| 1 | The GNU General Public License, Version 2, June 1991 (GPLv2) |
| 2 | ============================================================ |
| 3 | |
| 4 | > Copyright (C) 1989, 1991 Free Software Foundation, Inc. |
| 5 | > 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA |
| 6 | |
| 7 | Everyone is permitted to copy and distribute verbatim copies of this license |
| 8 | document, but changing it is not allowed. |
| 9 | |
| 10 | |
| 11 | Preamble |
| 12 | -------- |
| 13 | |
| 14 | The licenses for most software are designed to take away your freedom to share |
| 15 | and change it. By contrast, the GNU General Public License is intended to |
| 16 | guarantee your freedom to share and change free software--to make sure the |
| 17 | software is free for all its users. This General Public License applies to most |
| 18 | of the Free Software Foundation's software and to any other program whose |
| 19 | authors commit to using it. (Some other Free Software Foundation software is |
| 20 | covered by the GNU Lesser General Public License instead.) You can apply it to |
| 21 | your programs, too. |
| 22 | |
| 23 | When we speak of free software, we are referring to freedom, not price. Our |
| 24 | General Public Licenses are designed to make sure that you have the freedom to |
| 25 | distribute copies of free software (and charge for this service if you wish), |
| 26 | that you receive source code or can get it if you want it, that you can change |
| 27 | the software or use pieces of it in new free programs; and that you know you can |
| 28 | do these things. |
| 29 | |
| 30 | To protect your rights, we need to make restrictions that forbid anyone to deny |
| 31 | you these rights or to ask you to surrender the rights. These restrictions |
| 32 | translate to certain responsibilities for you if you distribute copies of the |
| 33 | software, or if you modify it. |
| 34 | |
| 35 | For example, if you distribute copies of such a program, whether gratis or for a |
| 36 | fee, you must give the recipients all the rights that you have. You must make |
| 37 | sure that they, too, receive or can get the source code. And you must show them |
| 38 | these terms so they know their rights. |
| 39 | |
| 40 | We protect your rights with two steps: (1) copyright the software, and (2) offer |
| 41 | you this license which gives you legal permission to copy, distribute and/or |
| 42 | modify the software. |
| 43 | |
| 44 | Also, for each author's protection and ours, we want to make certain that |
| 45 | everyone understands that there is no warranty for this free software. If the |
| 46 | software is modified by someone else and passed on, we want its recipients to |
| 47 | know that what they have is not the original, so that any problems introduced by |
| 48 | others will not reflect on the original authors' reputations. |
| 49 | |
| 50 | Finally, any free program is threatened constantly by software patents. We wish |
| 51 | to avoid the danger that redistributors of a free program will individually |
| 52 | obtain patent licenses, in effect making the program proprietary. To prevent |
| 53 | this, we have made it clear that any patent must be licensed for everyone's free |
| 54 | use or not licensed at all. |
| 55 | |
| 56 | The precise terms and conditions for copying, distribution and modification |
| 57 | follow. |
| 58 | |
| 59 | |
| 60 | Terms And Conditions For Copying, Distribution And Modification |
| 61 | --------------------------------------------------------------- |
| 62 | |
| 63 | **0.** This License applies to any program or other work which contains a notice |
| 64 | placed by the copyright holder saying it may be distributed under the terms of |
| 65 | this General Public License. The "Program", below, refers to any such program or |
| 66 | work, and a "work based on the Program" means either the Program or any |
| 67 | derivative work under copyright law: that is to say, a work containing the |
| 68 | Program or a portion of it, either verbatim or with modifications and/or |
| 69 | translated into another language. (Hereinafter, translation is included without |
| 70 | limitation in the term "modification".) Each licensee is addressed as "you". |
| 71 | |
| 72 | Activities other than copying, distribution and modification are not covered by |
| 73 | this License; they are outside its scope. The act of running the Program is not |
| 74 | restricted, and the output from the Program is covered only if its contents |
| 75 | constitute a work based on the Program (independent of having been made by |
| 76 | running the Program). Whether that is true depends on what the Program does. |
| 77 | |
| 78 | **1.** You may copy and distribute verbatim copies of the Program's source code |
| 79 | as you receive it, in any medium, provided that you conspicuously and |
| 80 | appropriately publish on each copy an appropriate copyright notice and |
| 81 | disclaimer of warranty; keep intact all the notices that refer to this License |
| 82 | and to the absence of any warranty; and give any other recipients of the Program |
| 83 | a copy of this License along with the Program. |
| 84 | |
| 85 | You may charge a fee for the physical act of transferring a copy, and you may at |
| 86 | your option offer warranty protection in exchange for a fee. |
| 87 | |
| 88 | **2.** You may modify your copy or copies of the Program or any portion of it, |
| 89 | thus forming a work based on the Program, and copy and distribute such |
| 90 | modifications or work under the terms of Section 1 above, provided that you also |
| 91 | meet all of these conditions: |
| 92 | |
| 93 | * **a)** You must cause the modified files to carry prominent notices stating |
