1 GNU GENERAL PUBLIC LICENSE 2 Version 2, June 1991 3 4 Copyright (C) 1989, 1991 Free Software Foundation, Inc. <https://fsf.org/> 5 Everyone is permitted to copy and distribute verbatim copies 6 of this license document, but changing it is not allowed. 7 8 Preamble 9 10 The licenses for most software are designed to take away your 11freedom to share and change it. By contrast, the GNU General Public 12License is intended to guarantee your freedom to share and change free 13software--to make sure the software is free for all its users. This 14General Public License applies to most of the Free Software 15Foundation's software and to any other program whose authors commit to 16using it. (Some other Free Software Foundation software is covered by 17the GNU Library General Public License instead.) You can apply it to 18your programs, too. 19 20 When we speak of free software, we are referring to freedom, not 21price. Our General Public Licenses are designed to make sure that you 22have the freedom to distribute copies of free software (and charge for 23this service if you wish), that you receive source code or can get it 24if you want it, that you can change the software or use pieces of it 25in new free programs; and that you know you can do these things. 26 27 To protect your rights, we need to make restrictions that forbid 28anyone to deny you these rights or to ask you to surrender the rights. 29These restrictions translate to certain responsibilities for you if you 30distribute copies of the software, or if you modify it. 31 32 For example, if you distribute copies of such a program, whether 33gratis or for a fee, you must give the recipients all the rights that 34you have. You must make sure that they, too, receive or can get the 35source code. And you must show them these terms so they know their 36rights. 37 38 We protect your rights with two steps: (1) copyright the software, and 39(2) offer you this license which gives you legal permission to copy, 40distribute and/or modify the software. 41 42 Also, for each author's protection and ours, we want to make certain 43that everyone understands that there is no warranty for this free 44software. If the software is modified by someone else and passed on, we 45want its recipients to know that what they have is not the original, so 46that any problems introduced by others will not reflect on the original 47authors' reputations. 48 49 Finally, any free program is threatened constantly by software 50patents. We wish to avoid the danger that redistributors of a free 51program will individually obtain patent licenses, in effect making the 52program proprietary. To prevent this, we have made it clear that any 53patent must be licensed for everyone's free use or not licensed at all. 54 55 The precise terms and conditions for copying, distribution and 56modification follow. 57 58 GNU GENERAL PUBLIC LICENSE 59 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 60 61 0. This License applies to any program or other work which contains 62a notice placed by the copyright holder saying it may be distributed 63under the terms of this General Public License. The "Program", below, 64refers to any such program or work, and a "work based on the Program" 65means either the Program or any derivative work under copyright law: 66that is to say, a work containing the Program or a portion of it, 67either verbatim or with modifications and/or translated into another 68language. (Hereinafter, translation is included without limitation in 69the term "modification".) Each licensee is addressed as "you". 70 71Activities other than copying, distribution and modification are not 72covered by this License; they are outside its scope. The act of 73running the Program is not restricted, and the output from the Program 74is covered only if its contents constitute a work based on the 75Program (independent of having been made by running the Program). 76Whether that is true depends on what the Program does. 77 78 1. You may copy and distribute verbatim copies of the Program's 79source code as you receive it, in any medium, provided that you 80conspicuously and appropriately publish on each copy an appropriate 81copyright notice and disclaimer of warranty; keep intact all the 82notices that refer to this License and to the absence of any warranty; 83and give any other recipients of the Program a copy of this License 84along with the Program. 85 86You may charge a fee for the physical act of transferring a copy, and 87you may at your option offer warranty protection in exchange for a fee. 88 89 2. You may modify your copy or copies of the Program or any portion 90of it, thus forming a work based on the Program, and copy and 91distribute such modifications or work under the terms of Section 1 92above, provided that you also meet all of these conditions: 93 94 a) You must cause the modified files to carry prominent notices 95 stating that you changed the files and the date of any change. 96 97 b) You must cause any work that you distribute or publish, that in 98 whole or in part contains or is derived from the Program or any 99 part thereof, to be licensed as a whole at no charge to all third 100 parties under the terms of this License. 101 102 c) If the modified program normally reads commands interactively 103 when run, you must cause it, when started running for such 104 interactive use in the most ordinary way, to print or display an 105 announcement including an appropriate copyright notice and a 106 notice that there is no warranty (or else, saying that you provide 107 a warranty) and that users may redistribute the program under 108 these conditions, and telling the user how to view a copy of this 109 License. (Exception: if the Program itself is interactive but 110 does not normally print such an announcement, your work based on 111 the Program is not required to print an announcement.) 112 113These requirements apply to the modified work as a whole. If 114identifiable sections of that work are not derived from the Program, 115and can be reasonably considered independent and separate works in 116themselves, then this License, and its terms, do not apply to those 117sections when you distribute them as separate works. But when you 118distribute the same sections as part of a whole which is a work based 119on the Program, the distribution of the whole must be on the terms of 120this License, whose permissions for other licensees extend to the 121entire whole, and thus to each and every part regardless of who wrote it. 122 123Thus, it is not the intent of this section to claim rights or contest 124your rights to work written entirely by you; rather, the intent is to 125exercise the right to control the distribution of derivative or 126collective works based on the Program. 127 128In addition, mere aggregation of another work not based on the Program 129with the Program (or with a work based on the Program) on a volume of 130a storage or distribution medium does not bring the other work under 131the scope of this License. 132 133 3. You may copy and distribute the Program (or a work based on it, 134under Section 2) in object code or executable form under the terms of 135Sections 1 and 2 above provided that you also do one of the following: 136 137 a) Accompany it with the complete corresponding machine-readable 138 source code, which must be distributed under the terms of Sections 139 1 and 2 above on a medium customarily used for software interchange; or, 140 141 b) Accompany it with a written offer, valid for at least three 142 years, to give any third party, for a charge no more than your 143 cost of physically performing source distribution, a complete 144 machine-readable copy of the corresponding source code, to be 145 distributed under the terms of Sections 1 and 2 above on a medium 146 customarily used for software interchange; or, 147 148 c) Accompany it with the information you received as to the offer 149 to distribute corresponding source code. (This alternative is 150 allowed only for noncommercial distribution and only if you 151 received the program in object code or executable form with such 152 an offer, in accord with Subsection b above.) 