COPYING
changeset 518 8bc9b5fd2aae
parent 287 a68a0f694976
child 601 05123263dab3
equal deleted inserted replaced
517:db215583bdcb 518:8bc9b5fd2aae
     1 		  GNU LESSER GENERAL PUBLIC LICENSE
     1 /*
     2 		       Version 2.1, February 1999
     2   SDL_mixer:  An audio mixer library based on the SDL library
       
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     3 
     4 
     4  Copyright (C) 1991, 1999 Free Software Foundation, Inc.
     5   This software is provided 'as-is', without any express or implied
     5      51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     6   warranty.  In no event will the authors be held liable for any damages
     6  Everyone is permitted to copy and distribute verbatim copies
     7   arising from the use of this software.
     7  of this license document, but changing it is not allowed.
       
     8 
     8 
     9 [This is the first released version of the Lesser GPL.  It also counts
     9   Permission is granted to anyone to use this software for any purpose,
    10  as the successor of the GNU Library Public License, version 2, hence
    10   including commercial applications, and to alter it and redistribute it
    11  the version number 2.1.]
    11   freely, subject to the following restrictions:
    12 
    12 
    13 			    Preamble
    13   1. The origin of this software must not be misrepresented; you must not
    14 
    14      claim that you wrote the original software. If you use this software
    15   The licenses for most software are designed to take away your
    15      in a product, an acknowledgment in the product documentation would be
    16 freedom to share and change it.  By contrast, the GNU General Public
    16      appreciated but is not required.
    17 Licenses are intended to guarantee your freedom to share and change
    17   2. Altered source versions must be plainly marked as such, and must not be
    18 free software--to make sure the software is free for all its users.
    18      misrepresented as being the original software.
    19 
    19   3. This notice may not be removed or altered from any source distribution.
    20   This license, the Lesser General Public License, applies to some
    20 */
    21 specially designated software packages--typically libraries--of the
       
    22 Free Software Foundation and other authors who decide to use it.  You
       
    23 can use it too, but we suggest you first think carefully about whether
       
    24 this license or the ordinary General Public License is the better
       
    25 strategy to use in any particular case, based on the explanations below.
       
    26 
       
    27   When we speak of free software, we are referring to freedom of use,
       
    28 not price.  Our General Public Licenses are designed to make sure that
       
    29 you have the freedom to distribute copies of free software (and charge
       
    30 for this service if you wish); that you receive source code or can get
       
    31 it if you want it; that you can change the software and use pieces of
       
    32 it in new free programs; and that you are informed that you can do
       
    33 these things.
       
    34 
       
    35   To protect your rights, we need to make restrictions that forbid
       
    36 distributors to deny you these rights or to ask you to surrender these
       
    37 rights.  These restrictions translate to certain responsibilities for
       
    38 you if you distribute copies of the library or if you modify it.
       
    39 
       
    40   For example, if you distribute copies of the library, whether gratis
       
    41 or for a fee, you must give the recipients all the rights that we gave
       
    42 you.  You must make sure that they, too, receive or can get the source
       
    43 code.  If you link other code with the library, you must provide
       
    44 complete object files to the recipients, so that they can relink them
       
    45 with the library after making changes to the library and recompiling
       
    46 it.  And you must show them these terms so they know their rights.
       
    47 
       
    48   We protect your rights with a two-step method: (1) we copyright the
       
    49 library, and (2) we offer you this license, which gives you legal
       
    50 permission to copy, distribute and/or modify the library.
       
    51 
       
    52   To protect each distributor, we want to make it very clear that
       
    53 there is no warranty for the free library.  Also, if the library is
       
    54 modified by someone else and passed on, the recipients should know
       
    55 that what they have is not the original version, so that the original
       
    56 author's reputation will not be affected by problems that might be
       
    57 introduced by others.
       
