| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | The GNU General Public License (GPL) | 
|  | 2 |  | 
|  | 3 | Version 2, June 1991 | 
|  | 4 |  | 
|  | 5 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. | 
|  | 6 | 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | 
|  | 7 |  | 
|  | 8 | Everyone is permitted to copy and distribute verbatim copies | 
|  | 9 | of this license document, but changing it is not allowed. | 
|  | 10 |  | 
|  | 11 | Preamble | 
|  | 12 |  | 
|  | 13 | The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU | 
|  | 14 | General Public License is intended to guarantee your freedom to share and change free software--to make sure the | 
|  | 15 | software is free for all its users. This General Public License applies to most of the Free Software Foundation's | 
|  | 16 | software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is | 
|  | 17 | covered by the GNU Library General Public License instead.) You can apply it to your programs, too. | 
|  | 18 |  | 
|  | 19 | When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make | 
|  | 20 | sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you | 
|  | 21 | receive source code or can get it if you want it, that you can change the software or use pieces of it in new free | 
|  | 22 | programs; and that you know you can do these things. | 
|  | 23 |  | 
|  | 24 | To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to | 
|  | 25 | surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the | 
|  | 26 | software, or if you modify it. | 
|  | 27 |  | 
|  | 28 | For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all | 
|  | 29 | the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them | 
|  | 30 | these terms so they know their rights. | 
|  | 31 |  | 
|  | 32 | We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal | 
|  | 33 | permission to copy, distribute and/or modify the software. | 
|  | 34 |  | 
|  | 35 | Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty | 
|  | 36 | for this free software. If the software is modified by someone else and passed on, we want its recipients to know that | 
|  | 37 | what they have is not the original, so that any problems introduced by others will not reflect on the original authors' | 
|  | 38 | reputations. | 
|  | 39 |  | 
|  | 40 | Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors | 
|  | 41 | of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, | 
|  | 42 | we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. | 
|  | 43 |  | 
|  | 44 | The precise terms and conditions for copying, distribution and modification follow. | 
|  | 45 |  | 
|  | 46 | TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | 
|  | 47 |  | 
|  | 48 | 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it | 
|  | 49 | may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or | 
|  | 50 | work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to | 
|  | 51 | say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into | 
|  | 52 | another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is | 
|  | 53 | addressed as "you". | 
|  | 54 |  | 
|  | 55 | Activities other than copying, distribution and modification are not covered by this License; they are outside its | 
|  | 56 | scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents | 
|  | 57 | constitute a work based on the Program (independent of having been made by running the Program). Whether that is true | 
|  | 58 | depends on what the Program does. | 
|  | 59 |  | 
|  | 60 | 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided | 
|  | 61 | that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of | 
|  | 62 | warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other | 
|  | 63 | recipients of the Program a copy of this License along with the Program. | 
|  | 64 |  | 
|  | 65 | You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection | 
|  | 66 | in exchange for a fee. | 
|  | 67 |  | 
|  | 68 | 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and | 
|  | 69 | copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of | 
|  | 70 | these conditions: | 
|  | 71 |  | 
|  | 72 | a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any | 
|  | 73 | change. | 
|  | 74 |  | 
|  | 75 | b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the | 
|  | 76 | Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this | 
|  | 77 | License. | 
|  | 78 |  | 
|  | 79 | c) If the modified program normally reads commands interactively when run, you must cause it, when started running for | 
|  | 80 | such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright | 
|  | 81 | notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may | 
|  | 82 | redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if | 
|  | 83 | the Program itself is interactive but does not normally print such an announcement, your work based on the Program is | 
|  | 84 | not required to print an announcement.) | 
|  | 85 |  | 
|  | 86 | These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the | 
|  | 87 | Program, and can be reasonably considered independent and separate works in themselves, then this License, and its | 
|  | 88 | terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same | 
|  | 89 | sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of | 
|  | 90 | this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part | 
|  | 91 | regardless of who wrote it. | 
|  | 92 |  | 
|  | 93 | Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; | 
|  | 94 | rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the | 
|  | 95 | Program. | 
|  | 96 |  | 
|  | 97 | In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the | 
|  | 98 | Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. | 
|  | 99 |  | 
|  | 100 | 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form | 
|  | 101 | under the terms of Sections 1 and 2 above provided that you also do one of the following: | 
|  | 102 |  | 
|  | 103 | a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms | 
|  | 104 | of Sections 1 and 2 above on a medium customarily used for software interchange; or, | 
|  | 105 |  | 
|  | 106 | b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than | 
|  | 107 | your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source | 
