annotate COPYING @ 587:f00ccf8d8edc

Added code to testsprite to detect tearing when flipping
author Sam Lantinga <slouken@libsdl.org>
date Sat, 01 Feb 2003 19:56:45 +0000
parents 74212992fb08
children e1b8e1b97b67
rev   line source
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1 GNU LIBRARY GENERAL PUBLIC LICENSE
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2 Version 2, June 1991
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3
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4 Copyright (C) 1991 Free Software Foundation, Inc.
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5 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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6 Everyone is permitted to copy and distribute verbatim copies
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7 of this license document, but changing it is not allowed.
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8
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9 [This is the first released version of the library GPL. It is
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10 numbered 2 because it goes with version 2 of the ordinary GPL.]
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11
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12 Preamble
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13
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14 The licenses for most software are designed to take away your
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15 freedom to share and change it. By contrast, the GNU General Public
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16 Licenses are intended to guarantee your freedom to share and change
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17 free software--to make sure the software is free for all its users.
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18
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19 This license, the Library General Public License, applies to some
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20 specially designated Free Software Foundation software, and to any
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21 other libraries whose authors decide to use it. You can use it for
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22 your libraries, too.
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23
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24 When we speak of free software, we are referring to freedom, not
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25 price. Our General Public Licenses are designed to make sure that you
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26 have the freedom to distribute copies of free software (and charge for
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27 this service if you wish), that you receive source code or can get it
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28 if you want it, that you can change the software or use pieces of it
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29 in new free programs; and that you know you can do these things.
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30
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31 To protect your rights, we need to make restrictions that forbid
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32 anyone to deny you these rights or to ask you to surrender the rights.
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33 These restrictions translate to certain responsibilities for you if
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34 you distribute copies of the library, or if you modify it.
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35
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36 For example, if you distribute copies of the library, whether gratis
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37 or for a fee, you must give the recipients all the rights that we gave
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38 you. You must make sure that they, too, receive or can get the source
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39 code. If you link a program with the library, you must provide
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40 complete object files to the recipients so that they can relink them
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41 with the library, after making changes to the library and recompiling
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42 it. And you must show them these terms so they know their rights.
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43
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44 Our method of protecting your rights has two steps: (1) copyright
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45 the library, and (2) offer you this license which gives you legal
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46 permission to copy, distribute and/or modify the library.
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47
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48 Also, for each distributor's protection, we want to make certain
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49 that everyone understands that there is no warranty for this free
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50 library. If the library is modified by someone else and passed on, we
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51 want its recipients to know that what they have is not the original
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52 version, so that any problems introduced by others will not reflect on
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53 the original authors' reputations.
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54
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55 Finally, any free program is threatened constantly by software
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56 patents. We wish to avoid the danger that companies distributing free
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57 software will individually obtain patent licenses, thus in effect
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58 transforming the program into proprietary software. To prevent this,
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59 we have made it clear that any patent must be licensed for everyone's
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60 free use or not licensed at all.
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61
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62 Most GNU software, including some libraries, is covered by the ordinary
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63 GNU General Public License, which was designed for utility programs. This
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64 license, the GNU Library General Public License, applies to certain
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65 designated libraries. This license is quite different from the ordinary
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66 one; be sure to read it in full, and don't assume that anything in it is
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67 the same as in the ordinary license.
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68
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69 The reason we have a separate public license for some libraries is that
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70 they blur the distinction we usually make between modifying or adding to a
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71 program and simply using it. Linking a program with a library, without
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72 changing the library, is in some sense simply using the library, and is
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73 analogous to running a utility program or application program. However, in
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74 a textual and legal sense, the linked executable is a combined work, a
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75 derivative of the original library, and the ordinary General Public License
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76 treats it as such.
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77
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78 Because of this blurred distinction, using the ordinary General
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79 Public License for libraries did not effectively promote software
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80 sharing, because most developers did not use the libraries. We
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81 concluded that weaker conditions might promote sharing better.
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82
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83 However, unrestricted linking of non-free programs would deprive the
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84 users of those programs of all benefit from the free status of the
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85 libraries themselves. This Library General Public License is intended to
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86 permit developers of non-free programs to use free libraries, while
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87 preserving your freedom as a user of such programs to change the free
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88 libraries that are incorporated in them. (We have not seen how to achieve
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89 this as regards changes in header files, but we have achieved it as regards
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90 changes in the actual functions of the Library.) The hope is that this
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91 will lead to faster development of free libraries.
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92
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93 The precise terms and conditions for copying, distribution and
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94 modification follow. Pay close attention to the difference between a
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95 "work based on the library" and a "work that uses the library". The
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96 former contains code derived from the library, while the latter only
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97 works together with the library.
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98
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99 Note that it is possible for a library to be covered by the ordinary
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100 General Public License rather than by this special one.
