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    1 *****************************************************************************
    2 The text that follows is the GNU General Public License, Version 2 (GPL V2)
    3 and governs your use, modification and/or distribution of SNORT.
    4 
    5 Section 9 of the GPL V2 acknowledges that the Free Software Foundation may
    6 publish revised and/or new versions of the GPL V2 from time to time.  Section 9
    7 further states that a licensee of a program subject to the GPL V2 could be
    8 free to use any such revised and/or new versions under two different scenarios:
    9 
   10 1. "Failure to Specify." Section 9 of the GPL V2 allows a licensee of a
   11 program governed by an unspecified version of the General Public License to
   12 choose any version of the General Public License ever published by the Free
   13 Software Foundation to govern his or her use of such program.
   14 
   15 This provision is not applicable to your use of SNORT because we have
   16 expressly stated in a number of instances that any third party's use,
   17 modification or distribution of SNORT is governed by GPL V2.
   18 
   19 2. "Any Later Version." At the end of the terms and condition of the GPL V2 is
   20 a section called "How to Apply these Terms to Your New Program," which
   21 provides guidance to a developer on how to apply the GPL V2 to a third party's
   22 use, modification and/or distribution of his/her program. Among other things,
   23 this guidance suggests that the developer attach certain notices to the
   24 program. Of particular importance is the following notice:
   25 
   26 "This program is free software; you can redistribute it and/or modify it under
   27 the terms of the GNU General Public License as published by the Free Software
   28 Foundation; either version 2 of the License, or (at your option) any later
   29 version."
   30 
   31 Thus if a developer follows strictly the guidance provided by the Free
   32 Software Foundation, Section 9 of the GPL V2 provides the licensee the option
   33 to either use, modify or distribute the program under GPL V2 or under any
   34 later version published by the Free Software Foundation.
   35 
   36 SNORT is an open source project that is governed exclusively by the GPL V2
   37 and any third party desiring to use, modify or distribute SNORT must do so by
   38 strictly following the terms and conditions of GPL V2. Anyone using, modifying
   39 or distributing SNORT does not have the option to chose to use, modify or
   40 distribute SNORT under any revised or new version of the GPL, including
   41 without limitation, the GNU General Public License Version 3.
   42 
   43 For 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
   47 the terms of the GNU General Public License Version 2 as published by the Free
   48 Software Foundation. You may not use, modify or distribute this program under
   49 any other version of the GNU General Public License."
   50 
   51 If you have any questions about this statement, please feel free to email
   52 snort-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      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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
   66 freedom to share and change it.  By contrast, the GNU General Public
   67 License is intended to guarantee your freedom to share and change free
   68 software--to make sure the software is free for all its users.  This
   69 General Public License applies to most of the Free Software
   70 Foundation's software and to any other program whose authors commit to
   71 using it.  (Some other Free Software Foundation software is covered by
   72 the GNU Library General Public License instead.)  You can apply it to
   73 your programs, too.
   74 
   75   When we speak of free software, we are referring to freedom, not
   76 price.  Our General Public Licenses are designed to make sure that you
   77 have the freedom to distribute copies of free software (and charge for
   78 this service if you wish), that you receive source code or can get it
   79 if you want it, that you can change the software or use pieces of it
   80 in 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
   83 anyone to deny you these rights or to ask you to surrender the rights.
   84 These restrictions translate to certain responsibilities for you if you
   85 distribute copies of the software, or if you modify it.
   86 
   87   For example, if you distribute copies of such a program, whether
   88 gratis or for a fee, you must give the recipients all the rights that
   89 you have.  You must make sure that they, too, receive or can get the
   90 source code.  And you must show them these terms so they know their
   91 rights.
   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,
   95 distribute and/or modify the software.
   96 
   97   Also, for each author's protection and ours, we want to make certain
   98 that everyone understands that there is no warranty for this free
   99 software.  If the software is modified by someone else and passed on, we
  100 want its recipients to know that what they have is not the original, so
  101 that any problems introduced by others will not reflect on the original
  102 authors' reputations.
  103 
  104   Finally, any free program is threatened constantly by software
  105 patents.  We wish to avoid the danger that redistributors of a free
  106 program will individually obtain patent licenses, in effect making the
  107 program proprietary.  To prevent this, we have made it clear that any
  108 patent must be licensed for everyone's free use or not licensed at all.