| 94 | that you changed the files and the date of any change. |
| 95 | |
| 96 | * **b)** You must cause any work that you distribute or publish, that in whole |
| 97 | or in part contains or is derived from the Program or any part thereof, to |
| 98 | be licensed as a whole at no charge to all third parties under the terms of |
| 99 | this License. |
| 100 | |
| 101 | * **c)** If the modified program normally reads commands interactively when |
| 102 | run, you must cause it, when started running for such interactive use in the |
| 103 | most ordinary way, to print or display an announcement including an |
| 104 | appropriate copyright notice and a notice that there is no warranty (or |
| 105 | else, saying that you provide a warranty) and that users may redistribute |
| 106 | the program under these conditions, and telling the user how to view a copy |
| 107 | of this License. (Exception: if the Program itself is interactive but does |
| 108 | not normally print such an announcement, your work based on the Program is |
| 109 | not required to print an announcement.) |
| 110 | |
| 111 | These requirements apply to the modified work as a whole. If identifiable |
| 112 | sections of that work are not derived from the Program, and can be reasonably |
| 113 | considered independent and separate works in themselves, then this License, and |
| 114 | its terms, do not apply to those sections when you distribute them as separate |
| 115 | works. But when you distribute the same sections as part of a whole which is a |
| 116 | work based on the Program, the distribution of the whole must be on the terms of |
| 117 | this License, whose permissions for other licensees extend to the entire whole, |
| 118 | and thus to each and every part regardless of who wrote it. |
| 119 | |
| 120 | Thus, it is not the intent of this section to claim rights or contest your |
| 121 | rights to work written entirely by you; rather, the intent is to exercise the |
| 122 | right to control the distribution of derivative or collective works based on the |
| 123 | Program. |
| 124 | |
| 125 | In addition, mere aggregation of another work not based on the Program with the |
| 126 | Program (or with a work based on the Program) on a volume of a storage or |
| 127 | distribution medium does not bring the other work under the scope of this |
| 128 | License. |
| 129 | |
| 130 | **3.** You may copy and distribute the Program (or a work based on it, under |
| 131 | Section 2) in object code or executable form under the terms of Sections 1 and 2 |
| 132 | above provided that you also do one of the following: |
| 133 | |
| 134 | * **a)** Accompany it with the complete corresponding machine-readable source |
| 135 | code, which must be distributed under the terms of Sections 1 and 2 above on |
| 136 | a medium customarily used for software interchange; or, |
| 137 | |
| 138 | * **b)** Accompany it with a written offer, valid for at least three years, to |
| 139 | give any third party, for a charge no more than your cost of physically |
| 140 | performing source distribution, a complete machine-readable copy of the |
| 141 | corresponding source code, to be distributed under the terms of Sections 1 |
| 142 | and 2 above on a medium customarily used for software interchange; or, |
| 143 | |
| 144 | * **c)** Accompany it with the information you received as to the offer to |
| 145 | distribute corresponding source code. (This alternative is allowed only for |
| 146 | noncommercial distribution and only if you received the program in object |
| 147 | code or executable form with such an offer, in accord with Subsection b |
| 148 | above.) |
| 149 | |
| 150 | The source code for a work means the preferred form of the work for making |
| 151 | modifications to it. For an executable work, complete source code means all the |
| 152 | source code for all modules it contains, plus any associated interface |
| 153 | definition files, plus the scripts used to control compilation and installation |
| 154 | of the executable. However, as a special exception, the source code distributed |
| 155 | need not include anything that is normally distributed (in either source or |
| 156 | binary form) with the major components (compiler, kernel, and so on) of the |
| 157 | operating system on which the executable runs, unless that component itself |
| 158 | accompanies the executable. |
| 159 | |
| 160 | If distribution of executable or object code is made by offering access to copy |
| 161 | from a designated place, then offering equivalent access to copy the source code |
| 162 | from the same place counts as distribution of the source code, even though third |
| 163 | parties are not compelled to copy the source along with the object code. |
| 164 | |
| 165 | **4.** You may not copy, modify, sublicense, or distribute the Program except as |
| 166 | expressly provided under this License. Any attempt otherwise to copy, modify, |
| 167 | sublicense or distribute the Program is void, and will automatically terminate |
| 168 | your rights under this License. However, parties who have received copies, or |
| 169 | rights, from you under this License will not have their licenses terminated so |
| 170 | long as such parties remain in full compliance. |
| 171 | |
| 172 | **5.** You are not required to accept this License, since you have not signed |
| 173 | it. However, nothing else grants you permission to modify or distribute the |
| 174 | Program or its derivative works. These actions are prohibited by law if you do |
| 175 | not accept this License. Therefore, by modifying or distributing the Program (or |
| 176 | any work based on the Program), you indicate your acceptance of this License to |