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101
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102 GNU LIBRARY GENERAL PUBLIC LICENSE
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103 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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104
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105 0. This License Agreement applies to any software library which
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106 contains a notice placed by the copyright holder or other authorized
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107 party saying it may be distributed under the terms of this Library
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108 General Public License (also called "this License"). Each licensee is
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109 addressed as "you".
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110
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111 A "library" means a collection of software functions and/or data
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112 prepared so as to be conveniently linked with application programs
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113 (which use some of those functions and data) to form executables.
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114
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115 The "Library", below, refers to any such software library or work
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116 which has been distributed under these terms. A "work based on the
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117 Library" means either the Library or any derivative work under
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118 copyright law: that is to say, a work containing the Library or a
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119 portion of it, either verbatim or with modifications and/or translated
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120 straightforwardly into another language. (Hereinafter, translation is
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121 included without limitation in the term "modification".)
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122
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123 "Source code" for a work means the preferred form of the work for
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124 making modifications to it. For a library, complete source code means
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125 all the source code for all modules it contains, plus any associated
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126 interface definition files, plus the scripts used to control compilation
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127 and installation of the library.
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128
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129 Activities other than copying, distribution and modification are not
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130 covered by this License; they are outside its scope. The act of
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131 running a program using the Library is not restricted, and output from
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132 such a program is covered only if its contents constitute a work based
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133 on the Library (independent of the use of the Library in a tool for
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134 writing it). Whether that is true depends on what the Library does
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135 and what the program that uses the Library does.
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136
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137 1. You may copy and distribute verbatim copies of the Library's
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138 complete source code as you receive it, in any medium, provided that
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139 you conspicuously and appropriately publish on each copy an
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140 appropriate copyright notice and disclaimer of warranty; keep intact
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141 all the notices that refer to this License and to the absence of any
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142 warranty; and distribute a copy of this License along with the
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143 Library.
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144
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145 You may charge a fee for the physical act of transferring a copy,
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146 and you may at your option offer warranty protection in exchange for a
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147 fee.
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148
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149 2. You may modify your copy or copies of the Library or any portion
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150 of it, thus forming a work based on the Library, and copy and
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151 distribute such modifications or work under the terms of Section 1
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152 above, provided that you also meet all of these conditions:
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153
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154 a) The modified work must itself be a software library.
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155
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156 b) You must cause the files modified to carry prominent notices
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157 stating that you changed the files and the date of any change.
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158
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159 c) You must cause the whole of the work to be licensed at no
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160 charge to all third parties under the terms of this License.
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161
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162 d) If a facility in the modified Library refers to a function or a
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163 table of data to be supplied by an application program that uses
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164 the facility, other than as an argument passed when the facility
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165 is invoked, then you must make a good faith effort to ensure that,
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166 in the event an application does not supply such function or
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167 table, the facility still operates, and performs whatever part of
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168 its purpose remains meaningful.
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169
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170 (For example, a function in a library to compute square roots has
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171 a purpose that is entirely well-defined independent of the
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172 application. Therefore, Subsection 2d requires that any
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173 application-supplied function or table used by this function must
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174 be optional: if the application does not supply it, the square
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175 root function must still compute square roots.)
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176
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177 These requirements apply to the modified work as a whole. If
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178 identifiable sections of that work are not derived from the Library,
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179 and can be reasonably considered independent and separate works in
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180 themselves, then this License, and its terms, do not apply to those
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181 sections when you distribute them as separate works. But when you
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182 distribute the same sections as part of a whole which is a work based
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183 on the Library, the distribution of the whole must be on the terms of
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184 this License, whose permissions for other licensees extend to the
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185 entire whole, and thus to each and every part regardless of who wrote
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186 it.
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187
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188 Thus, it is not the intent of this section to claim rights or contest
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189 your rights to work written entirely by you; rather, the intent is to
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190 exercise the right to control the distribution of derivative or
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191 collective works based on the Library.
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192
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193 In addition, mere aggregation of another work not based on the Library
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194 with the Library (or with a work based on the Library) on a volume of
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195 a storage or distribution medium does not bring the other work under
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196 the scope of this License.
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197
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198 3. You may opt to apply the terms of the ordinary GNU General Public
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199 License instead of this License to a given copy of the Library. To do
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200 this, you must alter all the notices that refer to this License, so
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201 that they refer to the ordinary GNU General Public License, version 2,
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202 instead of to this License. (If a newer version than version 2 of the
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203 ordinary GNU General Public License has appeared, then you can specify
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204 that version instead if you wish.) Do not make any other change in
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205 these notices.
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206
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207 Once this change is made in a given copy, it is irreversible for
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208 that copy, so the ordinary GNU General Public License applies to all
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209 subsequent copies and derivative works made from that copy.