    58 
       
    59   Finally, software patents pose a constant threat to the existence of
       
    60 any free program.  We wish to make sure that a company cannot
       
    61 effectively restrict the users of a free program by obtaining a
       
    62 restrictive license from a patent holder.  Therefore, we insist that
       
    63 any patent license obtained for a version of the library must be
       
    64 consistent with the full freedom of use specified in this license.
       
    65 
       
    66   Most GNU software, including some libraries, is covered by the
       
    67 ordinary GNU General Public License.  This license, the GNU Lesser
       
    68 General Public License, applies to certain designated libraries, and
       
    69 is quite different from the ordinary General Public License.  We use
       
    70 this license for certain libraries in order to permit linking those
       
    71 libraries into non-free programs.
       
    72 
       
    73   When a program is linked with a library, whether statically or using
       
    74 a shared library, the combination of the two is legally speaking a
       
    75 combined work, a derivative of the original library.  The ordinary
       
    76 General Public License therefore permits such linking only if the
       
    77 entire combination fits its criteria of freedom.  The Lesser General
       
    78 Public License permits more lax criteria for linking other code with
       
    79 the library.
       
    80 
       
    81   We call this license the "Lesser" General Public License because it
       
    82 does Less to protect the user's freedom than the ordinary General
       
    83 Public License.  It also provides other free software developers Less
       
    84 of an advantage over competing non-free programs.  These disadvantages
       
    85 are the reason we use the ordinary General Public License for many
       
    86 libraries.  However, the Lesser license provides advantages in certain
       
    87 special circumstances.
       
    88 
       
    89   For example, on rare occasions, there may be a special need to
       
    90 encourage the widest possible use of a certain library, so that it becomes
       
    91 a de-facto standard.  To achieve this, non-free programs must be
       
    92 allowed to use the library.  A more frequent case is that a free
       
    93 library does the same job as widely used non-free libraries.  In this
       
    94 case, there is little to gain by limiting the free library to free
       
    95 software only, so we use the Lesser General Public License.
       
    96 
       
    97   In other cases, permission to use a particular library in non-free
       
    98 programs enables a greater number of people to use a large body of
       
    99 free software.  For example, permission to use the GNU C Library in
       
   100 non-free programs enables many more people to use the whole GNU
       
   101 operating system, as well as its variant, the GNU/Linux operating
       
   102 system.
       
   103 
       
   104   Although the Lesser General Public License is Less protective of the
       
   105 users' freedom, it does ensure that the user of a program that is
       
   106 linked with the Library has the freedom and the wherewithal to run
       
   107 that program using a modified version of the Library.
       
   108 
       
   109   The precise terms and conditions for copying, distribution and
       
   110 modification follow.  Pay close attention to the difference between a
       
   111 "work based on the library" and a "work that uses the library".  The
       
   112 former contains code derived from the library, whereas the latter must
       
   113 be combined with the library in order to run.
       
   114 
       
   115 		  GNU LESSER GENERAL PUBLIC LICENSE
       
   116    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
       
   117 
       
   118   0. This License Agreement applies to any software library or other
       
   119 program which contains a notice placed by the copyright holder or
       
   120 other authorized party saying it may be distributed under the terms of
       
   121 this Lesser General Public License (also called "this License").
       
   122 Each licensee is addressed as "you".
       
   123 
       
   124   A "library" means a collection of software functions and/or data
       
   125 prepared so as to be conveniently linked with application programs
       
   126 (which use some of those functions and data) to form executables.
       
   127 
       
   128   The "Library", below, refers to any such software library or work
       
   129 which has been distributed under these terms.  A "work based on the
       
   130 Library" means either the Library or any derivative work under
       
   131 copyright law: that is to say, a work containing the Library or a
       
   132 portion of it, either verbatim or with modifications and/or translated
       
   133 straightforwardly into another language.  (Hereinafter, translation is
       
   134 included without limitation in the term "modification".)
       
