1Logos: Some pictures and logos were taken from other free sources with differing 2 licenses. In particular: 3 * The Twitter logo: <http://twitter.com/about/resources/logos> 4 <http://support.twitter.com/articles/77641-guidelines-for-use-of-the-twitter-trademark> 5 * The Identi.ca logo: <http://creativecommons.org/licenses/by/3.0/> 6 7 8 9 GNU GENERAL PUBLIC LICENSE 10 Version 2, June 1991 11 12 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 13 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 14 Everyone is permitted to copy and distribute verbatim copies 15 of this license document, but changing it is not allowed. 16 17 Preamble 18 19 The licenses for most software are designed to take away your 20freedom to share and change it. By contrast, the GNU General Public 21License is intended to guarantee your freedom to share and change free 22software--to make sure the software is free for all its users. This 23General Public License applies to most of the Free Software 24Foundation's software and to any other program whose authors commit to 25using it. (Some other Free Software Foundation software is covered by 26the GNU Library General Public License instead.) You can apply it to 27your programs, too. 28 29 When we speak of free software, we are referring to freedom, not 30price. Our General Public Licenses are designed to make sure that you 31have the freedom to distribute copies of free software (and charge for 32this service if you wish), that you receive source code or can get it 33if you want it, that you can change the software or use pieces of it 34in new free programs; and that you know you can do these things. 35 36 To protect your rights, we need to make restrictions that forbid 37anyone to deny you these rights or to ask you to surrender the rights. 38These restrictions translate to certain responsibilities for you if you 39distribute copies of the software, or if you modify it. 40 41 For example, if you distribute copies of such a program, whether 42gratis or for a fee, you must give the recipients all the rights that 43you have. You must make sure that they, too, receive or can get the 44source code. And you must show them these terms so they know their 45rights. 46 47 We protect your rights with two steps: (1) copyright the software, and 48(2) offer you this license which gives you legal permission to copy, 49distribute and/or modify the software. 50 51 Also, for each author's protection and ours, we want to make certain 52that everyone understands that there is no warranty for this free 53software. If the software is modified by someone else and passed on, we 54want its recipients to know that what they have is not the original, so 55that any problems introduced by others will not reflect on the original 56authors' reputations. 57 58 Finally, any free program is threatened constantly by software 59patents. We wish to avoid the danger that redistributors of a free 60program will individually obtain patent licenses, in effect making the 61program proprietary. To prevent this, we have made it clear that any 62patent must be licensed for everyone's free use or not licensed at all. 63 64 The precise terms and conditions for copying, distribution and 65modification follow. 66 67 GNU GENERAL PUBLIC LICENSE 68 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 69 70 0. This License applies to any program or other work which contains 71a notice placed by the copyright holder saying it may be distributed 72under the terms of this General Public License. The "Program", below, 73refers to any such program or work, and a "work based on the Program" 74means either the Program or any derivative work under copyright law: 75that is to say, a work containing the Program or a portion of it, 76either verbatim or with modifications and/or translated into another 77language. (Hereinafter, translation is included without limitation in 78the term "modification".) Each licensee is addressed as "you". 79 80Activities other than copying, distribution and modification are not 81covered by this License; they are outside its scope. The act of 82running the Program is not restricted, and the output from the Program 83is covered only if its contents constitute a work based on the 84Program (independent of having been made by running the Program). 85Whether that is true depends on what the Program does. 86 87 1. You may copy and distribute verbatim copies of the Program's 88source code as you receive it, in any medium, provided that you 89conspicuously and appropriately publish on each copy an appropriate 90copyright notice and disclaimer of warranty; keep intact all the 91notices that refer to this License and to the absence of any warranty; 92and give any other recipients of the Program a copy of this License 93along with the Program. 94 95You may charge a fee for the physical act of transferring a copy, and 96you may at your option offer warranty protection in exchange for a fee. 97 98 2. You may modify your copy or copies of the Program or any portion 99of it, thus forming a work based on the Program, and copy and 100distribute such modifications or work under the terms of Section 1 101above, provided that you also meet all of these conditions: 102 103 a) You must cause the modified files to carry prominent notices 104 stating that you changed the files and the date of any change. 105 106 b) You must cause any work that you distribute or publish, that in 107 whole or in part contains or is derived from the Program or any 108 part thereof, to be licensed as a whole at no charge to all third 109 parties under the terms of this License. 110 111 c) If the modified program normally reads commands interactively 112 when run, you must cause it, when started running for such 113 interactive use in the most ordinary way, to print or display an 114 announcement including an appropriate copyright notice and a 115 notice that there is no warranty (or else, saying that you provide 116 a warranty) and that users may redistribute the program under 117 these conditions, and telling the user how to view a copy of this 118 License. (Exception: if the Program itself is interactive but 119 does not normally print such an announcement, your work based on 120 the Program is not required to print an announcement.) 