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210
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211 This option is useful when you wish to copy part of the code of
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212 the Library into a program that is not a library.
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213
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214 4. You may copy and distribute the Library (or a portion or
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215 derivative of it, under Section 2) in object code or executable form
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216 under the terms of Sections 1 and 2 above provided that you accompany
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217 it with the complete corresponding machine-readable source code, which
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218 must be distributed under the terms of Sections 1 and 2 above on a
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219 medium customarily used for software interchange.
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220
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221 If distribution of object code is made by offering access to copy
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222 from a designated place, then offering equivalent access to copy the
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223 source code from the same place satisfies the requirement to
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224 distribute the source code, even though third parties are not
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225 compelled to copy the source along with the object code.
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226
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227 5. A program that contains no derivative of any portion of the
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228 Library, but is designed to work with the Library by being compiled or
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229 linked with it, is called a "work that uses the Library". Such a
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230 work, in isolation, is not a derivative work of the Library, and
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231 therefore falls outside the scope of this License.
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232
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233 However, linking a "work that uses the Library" with the Library
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234 creates an executable that is a derivative of the Library (because it
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235 contains portions of the Library), rather than a "work that uses the
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236 library". The executable is therefore covered by this License.
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237 Section 6 states terms for distribution of such executables.
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238
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239 When a "work that uses the Library" uses material from a header file
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240 that is part of the Library, the object code for the work may be a
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241 derivative work of the Library even though the source code is not.
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242 Whether this is true is especially significant if the work can be
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243 linked without the Library, or if the work is itself a library. The
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244 threshold for this to be true is not precisely defined by law.
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245
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246 If such an object file uses only numerical parameters, data
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247 structure layouts and accessors, and small macros and small inline
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248 functions (ten lines or less in length), then the use of the object
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249 file is unrestricted, regardless of whether it is legally a derivative
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250 work. (Executables containing this object code plus portions of the
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251 Library will still fall under Section 6.)
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252
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253 Otherwise, if the work is a derivative of the Library, you may
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254 distribute the object code for the work under the terms of Section 6.
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255 Any executables containing that work also fall under Section 6,
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256 whether or not they are linked directly with the Library itself.
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257
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258 6. As an exception to the Sections above, you may also compile or
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259 link a "work that uses the Library" with the Library to produce a
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260 work containing portions of the Library, and distribute that work
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261 under terms of your choice, provided that the terms permit
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262 modification of the work for the customer's own use and reverse
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263 engineering for debugging such modifications.
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264
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265 You must give prominent notice with each copy of the work that the
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266 Library is used in it and that the Library and its use are covered by
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267 this License. You must supply a copy of this License. If the work
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268 during execution displays copyright notices, you must include the
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269 copyright notice for the Library among them, as well as a reference
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270 directing the user to the copy of this License. Also, you must do one
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271 of these things:
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272
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273 a) Accompany the work with the complete corresponding
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274 machine-readable source code for the Library including whatever
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275 changes were used in the work (which must be distributed under
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276 Sections 1 and 2 above); and, if the work is an executable linked
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277 with the Library, with the complete machine-readable "work that
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278 uses the Library", as object code and/or source code, so that the
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279 user can modify the Library and then relink to produce a modified
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280 executable containing the modified Library. (It is understood
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281 that the user who changes the contents of definitions files in the
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282 Library will not necessarily be able to recompile the application
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283 to use the modified definitions.)
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284
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285 b) Accompany the work with a written offer, valid for at
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286 least three years, to give the same user the materials
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287 specified in Subsection 6a, above, for a charge no more
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288 than the cost of performing this distribution.
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289
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290 c) If distribution of the work is made by offering access to copy
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291 from a designated place, offer equivalent access to copy the above
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292 specified materials from the same place.
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293
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294 d) Verify that the user has already received a copy of these
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295 materials or that you have already sent this user a copy.
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296
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297 For an executable, the required form of the "work that uses the
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298 Library" must include any data and utility programs needed for
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299 reproducing the executable from it. However, as a special exception,
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300 the source code distributed need not include anything that is normally
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301 distributed (in either source or binary form) with the major
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302 components (compiler, kernel, and so on) of the operating system on
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303 which the executable runs, unless that component itself accompanies
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304 the executable.
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305
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306 It may happen that this requirement contradicts the license
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307 restrictions of other proprietary libraries that do not normally
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308 accompany the operating system. Such a contradiction means you cannot
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309 use both them and the Library together in an executable that you
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310 distribute.
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311
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312 7. You may place library facilities that are a work based on the
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313 Library side-by-side in a single library together with other library
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314 facilities not covered by this License, and distribute such a combined
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315 library, provided that the separate distribution of the work based on
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316 the Library and of the other library facilities is otherwise
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317 permitted, and provided that you do these two things:
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318
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319 a) Accompany the combined library with a copy of the same work
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320 based on the Library, uncombined with any other library
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321 facilities. This must be distributed under the terms of the
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322 Sections above.
