 395 the only way you could satisfy both it and this License would be to
 396 refrain entirely from distribution of the Program.
 397
 398 <P>If any portion of this section is held invalid or unenforceable under
 399 any particular circumstance, the balance of the section is intended to
 400 apply and the section as a whole is intended to apply in other
 401 circumstances.
 402
 403 <P>It is not the purpose of this section to induce you to infringe any
 404 patents or other property right claims or to contest validity of any
 405 such claims; this section has the sole purpose of protecting the
 406 integrity of the free software distribution system, which is
 407 implemented by public license practices.  Many people have made
 408 generous contributions to the wide range of software distributed
 409 through that system in reliance on consistent application of that
 410 system; it is up to the author/donor to decide if he or she is willing
 411 to distribute software through any other system and a licensee cannot
 412 impose that choice.
 413
 414 <P>This section is intended to make thoroughly clear what is believed to
 415 be a consequence of the rest of this License.
 416
 417 <LI>If the distribution and/or use of the Program is restricted in
 418 certain countries either by patents or by copyrighted interfaces, the
 419 original copyright holder who places the Program under this License
 420 may add an explicit geographical distribution limitation excluding
 421 those countries, so that distribution is permitted only in or among
 422 countries not thus excluded.  In such case, this License incorporates
 423 the limitation as if written in the body of this License.
 424
 425 <LI>The Free Software Foundation may publish revised and/or new versions
 426 of the General Public License from time to time.  Such new versions will
 427 be similar in spirit to the present version, but may differ in detail to
 428 address new problems or concerns.
 429
 430 <P>Each version is given a distinguishing version number.  If the Program
 431 specifies a version number of this License which applies to it and "any
 432 later version", you have the option of following the terms and conditions
 433 either of that version or of any later version published by the Free
 434 Software Foundation.  If the Program does not specify a version number of
 435 this License, you may choose any version ever published by the Free Software
 436 Foundation.
 437
 438 <LI>If you wish to incorporate parts of the Program into other free
 439 programs whose distribution conditions are different, write to the author
 440 to ask for permission.  For software which is copyrighted by the Free
 441 Software Foundation, write to the Free Software Foundation; we sometimes
 442 make exceptions for this.  Our decision will be guided by the two goals
 443 of preserving the free status of all derivatives of our free software and
 444 of promoting the sharing and reuse of software generally.
 445
 446 </OL>
 447
 448 <H3>NO WARRANTY</H3>
 449
 450 <OL START="11">
 451
 452 <LI>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
 453 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
 454 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
 455 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
 456 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 457 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
 458 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
 459 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
 460 REPAIR OR CORRECTION.
 461
 462 <LI>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 463 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
 464 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 465 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
 466 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
 467 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
 468 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
 469 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 470 POSSIBILITY OF SUCH DAMAGES.
 471
 472 </OL>
 473
 474 <H3>END OF TERMS AND CONDITIONS</H3>
 475
 476 <H3>How to Apply These Terms to Your New Programs</H3>
 477
 478 <P>If you develop a new program, and you want it to be of the greatest
 479 possible use to the public, the best way to achieve this is to make it
 480 free software which everyone can redistribute and change under these terms.
 481
 482 <P>To do so, attach the following notices to the program.  It is safest
 483 to attach them to the start of each source file to most effectively
 484 convey the exclusion of warranty; and each file should have at least
 485 the "copyright" line and a pointer to where the full notice is found.
 486
 487 <PRE>
 488 <VAR>one line to give the program's name and an idea of what it does.</VAR>
 489 Copyright (C) <VAR>yyyy</VAR>  <VAR>name of author</VAR>
 490
 491 This program is free software; you can redistribute it and/or
 492 modify it under the terms of the GNU General Public License
 493 as published by the Free Software Foundation; either version 2
 494 of the License, or (at your option) any later version.
 495
 496 This program is distributed in the hope that it will be useful,
 497 but WITHOUT ANY WARRANTY; without even the implied warranty of
 498 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 499 GNU General Public License for more details.
 500
 501 You should have received a copy of the GNU General Public License
 502 along with this program; if not, write to the Free Software
 503 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 504 </PRE>
 505
 506 <P>Also add information on how to contact you by electronic and paper mail.
 507
 508 <P>If the program is interactive, make it output a short notice like this
 509 when it starts in an interactive mode:
 510
 511 <PRE>
 512 Gnomovision version 69, Copyright (C) <VAR>year</VAR> <VAR>name of author</VAR>
 513 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
 514 type `show w'.  This is free software, and you are welcome
 515 to redistribute it under certain conditions; type `show c'
 516 for details.
