1***************************************************************************** 2The text that follows is the GNU General Public License, Version 2 (GPL V2) 3and governs your use, modification and/or distribution of SNORT. 4 5Section 9 of the GPL V2 acknowledges that the Free Software Foundation may 6publish revised and/or new versions of the GPL V2 from time to time. Section 9 7further states that a licensee of a program subject to the GPL V2 could be 8free to use any such revised and/or new versions under two different scenarios: 9 101. "Failure to Specify." Section 9 of the GPL V2 allows a licensee of a 11program governed by an unspecified version of the General Public License to 12choose any version of the General Public License ever published by the Free 13Software Foundation to govern his or her use of such program. 14 15This provision is not applicable to your use of SNORT because we have 16expressly stated in a number of instances that any third party's use, 17modification or distribution of SNORT is governed by GPL V2. 18 192. "Any Later Version." At the end of the terms and condition of the GPL V2 is 20a section called "How to Apply these Terms to Your New Program," which 21provides guidance to a developer on how to apply the GPL V2 to a third party's 22use, modification and/or distribution of his/her program. Among other things, 23this guidance suggests that the developer attach certain notices to the 24program. Of particular importance is the following notice: 25 26"This program is free software; you can redistribute it and/or modify it under 27the terms of the GNU General Public License as published by the Free Software 28Foundation; either version 2 of the License, or (at your option) any later 29version." 30 31Thus if a developer follows strictly the guidance provided by the Free 32Software Foundation, Section 9 of the GPL V2 provides the licensee the option 33to either use, modify or distribute the program under GPL V2 or under any 34later version published by the Free Software Foundation. 35 36SNORT is an open source project that is governed exclusively by the GPL V2 37and any third party desiring to use, modify or distribute SNORT must do so by 38strictly following the terms and conditions of GPL V2. Anyone using, modifying 39or distributing SNORT does not have the option to chose to use, modify or 40distribute SNORT under any revised or new version of the GPL, including 41without limitation, the GNU General Public License Version 3. 42 43For ease of reference, the comparable notice that is used with SNORT 44(contained in the 'README' file) is as follows: 45 46"This program is free software; you can redistribute it and/or modify it under 47the terms of the GNU General Public License Version 2 as published by the Free 48Software Foundation. You may not use, modify or distribute this program under 49any other version of the GNU General Public License." 50 51If you have any questions about this statement, please feel free to email 52snort-info@snort.org. 53***************************************************************************** 54 55 GNU GENERAL PUBLIC LICENSE 56 Version 2, June 1991 57 58 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 60 Everyone is permitted to copy and distribute verbatim copies 61 of this license document, but changing it is not allowed. 62 63 Preamble 64 65 The licenses for most software are designed to take away your 66freedom to share and change it. By contrast, the GNU General Public 67License is intended to guarantee your freedom to share and change free 68software--to make sure the software is free for all its users. This 69General Public License applies to most of the Free Software 70Foundation's software and to any other program whose authors commit to 71using it. (Some other Free Software Foundation software is covered by 72the GNU Library General Public License instead.) You can apply it to 73your programs, too. 74 75 When we speak of free software, we are referring to freedom, not 76price. Our General Public Licenses are designed to make sure that you 77have the freedom to distribute copies of free software (and charge for 78this service if you wish), that you receive source code or can get it 79if you want it, that you can change the software or use pieces of it 80in new free programs; and that you know you can do these things. 81 82 To protect your rights, we need to make restrictions that forbid 83anyone to deny you these rights or to ask you to surrender the rights. 84These restrictions translate to certain responsibilities for you if you 85distribute copies of the software, or if you modify it. 86 87 For example, if you distribute copies of such a program, whether 88gratis or for a fee, you must give the recipients all the rights that 89you have. You must make sure that they, too, receive or can get the 90source code. And you must show them these terms so they know their 91rights. 92 93 We protect your rights with two steps: (1) copyright the software, and 94(2) offer you this license which gives you legal permission to copy, 95distribute and/or modify the software. 96 97 Also, for each author's protection and ours, we want to make certain 98that everyone understands that there is no warranty for this free 99software. If the software is modified by someone else and passed on, we 100want its recipients to know that what they have is not the original, so 101that any problems introduced by others will not reflect on the original 102authors' reputations. 