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323
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324 b) Give prominent notice with the combined library of the fact
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325 that part of it is a work based on the Library, and explaining
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326 where to find the accompanying uncombined form of the same work.
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327
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328 8. You may not copy, modify, sublicense, link with, or distribute
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329 the Library except as expressly provided under this License. Any
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330 attempt otherwise to copy, modify, sublicense, link with, or
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331 distribute the Library is void, and will automatically terminate your
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332 rights under this License. However, parties who have received copies,
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333 or rights, from you under this License will not have their licenses
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334 terminated so long as such parties remain in full compliance.
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335
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336 9. You are not required to accept this License, since you have not
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337 signed it. However, nothing else grants you permission to modify or
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338 distribute the Library or its derivative works. These actions are
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339 prohibited by law if you do not accept this License. Therefore, by
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340 modifying or distributing the Library (or any work based on the
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341 Library), you indicate your acceptance of this License to do so, and
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342 all its terms and conditions for copying, distributing or modifying
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343 the Library or works based on it.
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344
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345 10. Each time you redistribute the Library (or any work based on the
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346 Library), the recipient automatically receives a license from the
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347 original licensor to copy, distribute, link with or modify the Library
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348 subject to these terms and conditions. You may not impose any further
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349 restrictions on the recipients' exercise of the rights granted herein.
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350 You are not responsible for enforcing compliance by third parties to
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351 this License.
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352
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353 11. If, as a consequence of a court judgment or allegation of patent
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354 infringement or for any other reason (not limited to patent issues),
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355 conditions are imposed on you (whether by court order, agreement or
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356 otherwise) that contradict the conditions of this License, they do not
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357 excuse you from the conditions of this License. If you cannot
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358 distribute so as to satisfy simultaneously your obligations under this
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359 License and any other pertinent obligations, then as a consequence you
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360 may not distribute the Library at all. For example, if a patent
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361 license would not permit royalty-free redistribution of the Library by
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362 all those who receive copies directly or indirectly through you, then
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363 the only way you could satisfy both it and this License would be to
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364 refrain entirely from distribution of the Library.
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365
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366 If any portion of this section is held invalid or unenforceable under any
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367 particular circumstance, the balance of the section is intended to apply,
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368 and the section as a whole is intended to apply in other circumstances.
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369
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370 It is not the purpose of this section to induce you to infringe any
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371 patents or other property right claims or to contest validity of any
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372 such claims; this section has the sole purpose of protecting the
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373 integrity of the free software distribution system which is
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374 implemented by public license practices. Many people have made
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375 generous contributions to the wide range of software distributed
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376 through that system in reliance on consistent application of that
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377 system; it is up to the author/donor to decide if he or she is willing
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378 to distribute software through any other system and a licensee cannot
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379 impose that choice.
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380
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381 This section is intended to make thoroughly clear what is believed to
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382 be a consequence of the rest of this License.
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383
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384 12. If the distribution and/or use of the Library is restricted in
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385 certain countries either by patents or by copyrighted interfaces, the
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386 original copyright holder who places the Library under this License may add
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387 an explicit geographical distribution limitation excluding those countries,
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388 so that distribution is permitted only in or among countries not thus
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389 excluded. In such case, this License incorporates the limitation as if
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390 written in the body of this License.
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391
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392 13. The Free Software Foundation may publish revised and/or new
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393 versions of the Library General Public License from time to time.
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394 Such new versions will be similar in spirit to the present version,
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395 but may differ in detail to address new problems or concerns.
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396
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397 Each version is given a distinguishing version number. If the Library
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398 specifies a version number of this License which applies to it and
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399 "any later version", you have the option of following the terms and
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400 conditions either of that version or of any later version published by
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401 the Free Software Foundation. If the Library does not specify a
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402 license version number, you may choose any version ever published by
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403 the Free Software Foundation.
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404
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405 14. If you wish to incorporate parts of the Library into other free
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406 programs whose distribution conditions are incompatible with these,
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407 write to the author to ask for permission. For software which is
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408 copyrighted by the Free Software Foundation, write to the Free
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409 Software Foundation; we sometimes make exceptions for this. Our
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410 decision will be guided by the two goals of preserving the free status
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411 of all derivatives of our free software and of promoting the sharing
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412 and reuse of software generally.
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413
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414 NO WARRANTY
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415
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416 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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417 WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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418 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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419 OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
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420 KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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421 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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422 PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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423 LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
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424 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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425
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426 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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427 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
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428 AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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429 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
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430 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
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431 LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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432 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
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433 FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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434 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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435 DAMAGES.
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436
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437 END OF TERMS AND CONDITIONS