   135 
       
   136   "Source code" for a work means the preferred form of the work for
       
   137 making modifications to it.  For a library, complete source code means
       
   138 all the source code for all modules it contains, plus any associated
       
   139 interface definition files, plus the scripts used to control compilation
       
   140 and installation of the library.
       
   141 
       
   142   Activities other than copying, distribution and modification are not
       
   143 covered by this License; they are outside its scope.  The act of
       
   144 running a program using the Library is not restricted, and output from
       
   145 such a program is covered only if its contents constitute a work based
       
   146 on the Library (independent of the use of the Library in a tool for
       
   147 writing it).  Whether that is true depends on what the Library does
       
   148 and what the program that uses the Library does.
       
   149   
       
   150   1. You may copy and distribute verbatim copies of the Library's
       
   151 complete source code as you receive it, in any medium, provided that
       
   152 you conspicuously and appropriately publish on each copy an
       
   153 appropriate copyright notice and disclaimer of warranty; keep intact
       
   154 all the notices that refer to this License and to the absence of any
       
   155 warranty; and distribute a copy of this License along with the
       
   156 Library.
       
   157 
       
   158   You may charge a fee for the physical act of transferring a copy,
       
   159 and you may at your option offer warranty protection in exchange for a
       
   160 fee.
       
   161 
       
   162   2. You may modify your copy or copies of the Library or any portion
       
   163 of it, thus forming a work based on the Library, and copy and
       
   164 distribute such modifications or work under the terms of Section 1
       
   165 above, provided that you also meet all of these conditions:
       
   166 
       
   167     a) The modified work must itself be a software library.
       
   168 
       
   169     b) You must cause the files modified to carry prominent notices
       
   170     stating that you changed the files and the date of any change.
       
   171 
       
   172     c) You must cause the whole of the work to be licensed at no
       
   173     charge to all third parties under the terms of this License.
       
   174 
       
   175     d) If a facility in the modified Library refers to a function or a
       
   176     table of data to be supplied by an application program that uses
       
   177     the facility, other than as an argument passed when the facility
       
   178     is invoked, then you must make a good faith effort to ensure that,
       
   179     in the event an application does not supply such function or
       
   180     table, the facility still operates, and performs whatever part of
       
   181     its purpose remains meaningful.
       
   182 
       
   183     (For example, a function in a library to compute square roots has
       
   184     a purpose that is entirely well-defined independent of the
       
   185     application.  Therefore, Subsection 2d requires that any
       
   186     application-supplied function or table used by this function must
       
   187     be optional: if the application does not supply it, the square
       
   188     root function must still compute square roots.)
       
   189 
       
   190 These requirements apply to the modified work as a whole.  If
       
   191 identifiable sections of that work are not derived from the Library,
       
   192 and can be reasonably considered independent and separate works in
       
   193 themselves, then this License, and its terms, do not apply to those
       
   194 sections when you distribute them as separate works.  But when you
       
   195 distribute the same sections as part of a whole which is a work based
       
   196 on the Library, the distribution of the whole must be on the terms of
       
   197 this License, whose permissions for other licensees extend to the
       
   198 entire whole, and thus to each and every part regardless of who wrote
       
   199 it.
       
   200 
       
   201 Thus, it is not the intent of this section to claim rights or contest
       
   202 your rights to work written entirely by you; rather, the intent is to
       
   203 exercise the right to control the distribution of derivative or
       
   204 collective works based on the Library.
       
   205 
       
   206 In addition, mere aggregation of another work not based on the Library
       
   207 with the Library (or with a work based on the Library) on a volume of
       
   208 a storage or distribution medium does not bring the other work under
       
   209 the scope of this License.
       
   210 
       
   211   3. You may opt to apply the terms of the ordinary GNU General Public
       
   212 License instead of this License to a given copy of the Library.  To do
       
   213 this, you must alter all the notices that refer to this License, so
       
   214 that they refer to the ordinary GNU General Public License, version 2,
       
   215 instead of to this License.  (If a newer version than version 2 of the
       
   216 ordinary GNU General Public License has appeared, then you can specify
       
   217 that version instead if you wish.)  Do not make any other change in
       
   218 these notices.
       