153 154The source code for a work means the preferred form of the work for 155making modifications to it. For an executable work, complete source 156code means all the source code for all modules it contains, plus any 157associated interface definition files, plus the scripts used to 158control compilation and installation of the executable. However, as a 159special exception, the source code distributed need not include 160anything that is normally distributed (in either source or binary 161form) with the major components (compiler, kernel, and so on) of the 162operating system on which the executable runs, unless that component 163itself accompanies the executable. 164 165If distribution of executable or object code is made by offering 166access to copy from a designated place, then offering equivalent 167access to copy the source code from the same place counts as 168distribution of the source code, even though third parties are not 169compelled to copy the source along with the object code. 170 171 4. You may not copy, modify, sublicense, or distribute the Program 172except as expressly provided under this License. Any attempt 173otherwise to copy, modify, sublicense or distribute the Program is 174void, and will automatically terminate your rights under this License. 175However, parties who have received copies, or rights, from you under 176this License will not have their licenses terminated so long as such 177parties remain in full compliance. 178 179 5. You are not required to accept this License, since you have not 180signed it. However, nothing else grants you permission to modify or 181distribute the Program or its derivative works. These actions are 182prohibited by law if you do not accept this License. Therefore, by 183modifying or distributing the Program (or any work based on the 184Program), you indicate your acceptance of this License to do so, and 185all its terms and conditions for copying, distributing or modifying 186the Program or works based on it. 187 188 6. Each time you redistribute the Program (or any work based on the 189Program), the recipient automatically receives a license from the 190original licensor to copy, distribute or modify the Program subject to 191these terms and conditions. You may not impose any further 192restrictions on the recipients' exercise of the rights granted herein. 193You are not responsible for enforcing compliance by third parties to 194this License. 195 196 7. If, as a consequence of a court judgment or allegation of patent 197infringement or for any other reason (not limited to patent issues), 198conditions are imposed on you (whether by court order, agreement or 199otherwise) that contradict the conditions of this License, they do not 200excuse you from the conditions of this License. If you cannot 201distribute so as to satisfy simultaneously your obligations under this 202License and any other pertinent obligations, then as a consequence you 203may not distribute the Program at all. For example, if a patent 204license would not permit royalty-free redistribution of the Program by 205all those who receive copies directly or indirectly through you, then 206the only way you could satisfy both it and this License would be to 207refrain entirely from distribution of the Program. 208 209If any portion of this section is held invalid or unenforceable under 210any particular circumstance, the balance of the section is intended to 211apply and the section as a whole is intended to apply in other 212circumstances. 213 214It is not the purpose of this section to induce you to infringe any 215patents or other property right claims or to contest validity of any 216such claims; this section has the sole purpose of protecting the 217integrity of the free software distribution system, which is 218implemented by public license practices. Many people have made 219generous contributions to the wide range of software distributed 220through that system in reliance on consistent application of that 221system; it is up to the author/donor to decide if he or she is willing 222to distribute software through any other system and a licensee cannot 223impose that choice. 224 225This section is intended to make thoroughly clear what is believed to 226be a consequence of the rest of this License. 227 228 8. If the distribution and/or use of the Program is restricted in 229certain countries either by patents or by copyrighted interfaces, the 230original copyright holder who places the Program under this License 231may add an explicit geographical distribution limitation excluding 232those countries, so that distribution is permitted only in or among 233countries not thus excluded. In such case, this License incorporates 234the limitation as if written in the body of this License. 235 236 9. The Free Software Foundation may publish revised and/or new versions 237of the General Public License from time to time. Such new versions will 238be similar in spirit to the present version, but may differ in detail to 239address new problems or concerns. 240 241Each version is given a distinguishing version number. If the Program 242specifies a version number of this License which applies to it and "any 243later version", you have the option of following the terms and conditions 244either of that version or of any later version published by the Free 245Software Foundation. If the Program does not specify a version number of 246this License, you may choose any version ever published by the Free Software 247Foundation. 248 249 10. If you wish to incorporate parts of the Program into other free 250programs whose distribution conditions are different, write to the author 251to ask for permission. For software which is copyrighted by the Free 252Software Foundation, write to the Free Software Foundation; we sometimes 253make exceptions for this. Our decision will be guided by the two goals 254of preserving the free status of all derivatives of our free software and 255of promoting the sharing and reuse of software generally. 256 257 NO WARRANTY 258 259 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 260FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 261OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 262PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 263OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 264MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 265TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 266PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 267REPAIR OR CORRECTION. 268 269 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 270WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 271REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 272INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 273OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 274TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 275YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 276PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 277POSSIBILITY OF SUCH DAMAGES. 278 279 END OF TERMS AND CONDITIONS 280