| 177 | do so, and all its terms and conditions for copying, distributing or modifying |
| 178 | the Program or works based on it. |
| 179 | |
| 180 | **6.** Each time you redistribute the Program (or any work based on the |
| 181 | Program), the recipient automatically receives a license from the original |
| 182 | licensor to copy, distribute or modify the Program subject to these terms and |
| 183 | conditions. You may not impose any further restrictions on the recipients' |
| 184 | exercise of the rights granted herein. You are not responsible for enforcing |
| 185 | compliance by third parties to this License. |
| 186 | |
| 187 | **7.** If, as a consequence of a court judgment or allegation of patent |
| 188 | infringement or for any other reason (not limited to patent issues), conditions |
| 189 | are imposed on you (whether by court order, agreement or otherwise) that |
| 190 | contradict the conditions of this License, they do not excuse you from the |
| 191 | conditions of this License. If you cannot distribute so as to satisfy |
| 192 | simultaneously your obligations under this License and any other pertinent |
| 193 | obligations, then as a consequence you may not distribute the Program at all. |
| 194 | For example, if a patent license would not permit royalty-free redistribution of |
| 195 | the Program by all those who receive copies directly or indirectly through you, |
| 196 | then the only way you could satisfy both it and this License would be to refrain |
| 197 | entirely from distribution of the Program. |
| 198 | |
| 199 | If any portion of this section is held invalid or unenforceable under any |
| 200 | particular circumstance, the balance of the section is intended to apply and the |
| 201 | section as a whole is intended to apply in other circumstances. |
| 202 | |
| 203 | It is not the purpose of this section to induce you to infringe any patents or |
| 204 | other property right claims or to contest validity of any such claims; this |
| 205 | section has the sole purpose of protecting the integrity of the free software |
| 206 | distribution system, which is implemented by public license practices. Many |
| 207 | people have made generous contributions to the wide range of software |
| 208 | distributed through that system in reliance on consistent application of that |
| 209 | system; it is up to the author/donor to decide if he or she is willing to |
| 210 | distribute software through any other system and a licensee cannot impose that |
| 211 | choice. |
| 212 | |
| 213 | This section is intended to make thoroughly clear what is believed to be a |
| 214 | consequence of the rest of this License. |
| 215 | |
| 216 | **8.** If the distribution and/or use of the Program is restricted in certain |
| 217 | countries either by patents or by copyrighted interfaces, the original copyright |
| 218 | holder who places the Program under this License may add an explicit |
| 219 | geographical distribution limitation excluding those countries, so that |
| 220 | distribution is permitted only in or among countries not thus excluded. In such |
| 221 | case, this License incorporates the limitation as if written in the body of this |
| 222 | License. |
| 223 | |
| 224 | **9.** The Free Software Foundation may publish revised and/or new versions of |
| 225 | the General Public License from time to time. Such new versions will be similar |
| 226 | in spirit to the present version, but may differ in detail to address new |
| 227 | problems or concerns. |
| 228 | |
| 229 | Each version is given a distinguishing version number. If the Program specifies |
| 230 | a version number of this License which applies to it and "any later version", |
| 231 | you have the option of following the terms and conditions either of that version |
| 232 | or of any later version published by the Free Software Foundation. If the |
| 233 | Program does not specify a version number of this License, you may choose any |
| 234 | version ever published by the Free Software Foundation. |
| 235 | |
| 236 | **10.** If you wish to incorporate parts of the Program into other free programs |
| 237 | whose distribution conditions are different, write to the author to ask for |
| 238 | permission. For software which is copyrighted by the Free Software Foundation, |
| 239 | write to the Free Software Foundation; we sometimes make exceptions for this. |
| 240 | Our decision will be guided by the two goals of preserving the free status of |
| 241 | all derivatives of our free software and of promoting the sharing and reuse of |
| 242 | software generally. |
| 243 | |
| 244 | |
| 245 | No Warranty |
| 246 | ----------- |
| 247 | |
| 248 | **11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR |
| 249 | THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE |
| 250 | STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM |
| 251 | "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, |
| 252 | BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| 253 | PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE |
| 254 | PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF |
| 255 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
| 256 | |
| 257 | **12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
| 258 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE |
| 259 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
| 260 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR |
| 261 | INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA |
| 262 | BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
| 263 | FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER |
| 264 | OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. |