|  | 108 | code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; | 
|  | 109 | or, | 
|  | 110 |  | 
|  | 111 | c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This | 
|  | 112 | alternative is allowed only for noncommercial distribution and only if you received the program in object code or | 
|  | 113 | executable form with such an offer, in accord with Subsection b above.) | 
|  | 114 |  | 
|  | 115 | The source code for a work means the preferred form of the work for making modifications to it. For an executable work, | 
|  | 116 | complete source code means all the source code for all modules it contains, plus any associated interface definition | 
|  | 117 | files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, | 
|  | 118 | the source code distributed need not include anything that is normally distributed (in either source or binary form) | 
|  | 119 | with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless | 
|  | 120 | that component itself accompanies the executable. | 
|  | 121 |  | 
|  | 122 | If distribution of executable or object code is made by offering access to copy from a designated place, then offering | 
|  | 123 | equivalent access to copy the source code from the same place counts as distribution of the source code, even though | 
|  | 124 | third parties are not compelled to copy the source along with the object code. | 
|  | 125 |  | 
|  | 126 | 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any | 
|  | 127 | attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your | 
|  | 128 | rights under this License. However, parties who have received copies, or rights, from you under this License will not | 
|  | 129 | have their licenses terminated so long as such parties remain in full compliance. | 
|  | 130 |  | 
|  | 131 | 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you | 
|  | 132 | permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do | 
|  | 133 | not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you | 
|  | 134 | indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or | 
|  | 135 | modifying the Program or works based on it. | 
|  | 136 |  | 
|  | 137 | 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a | 
|  | 138 | license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You | 
|  | 139 | may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not | 
|  | 140 | responsible for enforcing compliance by third parties to this License. | 
|  | 141 |  | 
|  | 142 | 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to | 
|  | 143 | patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the | 
|  | 144 | conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as | 
|  | 145 | to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence | 
|  | 146 | you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution | 
|  | 147 | of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy | 
|  | 148 | both it and this License would be to refrain entirely from distribution of the Program. | 
|  | 149 |  | 
|  | 150 | If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the | 
|  | 151 | section is intended to apply and the section as a whole is intended to apply in other circumstances. | 
|  | 152 |  | 
|  | 153 | It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest | 
|  | 154 | validity of any such claims; this section has the sole purpose of protecting the integrity of the free software | 
|  | 155 | distribution system, which is implemented by public license practices. Many people have made generous contributions to | 
|  | 156 | the wide range of software distributed through that system in reliance on consistent application of that system; it is | 
|  | 157 | up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee | 
|  | 158 | cannot impose that choice. | 
|  | 159 |  | 
|  | 160 | This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. | 
|  | 161 |  | 
|  | 162 | 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted | 
|  | 163 | interfaces, the original copyright holder who places the Program under this License may add an explicit geographical | 
|  | 164 | distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus | 
|  | 165 | excluded. In such case, this License incorporates the limitation as if written in the body of this License. | 
|  | 166 |  | 
|  | 167 | 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. | 
|  | 168 | Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or | 
|  | 169 | concerns. | 
|  | 170 |  | 
|  | 171 | Each version is given a distinguishing version number. If the Program specifies a version number of this License which | 
|  | 172 | applies to it and "any later version", you have the option of following the terms and conditions either of that version | 
|  | 173 | or of any later version published by the Free Software Foundation. If the Program does not specify a version number of | 
|  | 174 | this License, you may choose any version ever published by the Free Software Foundation. | 
|  | 175 |  | 
|  | 176 | 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are | 
|  | 177 | different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, | 
|  | 178 | write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two | 
|  | 179 | goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of | 
|  | 180 | software generally. | 
|  | 181 |  | 
|  | 182 | NO WARRANTY | 
|  | 183 |  | 
|  | 184 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY | 
|  | 185 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM | 
|  | 186 | "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | 
|  | 187 | OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE | 
|  | 188 | PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR | 
|  | 189 | CORRECTION. | 
|  | 190 |  | 
|  | 191 | 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY | 
|  | 192 | WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, | 
|  | 193 | SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT | 
|  | 194 | LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF | 
|  | 195 | THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY | 
|  | 196 | OF SUCH DAMAGES. | 
|  | 197 |  | 
|  | 198 | END OF TERMS AND CONDITIONS | 
|  | 199 |  | 
|  | 200 |  | 
|  | 201 |  | 
|  | 202 |  |