103 104 Finally, any free program is threatened constantly by software 105patents. We wish to avoid the danger that redistributors of a free 106program will individually obtain patent licenses, in effect making the 107program proprietary. To prevent this, we have made it clear that any 108patent must be licensed for everyone's free use or not licensed at all. 109 110 The precise terms and conditions for copying, distribution and 111modification follow. 112 113 GNU GENERAL PUBLIC LICENSE 114 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 115 116 0. This License applies to any program or other work which contains 117a notice placed by the copyright holder saying it may be distributed 118under the terms of this General Public License. The "Program", below, 119refers to any such program or work, and a "work based on the Program" 120means either the Program or any derivative work under copyright law: 121that is to say, a work containing the Program or a portion of it, 122either verbatim or with modifications and/or translated into another 123language. (Hereinafter, translation is included without limitation in 124the term "modification".) Each licensee is addressed as "you". 125 126Activities other than copying, distribution and modification are not 127covered by this License; they are outside its scope. The act of 128running the Program is not restricted, and the output from the Program 129is covered only if its contents constitute a work based on the 130Program (independent of having been made by running the Program). 131Whether that is true depends on what the Program does. 132 133 1. You may copy and distribute verbatim copies of the Program's 134source code as you receive it, in any medium, provided that you 135conspicuously and appropriately publish on each copy an appropriate 136copyright notice and disclaimer of warranty; keep intact all the 137notices that refer to this License and to the absence of any warranty; 138and give any other recipients of the Program a copy of this License 139along with the Program. 140 141You may charge a fee for the physical act of transferring a copy, and 142you may at your option offer warranty protection in exchange for a fee. 143 144 2. You may modify your copy or copies of the Program or any portion 145of it, thus forming a work based on the Program, and copy and 146distribute such modifications or work under the terms of Section 1 147above, provided that you also meet all of these conditions: 148 149 a) You must cause the modified files to carry prominent notices 150 stating that you changed the files and the date of any change. 151 152 b) You must cause any work that you distribute or publish, that in 153 whole or in part contains or is derived from the Program or any 154 part thereof, to be licensed as a whole at no charge to all third 155 parties under the terms of this License. 156 157 c) If the modified program normally reads commands interactively 158 when run, you must cause it, when started running for such 159 interactive use in the most ordinary way, to print or display an 160 announcement including an appropriate copyright notice and a 161 notice that there is no warranty (or else, saying that you provide 162 a warranty) and that users may redistribute the program under 163 these conditions, and telling the user how to view a copy of this 164 License. (Exception: if the Program itself is interactive but 165 does not normally print such an announcement, your work based on 166 the Program is not required to print an announcement.) 167 168These requirements apply to the modified work as a whole. If 169identifiable sections of that work are not derived from the Program, 170and can be reasonably considered independent and separate works in 171themselves, then this License, and its terms, do not apply to those 172sections when you distribute them as separate works. But when you 173distribute the same sections as part of a whole which is a work based 174on the Program, the distribution of the whole must be on the terms of 175this License, whose permissions for other licensees extend to the 176entire whole, and thus to each and every part regardless of who wrote it. 177 178Thus, it is not the intent of this section to claim rights or contest 179your rights to work written entirely by you; rather, the intent is to 180exercise the right to control the distribution of derivative or 181collective works based on the Program. 182 183In addition, mere aggregation of another work not based on the Program 184with the Program (or with a work based on the Program) on a volume of 185a storage or distribution medium does not bring the other work under 186the scope of this License. 