   219 
       
   220   Once this change is made in a given copy, it is irreversible for
       
   221 that copy, so the ordinary GNU General Public License applies to all
       
   222 subsequent copies and derivative works made from that copy.
       
   223 
       
   224   This option is useful when you wish to copy part of the code of
       
   225 the Library into a program that is not a library.
       
   226 
       
   227   4. You may copy and distribute the Library (or a portion or
       
   228 derivative of it, under Section 2) in object code or executable form
       
   229 under the terms of Sections 1 and 2 above provided that you accompany
       
   230 it with the complete corresponding machine-readable source code, which
       
   231 must be distributed under the terms of Sections 1 and 2 above on a
       
   232 medium customarily used for software interchange.
       
   233 
       
   234   If distribution of object code is made by offering access to copy
       
   235 from a designated place, then offering equivalent access to copy the
       
   236 source code from the same place satisfies the requirement to
       
   237 distribute the source code, even though third parties are not
       
   238 compelled to copy the source along with the object code.
       
   239 
       
   240   5. A program that contains no derivative of any portion of the
       
   241 Library, but is designed to work with the Library by being compiled or
       
   242 linked with it, is called a "work that uses the Library".  Such a
       
   243 work, in isolation, is not a derivative work of the Library, and
       
   244 therefore falls outside the scope of this License.
       
   245 
       
   246   However, linking a "work that uses the Library" with the Library
       
   247 creates an executable that is a derivative of the Library (because it
       
   248 contains portions of the Library), rather than a "work that uses the
       
   249 library".  The executable is therefore covered by this License.
       
   250 Section 6 states terms for distribution of such executables.
       
   251 
       
   252   When a "work that uses the Library" uses material from a header file
       
   253 that is part of the Library, the object code for the work may be a
       
   254 derivative work of the Library even though the source code is not.
       
   255 Whether this is true is especially significant if the work can be
       
   256 linked without the Library, or if the work is itself a library.  The
       
   257 threshold for this to be true is not precisely defined by law.
       
   258 
       
   259   If such an object file uses only numerical parameters, data
       
   260 structure layouts and accessors, and small macros and small inline
       
   261 functions (ten lines or less in length), then the use of the object
       
   262 file is unrestricted, regardless of whether it is legally a derivative
       
   263 work.  (Executables containing this object code plus portions of the
       
   264 Library will still fall under Section 6.)
       
   265 
       
   266   Otherwise, if the work is a derivative of the Library, you may
       
   267 distribute the object code for the work under the terms of Section 6.
       
   268 Any executables containing that work also fall under Section 6,
       
   269 whether or not they are linked directly with the Library itself.
       
   270 
       
   271   6. As an exception to the Sections above, you may also combine or
       
   272 link a "work that uses the Library" with the Library to produce a
       
   273 work containing portions of the Library, and distribute that work
       
   274 under terms of your choice, provided that the terms permit
       
   275 modification of the work for the customer's own use and reverse
       
   276 engineering for debugging such modifications.
       
   277 
       
   278   You must give prominent notice with each copy of the work that the
       
   279 Library is used in it and that the Library and its use are covered by
       
   280 this License.  You must supply a copy of this License.  If the work
       
   281 during execution displays copyright notices, you must include the
       
   282 copyright notice for the Library among them, as well as a reference
       
   283 directing the user to the copy of this License.  Also, you must do one
       
   284 of these things:
       
   285 
       
   286     a) Accompany the work with the complete corresponding
       
   287     machine-readable source code for the Library including whatever
       
   288     changes were used in the work (which must be distributed under
       
   289     Sections 1 and 2 above); and, if the work is an executable linked
       
   290     with the Library, with the complete machine-readable "work that
       
   291     uses the Library", as object code and/or source code, so that the
       
   292     user can modify the Library and then relink to produce a modified
       
   293     executable containing the modified Library.  (It is understood
       
   294     that the user who changes the contents of definitions files in the
       
   295     Library will not necessarily be able to recompile the application
       
   296     to use the modified definitions.)
       
