Mercurial > sdl-ios-xcode

comparison COPYING @ 1298:e1b8e1b97b67

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
This library is now available under the LGPL 2.1, the major change of which is allowing linking with a shared object to be considered sufficient for complying with section 6 of the LGPL.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 30 Jan 2006 14:27:56 +0000
parents 74212992fb08
children
comparison
equal deleted inserted replaced
1297:7b32c7a586c9 1298:e1b8e1b97b67
1 GNU LIBRARY GENERAL PUBLIC LICENSE 1 GNU LESSER GENERAL PUBLIC LICENSE
2 Version 2, June 1991 2 Version 2.1, February 1999
3 3
4 Copyright (C) 1991 Free Software Foundation, Inc. 4 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
5 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 5 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
6 Everyone is permitted to copy and distribute verbatim copies 6 Everyone is permitted to copy and distribute verbatim copies
7 of this license document, but changing it is not allowed. 7 of this license document, but changing it is not allowed.
8 8
9 [This is the first released version of the library GPL. It is 9 [This is the first released version of the Lesser GPL. It also counts
10 numbered 2 because it goes with version 2 of the ordinary GPL.] 10 as the successor of the GNU Library Public License, version 2, hence
11 the version number 2.1.]
11 12
12 Preamble 13 Preamble
13 14
14 The licenses for most software are designed to take away your 15 The licenses for most software are designed to take away your
15 freedom to share and change it. By contrast, the GNU General Public 16 freedom to share and change it. By contrast, the GNU General Public
16 Licenses are intended to guarantee your freedom to share and change 17 Licenses are intended to guarantee your freedom to share and change
17 free software--to make sure the software is free for all its users. 18 free software--to make sure the software is free for all its users.
18 19
19 This license, the Library General Public License, applies to some 20 This license, the Lesser General Public License, applies to some
20 specially designated Free Software Foundation software, and to any 21 specially designated software packages--typically libraries--of the
21 other libraries whose authors decide to use it. You can use it for 22 Free Software Foundation and other authors who decide to use it. You
22 your libraries, too. 23 can use it too, but we suggest you first think carefully about whether
23 24 this license or the ordinary General Public License is the better
24 When we speak of free software, we are referring to freedom, not 25 strategy to use in any particular case, based on the explanations below.
25 price. Our General Public Licenses are designed to make sure that you 26
26 have the freedom to distribute copies of free software (and charge for 27 When we speak of free software, we are referring to freedom of use,
27 this service if you wish), that you receive source code or can get it 28 not price. Our General Public Licenses are designed to make sure that
28 if you want it, that you can change the software or use pieces of it 29 you have the freedom to distribute copies of free software (and charge
29 in new free programs; and that you know you can do these things. 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.
30 34
31 To protect your rights, we need to make restrictions that forbid 35 To protect your rights, we need to make restrictions that forbid
32 anyone to deny you these rights or to ask you to surrender the rights. 36 distributors to deny you these rights or to ask you to surrender these
33 These restrictions translate to certain responsibilities for you if 37 rights. These restrictions translate to certain responsibilities for
34 you distribute copies of the library, or if you modify it. 38 you if you distribute copies of the library or if you modify it.
35 39
36 For example, if you distribute copies of the library, whether gratis 40 For example, if you distribute copies of the library, whether gratis
37 or for a fee, you must give the recipients all the rights that we gave 41 or for a fee, you must give the recipients all the rights that we gave
38 you. You must make sure that they, too, receive or can get the source 42 you. You must make sure that they, too, receive or can get the source
39 code. If you link a program with the library, you must provide 43 code. If you link other code with the library, you must provide
40 complete object files to the recipients so that they can relink them 44 complete object files to the recipients, so that they can relink them
41 with the library, after making changes to the library and recompiling 45 with the library after making changes to the library and recompiling
42 it. And you must show them these terms so they know their rights. 46 it. And you must show them these terms so they know their rights.
43 47
44 Our method of protecting your rights has two steps: (1) copyright 48 We protect your rights with a two-step method: (1) we copyright the
45 the library, and (2) offer you this license which gives you legal 49 library, and (2) we offer you this license, which gives you legal
46 permission to copy, distribute and/or modify the library. 50 permission to copy, distribute and/or modify the library.
47 51
48 Also, for each distributor's protection, we want to make certain 52 To protect each distributor, we want to make it very clear that
49 that everyone understands that there is no warranty for this free 53 there is no warranty for the free library. Also, if the library is
50 library. If the library is modified by someone else and passed on, we 54 modified by someone else and passed on, the recipients should know
51 want its recipients to know that what they have is not the original 55 that what they have is not the original version, so that the original
52 version, so that any problems introduced by others will not reflect on 56 author's reputation will not be affected by problems that might be
53 the original authors' reputations. 57 introduced by others.