121 122These requirements apply to the modified work as a whole. If 123identifiable sections of that work are not derived from the Program, 124and can be reasonably considered independent and separate works in 125themselves, then this License, and its terms, do not apply to those 126sections when you distribute them as separate works. But when you 127distribute the same sections as part of a whole which is a work based 128on the Program, the distribution of the whole must be on the terms of 129this License, whose permissions for other licensees extend to the 130entire whole, and thus to each and every part regardless of who wrote it. 131 132Thus, it is not the intent of this section to claim rights or contest 133your rights to work written entirely by you; rather, the intent is to 134exercise the right to control the distribution of derivative or 135collective works based on the Program. 136 137In addition, mere aggregation of another work not based on the Program 138with the Program (or with a work based on the Program) on a volume of 139a storage or distribution medium does not bring the other work under 140the scope of this License. 141 142 3. You may copy and distribute the Program (or a work based on it, 143under Section 2) in object code or executable form under the terms of 144Sections 1 and 2 above provided that you also do one of the following: 145 146 a) Accompany it with the complete corresponding machine-readable 147 source code, which must be distributed under the terms of Sections 148 1 and 2 above on a medium customarily used for software interchange; or, 149 150 b) Accompany it with a written offer, valid for at least three 151 years, to give any third party, for a charge no more than your 152 cost of physically performing source distribution, a complete 153 machine-readable copy of the corresponding source code, to be 154 distributed under the terms of Sections 1 and 2 above on a medium 155 customarily used for software interchange; or, 156 157 c) Accompany it with the information you received as to the offer 158 to distribute corresponding source code. (This alternative is 159 allowed only for noncommercial distribution and only if you 160 received the program in object code or executable form with such 161 an offer, in accord with Subsection b above.) 162 163The source code for a work means the preferred form of the work for 164making modifications to it. For an executable work, complete source 165code means all the source code for all modules it contains, plus any 166associated interface definition files, plus the scripts used to 167control compilation and installation of the executable. However, as a 168special exception, the source code distributed need not include 169anything that is normally distributed (in either source or binary 170form) with the major components (compiler, kernel, and so on) of the 171operating system on which the executable runs, unless that component 172itself accompanies the executable. 173 174If distribution of executable or object code is made by offering 175access to copy from a designated place, then offering equivalent 176access to copy the source code from the same place counts as 177distribution of the source code, even though third parties are not 178compelled to copy the source along with the object code. 179 180 4. You may not copy, modify, sublicense, or distribute the Program 181except as expressly provided under this License. Any attempt 182otherwise to copy, modify, sublicense or distribute the Program is 183void, and will automatically terminate your rights under this License. 184However, parties who have received copies, or rights, from you under 185this License will not have their licenses terminated so long as such 186parties remain in full compliance. 187 188 5. You are not required to accept this License, since you have not 189signed it. However, nothing else grants you permission to modify or 190distribute the Program or its derivative works. These actions are 191prohibited by law if you do not accept this License. Therefore, by 192modifying or distributing the Program (or any work based on the 193Program), you indicate your acceptance of this License to do so, and 194all its terms and conditions for copying, distributing or modifying 195the Program or works based on it. 196 197 6. Each time you redistribute the Program (or any work based on the 198Program), the recipient automatically receives a license from the 199original licensor to copy, distribute or modify the Program subject to 200these terms and conditions. You may not impose any further 201restrictions on the recipients' exercise of the rights granted herein. 202You are not responsible for enforcing compliance by third parties to 203this License. 204 205 7. If, as a consequence of a court judgment or allegation of patent 206infringement or for any other reason (not limited to patent issues), 207conditions are imposed on you (whether by court order, agreement or 208otherwise) that contradict the conditions of this License, they do not 209excuse you from the conditions of this License. If you cannot 210distribute so as to satisfy simultaneously your obligations under this 211License and any other pertinent obligations, then as a consequence you 212may not distribute the Program at all. For example, if a patent 213license would not permit royalty-free redistribution of the Program by 214all those who receive copies directly or indirectly through you, then 215the only way you could satisfy both it and this License would be to 216refrain entirely from distribution of the Program. 217 218If any portion of this section is held invalid or unenforceable under 219any particular circumstance, the balance of the section is intended to 220apply and the section as a whole is intended to apply in other 221circumstances. 