   297 
       
   298     b) Use a suitable shared library mechanism for linking with the
       
   299     Library.  A suitable mechanism is one that (1) uses at run time a
       
   300     copy of the library already present on the user's computer system,
       
   301     rather than copying library functions into the executable, and (2)
       
   302     will operate properly with a modified version of the library, if
       
   303     the user installs one, as long as the modified version is
       
   304     interface-compatible with the version that the work was made with.
       
   305 
       
   306     c) Accompany the work with a written offer, valid for at
       
   307     least three years, to give the same user the materials
       
   308     specified in Subsection 6a, above, for a charge no more
       
   309     than the cost of performing this distribution.
       
   310 
       
   311     d) If distribution of the work is made by offering access to copy
       
   312     from a designated place, offer equivalent access to copy the above
       
   313     specified materials from the same place.
       
   314 
       
   315     e) Verify that the user has already received a copy of these
       
   316     materials or that you have already sent this user a copy.
       
   317 
       
   318   For an executable, the required form of the "work that uses the
       
   319 Library" must include any data and utility programs needed for
       
   320 reproducing the executable from it.  However, as a special exception,
       
   321 the materials to be distributed need not include anything that is
       
   322 normally distributed (in either source or binary form) with the major
       
   323 components (compiler, kernel, and so on) of the operating system on
       
   324 which the executable runs, unless that component itself accompanies
       
   325 the executable.
       
   326 
       
   327   It may happen that this requirement contradicts the license
       
   328 restrictions of other proprietary libraries that do not normally
       
   329 accompany the operating system.  Such a contradiction means you cannot
       
   330 use both them and the Library together in an executable that you
       
   331 distribute.
       
   332 
       
   333   7. You may place library facilities that are a work based on the
       
   334 Library side-by-side in a single library together with other library
       
   335 facilities not covered by this License, and distribute such a combined
       
   336 library, provided that the separate distribution of the work based on
       
   337 the Library and of the other library facilities is otherwise
       
   338 permitted, and provided that you do these two things:
       
   339 
       
   340     a) Accompany the combined library with a copy of the same work
       
   341     based on the Library, uncombined with any other library
       
   342     facilities.  This must be distributed under the terms of the
       
   343     Sections above.
       
   344 
       
   345     b) Give prominent notice with the combined library of the fact
       
   346     that part of it is a work based on the Library, and explaining
       
   347     where to find the accompanying uncombined form of the same work.
       
   348 
       
   349   8. You may not copy, modify, sublicense, link with, or distribute
       
   350 the Library except as expressly provided under this License.  Any
       
   351 attempt otherwise to copy, modify, sublicense, link with, or
       
   352 distribute the Library is void, and will automatically terminate your
       
   353 rights under this License.  However, parties who have received copies,
       
   354 or rights, from you under this License will not have their licenses
       
   355 terminated so long as such parties remain in full compliance.
       
   356 
       
   357   9. You are not required to accept this License, since you have not
       
   358 signed it.  However, nothing else grants you permission to modify or
       
   359 distribute the Library or its derivative works.  These actions are
       
   360 prohibited by law if you do not accept this License.  Therefore, by
       
   361 modifying or distributing the Library (or any work based on the
       
   362 Library), you indicate your acceptance of this License to do so, and
       
   363 all its terms and conditions for copying, distributing or modifying
       
   364 the Library or works based on it.
       
   365 
       
   366   10. Each time you redistribute the Library (or any work based on the
       
   367 Library), the recipient automatically receives a license from the
       
   368 original licensor to copy, distribute, link with or modify the Library
       
   369 subject to these terms and conditions.  You may not impose any further
       
   370 restrictions on the recipients' exercise of the rights granted herein.
       