54 58
55 Finally, any free program is threatened constantly by software 59 Finally, software patents pose a constant threat to the existence of
56 patents. We wish to avoid the danger that companies distributing free 60 any free program. We wish to make sure that a company cannot
57 software will individually obtain patent licenses, thus in effect 61 effectively restrict the users of a free program by obtaining a
58 transforming the program into proprietary software. To prevent this, 62 restrictive license from a patent holder. Therefore, we insist that
59 we have made it clear that any patent must be licensed for everyone's 63 any patent license obtained for a version of the library must be
60 free use or not licensed at all. 64 consistent with the full freedom of use specified in this license.
61 65
62 Most GNU software, including some libraries, is covered by the ordinary 66 Most GNU software, including some libraries, is covered by the
63 GNU General Public License, which was designed for utility programs. This 67 ordinary GNU General Public License. This license, the GNU Lesser
64 license, the GNU Library General Public License, applies to certain 68 General Public License, applies to certain designated libraries, and
65 designated libraries. This license is quite different from the ordinary 69 is quite different from the ordinary General Public License. We use
66 one; be sure to read it in full, and don't assume that anything in it is 70 this license for certain libraries in order to permit linking those
67 the same as in the ordinary license. 71 libraries into non-free programs.
68 72
69 The reason we have a separate public license for some libraries is that 73 When a program is linked with a library, whether statically or using
70 they blur the distinction we usually make between modifying or adding to a 74 a shared library, the combination of the two is legally speaking a
71 program and simply using it. Linking a program with a library, without 75 combined work, a derivative of the original library. The ordinary
72 changing the library, is in some sense simply using the library, and is 76 General Public License therefore permits such linking only if the
73 analogous to running a utility program or application program. However, in 77 entire combination fits its criteria of freedom. The Lesser General
74 a textual and legal sense, the linked executable is a combined work, a 78 Public License permits more lax criteria for linking other code with
75 derivative of the original library, and the ordinary General Public License 79 the library.
76 treats it as such. 80
77 81 We call this license the "Lesser" General Public License because it
78 Because of this blurred distinction, using the ordinary General 82 does Less to protect the user's freedom than the ordinary General
79 Public License for libraries did not effectively promote software 83 Public License. It also provides other free software developers Less
80 sharing, because most developers did not use the libraries. We 84 of an advantage over competing non-free programs. These disadvantages
81 concluded that weaker conditions might promote sharing better. 85 are the reason we use the ordinary General Public License for many
82 86 libraries. However, the Lesser license provides advantages in certain
83 However, unrestricted linking of non-free programs would deprive the 87 special circumstances.
84 users of those programs of all benefit from the free status of the 88
85 libraries themselves. This Library General Public License is intended to 89 For example, on rare occasions, there may be a special need to
86 permit developers of non-free programs to use free libraries, while 90 encourage the widest possible use of a certain library, so that it becomes
87 preserving your freedom as a user of such programs to change the free 91 a de-facto standard. To achieve this, non-free programs must be
88 libraries that are incorporated in them. (We have not seen how to achieve 92 allowed to use the library. A more frequent case is that a free
89 this as regards changes in header files, but we have achieved it as regards 93 library does the same job as widely used non-free libraries. In this
90 changes in the actual functions of the Library.) The hope is that this 94 case, there is little to gain by limiting the free library to free
91 will lead to faster development of free libraries. 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.
92 108
93 The precise terms and conditions for copying, distribution and 109 The precise terms and conditions for copying, distribution and
94 modification follow. Pay close attention to the difference between a 110 modification follow. Pay close attention to the difference between a
95 "work based on the library" and a "work that uses the library". The 111 "work based on the library" and a "work that uses the library". The
96 former contains code derived from the library, while the latter only 112 former contains code derived from the library, whereas the latter must
97 works together with the library. 113 be combined with the library in order to run.
98 114
99 Note that it is possible for a library to be covered by the ordinary 115 GNU LESSER GENERAL PUBLIC LICENSE
100 General Public License rather than by this special one.
101
102 GNU LIBRARY GENERAL PUBLIC LICENSE
103 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 116 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
104 117
105 0. This License Agreement applies to any software library which 118 0. This License Agreement applies to any software library or other
106 contains a notice placed by the copyright holder or other authorized 119 program which contains a notice placed by the copyright holder or
107 party saying it may be distributed under the terms of this Library 120 other authorized party saying it may be distributed under the terms of
108 General Public License (also called "this License"). Each licensee is 121 this Lesser General Public License (also called "this License").
109 addressed as "you". 122 Each licensee is addressed as "you".
110 123
111 A "library" means a collection of software functions and/or data 124 A "library" means a collection of software functions and/or data
112 prepared so as to be conveniently linked with application programs 125 prepared so as to be conveniently linked with application programs
113 (which use some of those functions and data) to form executables. 126 (which use some of those functions and data) to form executables.