187 188 3. You may copy and distribute the Program (or a work based on it, 189under Section 2) in object code or executable form under the terms of 190Sections 1 and 2 above provided that you also do one of the following: 191 192 a) Accompany it with the complete corresponding machine-readable 193 source code, which must be distributed under the terms of Sections 194 1 and 2 above on a medium customarily used for software interchange; or, 195 196 b) Accompany it with a written offer, valid for at least three 197 years, to give any third party, for a charge no more than your 198 cost of physically performing source distribution, a complete 199 machine-readable copy of the corresponding source code, to be 200 distributed under the terms of Sections 1 and 2 above on a medium 201 customarily used for software interchange; or, 202 203 c) Accompany it with the information you received as to the offer 204 to distribute corresponding source code. (This alternative is 205 allowed only for noncommercial distribution and only if you 206 received the program in object code or executable form with such 207 an offer, in accord with Subsection b above.) 208 209The source code for a work means the preferred form of the work for 210making modifications to it. For an executable work, complete source 211code means all the source code for all modules it contains, plus any 212associated interface definition files, plus the scripts used to 213control compilation and installation of the executable. However, as a 214special exception, the source code distributed need not include 215anything that is normally distributed (in either source or binary 216form) with the major components (compiler, kernel, and so on) of the 217operating system on which the executable runs, unless that component 218itself accompanies the executable. 219 220If distribution of executable or object code is made by offering 221access to copy from a designated place, then offering equivalent 222access to copy the source code from the same place counts as 223distribution of the source code, even though third parties are not 224compelled to copy the source along with the object code. 225 226 4. You may not copy, modify, sublicense, or distribute the Program 227except as expressly provided under this License. Any attempt 228otherwise to copy, modify, sublicense or distribute the Program is 229void, and will automatically terminate your rights under this License. 230However, parties who have received copies, or rights, from you under 231this License will not have their licenses terminated so long as such 232parties remain in full compliance. 233 234 5. You are not required to accept this License, since you have not 235signed it. However, nothing else grants you permission to modify or 236distribute the Program or its derivative works. These actions are 237prohibited by law if you do not accept this License. Therefore, by 238modifying or distributing the Program (or any work based on the 239Program), you indicate your acceptance of this License to do so, and 240all its terms and conditions for copying, distributing or modifying 241the Program or works based on it. 242 243 6. Each time you redistribute the Program (or any work based on the 244Program), the recipient automatically receives a license from the 245original licensor to copy, distribute or modify the Program subject to 246these terms and conditions. You may not impose any further 247restrictions on the recipients' exercise of the rights granted herein. 248You are not responsible for enforcing compliance by third parties to 249this License. 250 251 7. If, as a consequence of a court judgment or allegation of patent 252infringement or for any other reason (not limited to patent issues), 253conditions are imposed on you (whether by court order, agreement or 254otherwise) that contradict the conditions of this License, they do not 255excuse you from the conditions of this License. If you cannot 256distribute so as to satisfy simultaneously your obligations under this 257License and any other pertinent obligations, then as a consequence you 258may not distribute the Program at all. For example, if a patent 259license would not permit royalty-free redistribution of the Program by 260all those who receive copies directly or indirectly through you, then 261the only way you could satisfy both it and this License would be to 262refrain entirely from distribution of the Program. 263 264If any portion of this section is held invalid or unenforceable under 265any particular circumstance, the balance of the section is intended to 266apply and the section as a whole is intended to apply in other 267circumstances. 268 269It is not the purpose of this section to induce you to infringe any 270patents or other property right claims or to contest validity of any 271such claims; this section has the sole purpose of protecting the 272integrity of the free software distribution system, which is 273implemented by public license practices. Many people have made 274generous contributions to the wide range of software distributed 275through that system in reliance on consistent application of that 276system; it is up to the author/donor to decide if he or she is willing 277to distribute software through any other system and a licensee cannot 278impose that choice. 279 280This section is intended to make thoroughly clear what is believed to 281be a consequence of the rest of this License. 282 283 8. If the distribution and/or use of the Program is restricted in 284certain countries either by patents or by copyrighted interfaces, the 285original copyright holder who places the Program under this License 286may add an explicit geographical distribution limitation excluding 287those countries, so that distribution is permitted only in or among 288countries not thus excluded. In such case, this License incorporates 289the limitation as if written in the body of this License. 