 517 </PRE>
 518
 519 <P>The hypothetical commands <SAMP>`show w'</SAMP> and <SAMP>`show c'</SAMP> should show
 520 the appropriate parts of the General Public License.  Of course, the
 521 commands you use may be called something other than <SAMP>`show w'</SAMP> and
 522 <SAMP>`show c'</SAMP>; they could even be mouse-clicks or menu items--whatever
 523 suits your program.
 524
 525 <P>You should also get your employer (if you work as a programmer) or your
 526 school, if any, to sign a "copyright disclaimer" for the program, if
 527 necessary.  Here is a sample; alter the names:
 528
 529 <PRE>
 530 Yoyodyne, Inc., hereby disclaims all copyright
 531 interest in the program `Gnomovision'
 532 (which makes passes at compilers) written
 533 by James Hacker.
 534
 535 <VAR>signature of Ty Coon</VAR>, 1 April 1989
 536 Ty Coon, President of Vice
 537 </PRE>
 538
 539 <H2 CLASS="title"><A NAME="LGPL">GNU LIBRARY GENERAL PUBLIC LICENSE</A></H2>
 540
 541 <P>Version 2, June 1991
 542
 543 <PRE>
 544 Copyright (C) 1991 Free Software Foundation, Inc.
 545 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 546 Everyone is permitted to copy and distribute verbatim copies
 547 of this license document, but changing it is not allowed.
 548
 549 [This is the first released version of the library GPL.  It is
 550  numbered 2 because it goes with version 2 of the ordinary GPL.]
 551 </PRE>
 552
 553 <H3>Preamble</H3>
 554
 555 <P>The licenses for most software are designed to take away your
 556 freedom to share and change it.  By contrast, the GNU General Public
 557 Licenses are intended to guarantee your freedom to share and change
 558 free software--to make sure the software is free for all its users.
 559
 560 <P>This license, the Library General Public License, applies to some
 561 specially designated Free Software Foundation software, and to any
 562 other libraries whose authors decide to use it.  You can use it for
 563 your libraries, too.
 564
 565 <P>When we speak of free software, we are referring to freedom, not
 566 price.  Our General Public Licenses are designed to make sure that you
 567 have the freedom to distribute copies of free software (and charge for
 568 this service if you wish), that you receive source code or can get it
 569 if you want it, that you can change the software or use pieces of it
 570 in new free programs; and that you know you can do these things.
 571
 572 <P>To protect your rights, we need to make restrictions that forbid
 573 anyone to deny you these rights or to ask you to surrender the rights.
 574 These restrictions translate to certain responsibilities for you if
 575 you distribute copies of the library, or if you modify it.
 576
 577 <P>For example, if you distribute copies of the library, whether gratis
 578 or for a fee, you must give the recipients all the rights that we gave
 579 you.  You must make sure that they, too, receive or can get the source
 580 code.  If you link a program with the library, you must provide
 581 complete object files to the recipients so that they can relink them
 582 with the library, after making changes to the library and recompiling
 583 it.  And you must show them these terms so they know their rights.
 584
 585 <P>Our method of protecting your rights has two steps: (1) copyright
 586 the library, and (2) offer you this license which gives you legal
 587 permission to copy, distribute and/or modify the library.
 588
 589 <P>Also, for each distributor's protection, we want to make certain
 590 that everyone understands that there is no warranty for this free
 591 library.  If the library is modified by someone else and passed on, we
 592 want its recipients to know that what they have is not the original
 593 version, so that any problems introduced by others will not reflect on
 594 the original authors' reputations.
 595
 596 <P>Finally, any free program is threatened constantly by software
 597 patents.  We wish to avoid the danger that companies distributing free
 598 software will individually obtain patent licenses, thus in effect
 599 transforming the program into proprietary software.  To prevent this,
 600 we have made it clear that any patent must be licensed for everyone's
 601 free use or not licensed at all.
 602
 603 <P>Most GNU software, including some libraries, is covered by the ordinary
 604 GNU General Public License, which was designed for utility programs.  This
 605 license, the GNU Library General Public License, applies to certain
 606 designated libraries.  This license is quite different from the ordinary
 607 one; be sure to read it in full, and don't assume that anything in it is
 608 the same as in the ordinary license.
 609
 610 <P>The reason we have a separate public license for some libraries is that
 611 they blur the distinction we usually make between modifying or adding to a
 612 program and simply using it.  Linking a program with a library, without
 613 changing the library, is in some sense simply using the library, and is
 614 analogous to running a utility program or application program.  However, in
 615 a textual and legal sense, the linked executable is a combined work, a
 616 derivative of the original library, and the ordinary General Public License
 617 treats it as such.
 618
 619 <P>Because of this blurred distinction, using the ordinary General
 620 Public License for libraries did not effectively promote software
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1053 <PRE>
1054 Yoyodyne, Inc., hereby disclaims all copyright interest in
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1057
1058 <VAR>signature of Ty Coon</VAR>, 1 April 1990
1059 Ty Coon, President of Vice
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