114 127
253 Otherwise, if the work is a derivative of the Library, you may 266 Otherwise, if the work is a derivative of the Library, you may
254 distribute the object code for the work under the terms of Section 6. 267 distribute the object code for the work under the terms of Section 6.
255 Any executables containing that work also fall under Section 6, 268 Any executables containing that work also fall under Section 6,
256 whether or not they are linked directly with the Library itself. 269 whether or not they are linked directly with the Library itself.
257 270
258 6. As an exception to the Sections above, you may also compile or 271 6. As an exception to the Sections above, you may also combine or
259 link a "work that uses the Library" with the Library to produce a 272 link a "work that uses the Library" with the Library to produce a
260 work containing portions of the Library, and distribute that work 273 work containing portions of the Library, and distribute that work
261 under terms of your choice, provided that the terms permit 274 under terms of your choice, provided that the terms permit
262 modification of the work for the customer's own use and reverse 275 modification of the work for the customer's own use and reverse
263 engineering for debugging such modifications. 276 engineering for debugging such modifications.
280 executable containing the modified Library. (It is understood 293 executable containing the modified Library. (It is understood
281 that the user who changes the contents of definitions files in the 294 that the user who changes the contents of definitions files in the
282 Library will not necessarily be able to recompile the application 295 Library will not necessarily be able to recompile the application
283 to use the modified definitions.) 296 to use the modified definitions.)
284 297
285 b) Accompany the work with a written offer, valid for at 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
286 least three years, to give the same user the materials 307 least three years, to give the same user the materials
287 specified in Subsection 6a, above, for a charge no more 308 specified in Subsection 6a, above, for a charge no more
288 than the cost of performing this distribution. 309 than the cost of performing this distribution.
289 310
290 c) If distribution of the work is made by offering access to copy 311 d) If distribution of the work is made by offering access to copy
291 from a designated place, offer equivalent access to copy the above 312 from a designated place, offer equivalent access to copy the above
292 specified materials from the same place. 313 specified materials from the same place.
293 314
294 d) Verify that the user has already received a copy of these 315 e) Verify that the user has already received a copy of these
295 materials or that you have already sent this user a copy. 316 materials or that you have already sent this user a copy.
296 317
297 For an executable, the required form of the "work that uses the 318 For an executable, the required form of the "work that uses the
298 Library" must include any data and utility programs needed for 319 Library" must include any data and utility programs needed for
299 reproducing the executable from it. However, as a special exception, 320 reproducing the executable from it. However, as a special exception,
300 the source code distributed need not include anything that is normally 321 the materials to be distributed need not include anything that is
301 distributed (in either source or binary form) with the major 322 normally distributed (in either source or binary form) with the major
302 components (compiler, kernel, and so on) of the operating system on 323 components (compiler, kernel, and so on) of the operating system on
303 which the executable runs, unless that component itself accompanies 324 which the executable runs, unless that component itself accompanies
304 the executable. 325 the executable.
305 326
306 It may happen that this requirement contradicts the license 327 It may happen that this requirement contradicts the license
345 10. Each time you redistribute the Library (or any work based on the 366 10. Each time you redistribute the Library (or any work based on the
346 Library), the recipient automatically receives a license from the 367 Library), the recipient automatically receives a license from the
347 original licensor to copy, distribute, link with or modify the Library 368 original licensor to copy, distribute, link with or modify the Library
348 subject to these terms and conditions. You may not impose any further 369 subject to these terms and conditions. You may not impose any further
349 restrictions on the recipients' exercise of the rights granted herein. 370 restrictions on the recipients' exercise of the rights granted herein.
350 You are not responsible for enforcing compliance by third parties to 371 You are not responsible for enforcing compliance by third parties with
351 this License. 372 this License.
352 373
353 11. If, as a consequence of a court judgment or allegation of patent 374 11. If, as a consequence of a court judgment or allegation of patent
354 infringement or for any other reason (not limited to patent issues), 375 infringement or for any other reason (not limited to patent issues),
355 conditions are imposed on you (whether by court order, agreement or 376 conditions are imposed on you (whether by court order, agreement or
388 so that distribution is permitted only in or among countries not thus 409 so that distribution is permitted only in or among countries not thus
389 excluded. In such case, this License incorporates the limitation as if 410 excluded. In such case, this License incorporates the limitation as if
390 written in the body of this License. 411 written in the body of this License.
391 412
392 13. The Free Software Foundation may publish revised and/or new 413 13. The Free Software Foundation may publish revised and/or new
393 versions of the Library General Public License from time to time. 414 versions of the Lesser General Public License from time to time.
394 Such new versions will be similar in spirit to the present version, 415 Such new versions will be similar in spirit to the present version,
395 but may differ in detail to address new problems or concerns. 416 but may differ in detail to address new problems or concerns.
396 417
397 Each version is given a distinguishing version number. If the Library 418 Each version is given a distinguishing version number. If the Library
398 specifies a version number of this License which applies to it and 419 specifies a version number of this License which applies to it and