   371 You are not responsible for enforcing compliance by third parties with
       
   372 this License.
       
   373 
       
   374   11. If, as a consequence of a court judgment or allegation of patent
       
   375 infringement or for any other reason (not limited to patent issues),
       
   376 conditions are imposed on you (whether by court order, agreement or
       
   377 otherwise) that contradict the conditions of this License, they do not
       
   378 excuse you from the conditions of this License.  If you cannot
       
   379 distribute so as to satisfy simultaneously your obligations under this
       
   380 License and any other pertinent obligations, then as a consequence you
       
   381 may not distribute the Library at all.  For example, if a patent
       
   382 license would not permit royalty-free redistribution of the Library by
       
   383 all those who receive copies directly or indirectly through you, then
       
   384 the only way you could satisfy both it and this License would be to
       
   385 refrain entirely from distribution of the Library.
       
   386 
       
   387 If any portion of this section is held invalid or unenforceable under any
       
   388 particular circumstance, the balance of the section is intended to apply,
       
   389 and the section as a whole is intended to apply in other circumstances.
       
   390 
       
   391 It is not the purpose of this section to induce you to infringe any
       
   392 patents or other property right claims or to contest validity of any
       
   393 such claims; this section has the sole purpose of protecting the
       
   394 integrity of the free software distribution system which is
       
   395 implemented by public license practices.  Many people have made
       
   396 generous contributions to the wide range of software distributed
       
   397 through that system in reliance on consistent application of that
       
   398 system; it is up to the author/donor to decide if he or she is willing
       
   399 to distribute software through any other system and a licensee cannot
       
   400 impose that choice.
       
   401 
       
   402 This section is intended to make thoroughly clear what is believed to
       
   403 be a consequence of the rest of this License.
       
   404 
       
   405   12. If the distribution and/or use of the Library is restricted in
       
   406 certain countries either by patents or by copyrighted interfaces, the
       
   407 original copyright holder who places the Library under this License may add
       
   408 an explicit geographical distribution limitation excluding those countries,
       
   409 so that distribution is permitted only in or among countries not thus
       
   410 excluded.  In such case, this License incorporates the limitation as if
       
   411 written in the body of this License.
       
   412 
       
   413   13. The Free Software Foundation may publish revised and/or new
       
   414 versions of the Lesser General Public License from time to time.
       
   415 Such new versions will be similar in spirit to the present version,
       
   416 but may differ in detail to address new problems or concerns.
       
   417 
       
   418 Each version is given a distinguishing version number.  If the Library
       
   419 specifies a version number of this License which applies to it and
       
   420 "any later version", you have the option of following the terms and
       
   421 conditions either of that version or of any later version published by
       
   422 the Free Software Foundation.  If the Library does not specify a
       
   423 license version number, you may choose any version ever published by
       
   424 the Free Software Foundation.
       
   425 
       
   426   14. If you wish to incorporate parts of the Library into other free
       
   427 programs whose distribution conditions are incompatible with these,
       
   428 write to the author to ask for permission.  For software which is
       
   429 copyrighted by the Free Software Foundation, write to the Free
       
   430 Software Foundation; we sometimes make exceptions for this.  Our
       
   431 decision will be guided by the two goals of preserving the free status
       
   432 of all derivatives of our free software and of promoting the sharing
       
   433 and reuse of software generally.
       
   434 
       
   435 			    NO WARRANTY
       
   436 
       
   437   15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
       
   438 WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
       
   439 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
       
   440 OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
       
   441 KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
       
   442 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       
   443 PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
       
   444 LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
       
   445 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
       
   446 
       
   447   16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
       
   448 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
       
   449 AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
       
   450 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
       
   451 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
       
   452 LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
       
   453 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
       
   454 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
       
   455 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
       
   456 DAMAGES.
       
   457 
       
   458 		     END OF TERMS AND CONDITIONS