290 291 9. The Free Software Foundation may publish revised and/or new versions 292of the General Public License from time to time. Such new versions will 293be similar in spirit to the present version, but may differ in detail to 294address new problems or concerns. 295 296Each version is given a distinguishing version number. If the Program 297specifies a version number of this License which applies to it and "any 298later version", you have the option of following the terms and conditions 299either of that version or of any later version published by the Free 300Software Foundation. If the Program does not specify a version number of 301this License, you may choose any version ever published by the Free Software 302Foundation. 303 304 10. If you wish to incorporate parts of the Program into other free 305programs whose distribution conditions are different, write to the author 306to ask for permission. For software which is copyrighted by the Free 307Software Foundation, write to the Free Software Foundation; we sometimes 308make exceptions for this. Our decision will be guided by the two goals 309of preserving the free status of all derivatives of our free software and 310of promoting the sharing and reuse of software generally. 311 312 NO WARRANTY 313 314 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 315FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 316OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 317PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 318OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 319MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 320TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 321PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 322REPAIR OR CORRECTION. 323 324 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 325WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 326REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 327INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 328OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 329TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 330YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 331PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 332POSSIBILITY OF SUCH DAMAGES. 333 334 END OF TERMS AND CONDITIONS 335 336 How to Apply These Terms to Your New Programs 337 338 If you develop a new program, and you want it to be of the greatest 339possible use to the public, the best way to achieve this is to make it 340free software which everyone can redistribute and change under these terms. 341 342 To do so, attach the following notices to the program. It is safest 343to attach them to the start of each source file to most effectively 344convey the exclusion of warranty; and each file should have at least 345the "copyright" line and a pointer to where the full notice is found. 346 347 <one line to give the program's name and a brief idea of what it does.> 348 Copyright (C) 19yy <name of author> 349 350 This program is free software; you can redistribute it and/or modify 351 it under the terms of the GNU General Public License as published by 352 the Free Software Foundation; either version 2 of the License, or 353 (at your option) any later version. 354 355 This program is distributed in the hope that it will be useful, 356 but WITHOUT ANY WARRANTY; without even the implied warranty of 357 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 358 GNU General Public License for more details. 359 360 You should have received a copy of the GNU General Public License 361 along with this program; if not, write to the Free Software 362 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 363 364 365Also add information on how to contact you by electronic and paper mail. 366 367If the program is interactive, make it output a short notice like this 368when it starts in an interactive mode: 369 370 Gnomovision version 69, Copyright (C) 19yy name of author 371 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 372 This is free software, and you are welcome to redistribute it 373 under certain conditions; type `show c' for details. 374 375The hypothetical commands `show w' and `show c' should show the appropriate 376parts of the General Public License. Of course, the commands you use may 377be called something other than `show w' and `show c'; they could even be 378mouse-clicks or menu items--whatever suits your program. 379 380You should also get your employer (if you work as a programmer) or your 381school, if any, to sign a "copyright disclaimer" for the program, if 382necessary. Here is a sample; alter the names: 383 384 Yoyodyne, Inc., hereby disclaims all copyright interest in the program 385 `Gnomovision' (which makes passes at compilers) written by James Hacker. 386 387 <signature of Ty Coon>, 1 April 1989 388 Ty Coon, President of Vice 389 390This General Public License does not permit incorporating your program into 391proprietary programs. If your program is a subroutine library, you may 392consider it more useful to permit linking proprietary applications with the 393library. If this is what you want to do, use the GNU Library General 394Public License instead of this License. 395