222 223It is not the purpose of this section to induce you to infringe any 224patents or other property right claims or to contest validity of any 225such claims; this section has the sole purpose of protecting the 226integrity of the free software distribution system, which is 227implemented by public license practices. Many people have made 228generous contributions to the wide range of software distributed 229through that system in reliance on consistent application of that 230system; it is up to the author/donor to decide if he or she is willing 231to distribute software through any other system and a licensee cannot 232impose that choice. 233 234This section is intended to make thoroughly clear what is believed to 235be a consequence of the rest of this License. 236 237 8. If the distribution and/or use of the Program is restricted in 238certain countries either by patents or by copyrighted interfaces, the 239original copyright holder who places the Program under this License 240may add an explicit geographical distribution limitation excluding 241those countries, so that distribution is permitted only in or among 242countries not thus excluded. In such case, this License incorporates 243the limitation as if written in the body of this License. 244 245 9. The Free Software Foundation may publish revised and/or new versions 246of the General Public License from time to time. Such new versions will 247be similar in spirit to the present version, but may differ in detail to 248address new problems or concerns. 249 250Each version is given a distinguishing version number. If the Program 251specifies a version number of this License which applies to it and "any 252later version", you have the option of following the terms and conditions 253either of that version or of any later version published by the Free 254Software Foundation. If the Program does not specify a version number of 255this License, you may choose any version ever published by the Free Software 256Foundation. 257 258 10. If you wish to incorporate parts of the Program into other free 259programs whose distribution conditions are different, write to the author 260to ask for permission. For software which is copyrighted by the Free 261Software Foundation, write to the Free Software Foundation; we sometimes 262make exceptions for this. Our decision will be guided by the two goals 263of preserving the free status of all derivatives of our free software and 264of promoting the sharing and reuse of software generally. 265 266 NO WARRANTY 267 268 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 269FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 270OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 271PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 272OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 273MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 274TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 275PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 276REPAIR OR CORRECTION. 277 278 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 279WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 280REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 281INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 282OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 283TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 284YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 285PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 286POSSIBILITY OF SUCH DAMAGES. 287 288 END OF TERMS AND CONDITIONS 289 290 How to Apply These Terms to Your New Programs 291 292 If you develop a new program, and you want it to be of the greatest 293possible use to the public, the best way to achieve this is to make it 294free software which everyone can redistribute and change under these terms. 295 296 To do so, attach the following notices to the program. It is safest 297to attach them to the start of each source file to most effectively 298convey the exclusion of warranty; and each file should have at least 299the "copyright" line and a pointer to where the full notice is found. 300 301 <one line to give the program's name and a brief idea of what it does.> 302 Copyright (C) <year> <name of author> 303 304 This program is free software; you can redistribute it and/or modify 305 it under the terms of the GNU General Public License as published by 306 the Free Software Foundation; either version 2 of the License, or 307 (at your option) any later version. 308 309 This program is distributed in the hope that it will be useful, 310 but WITHOUT ANY WARRANTY; without even the implied warranty of 311 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 312 GNU General Public License for more details. 313 314 You should have received a copy of the GNU General Public License 315 along with this program; if not, write to the Free Software 316 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 317 318 319Also add information on how to contact you by electronic and paper mail. 320 321If the program is interactive, make it output a short notice like this 322when it starts in an interactive mode: 323 324 Gnomovision version 69, Copyright (C) year name of author 325 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 326 This is free software, and you are welcome to redistribute it 327 under certain conditions; type `show c' for details. 328 329The hypothetical commands `show w' and `show c' should show the appropriate 330parts of the General Public License. Of course, the commands you use may 331be called something other than `show w' and `show c'; they could even be 332mouse-clicks or menu items--whatever suits your program. 333 334You should also get your employer (if you work as a programmer) or your 335school, if any, to sign a "copyright disclaimer" for the program, if 336necessary. Here is a sample; alter the names: 337 338 Yoyodyne, Inc., hereby disclaims all copyright interest in the program 339 `Gnomovision' (which makes passes at compilers) written by James Hacker. 340 341 <signature of Ty Coon>, 1 April 1989 342 Ty Coon, President of Vice 343 344This General Public License does not permit incorporating your program into 345proprietary programs. If your program is a subroutine library, you may 346consider it more useful to permit linking proprietary applications with the 347library. If this is what you want to do, use the GNU Library General 348Public License instead of this License. 349