  109 
  110   The precise terms and conditions for copying, distribution and
  111 modification 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
  117 a notice placed by the copyright holder saying it may be distributed
  118 under the terms of this General Public License.  The "Program", below,
  119 refers to any such program or work, and a "work based on the Program"
  120 means either the Program or any derivative work under copyright law:
  121 that is to say, a work containing the Program or a portion of it,
  122 either verbatim or with modifications and/or translated into another
  123 language.  (Hereinafter, translation is included without limitation in
  124 the term "modification".)  Each licensee is addressed as "you".
  125 
  126 Activities other than copying, distribution and modification are not
  127 covered by this License; they are outside its scope.  The act of
  128 running the Program is not restricted, and the output from the Program
  129 is covered only if its contents constitute a work based on the
  130 Program (independent of having been made by running the Program).
  131 Whether that is true depends on what the Program does.
  132 
  133   1. You may copy and distribute verbatim copies of the Program's
  134 source code as you receive it, in any medium, provided that you
  135 conspicuously and appropriately publish on each copy an appropriate
  136 copyright notice and disclaimer of warranty; keep intact all the
  137 notices that refer to this License and to the absence of any warranty;
  138 and give any other recipients of the Program a copy of this License
  139 along with the Program.
  140 
  141 You may charge a fee for the physical act of transferring a copy, and
  142 you 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
  145 of it, thus forming a work based on the Program, and copy and
  146 distribute such modifications or work under the terms of Section 1
  147 above, 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 
  168 These requirements apply to the modified work as a whole.  If
  169 identifiable sections of that work are not derived from the Program,
  170 and can be reasonably considered independent and separate works in
  171 themselves, then this License, and its terms, do not apply to those
  172 sections when you distribute them as separate works.  But when you
  173 distribute the same sections as part of a whole which is a work based
  174 on the Program, the distribution of the whole must be on the terms of
  175 this License, whose permissions for other licensees extend to the
  176 entire whole, and thus to each and every part regardless of who wrote it.
  177 
  178 Thus, it is not the intent of this section to claim rights or contest
  179 your rights to work written entirely by you; rather, the intent is to
  180 exercise the right to control the distribution of derivative or
  181 collective works based on the Program.
  182 
  183 In addition, mere aggregation of another work not based on the Program
  184 with the Program (or with a work based on the Program) on a volume of
  185 a storage or distribution medium does not bring the other work under
  186 the scope of this License.
  187 
  188   3. You may copy and distribute the Program (or a work based on it,
  189 under Section 2) in object code or executable form under the terms of
  190 Sections 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 
  209 The source code for a work means the preferred form of the work for
  210 making modifications to it.  For an executable work, complete source
  211 code means all the source code for all modules it contains, plus any
  212 associated interface definition files, plus the scripts used to
  213 control compilation and installation of the executable.  However, as a
  214 special exception, the source code distributed need not include
  215 anything that is normally distributed (in either source or binary
  216 form) with the major components (compiler, kernel, and so on) of the
  217 operating system on which the executable runs, unless that component
  218 itself accompanies the executable.
  219 
  220 If distribution of executable or object code is made by offering
  221 access to copy from a designated place, then offering equivalent
  222 access to copy the source code from the same place counts as
  223 distribution of the source code, even though third parties are not
  224 compelled to copy the source along with the object code.
  225 
  226   4. You may not copy, modify, sublicense, or distribute the Program
  227 except as expressly provided under this License.  Any attempt
  228 otherwise to copy, modify, sublicense or distribute the Program is
  229 void, and will automatically terminate your rights under this License.
  230 However, parties who have received copies, or rights, from you under
  231 this License will not have their licenses terminated so long as such
  232 parties remain in full compliance.
  233 
  234   5. You are not required to accept this License, since you have not
  235 signed it.  However, nothing else grants you permission to modify or
  236 distribute the Program or its derivative works.  These actions are
  237 prohibited by law if you do not accept this License.  Therefore, by
  238 modifying or distributing the Program (or any work based on the
  239 Program), you indicate your acceptance of this License to do so, and
  240 all its terms and conditions for copying, distributing or modifying
  241 the Program or works based on it.
  242 
  243   6. Each time you redistribute the Program (or any work based on the
  244 Program), the recipient automatically receives a license from the
  245 original licensor to copy, distribute or modify the Program subject to
  246 these terms and conditions.  You may not impose any further
  247 restrictions on the recipients' exercise of the rights granted herein.
  248 You are not responsible for enforcing compliance by third parties to
  249 this License.
  250 
  251   7. If, as a consequence of a court judgment or allegation of patent
  252 infringement or for any other reason (not limited to patent issues),
  253 conditions are imposed on you (whether by court order, agreement or
  254 otherwise) that contradict the conditions of this License, they do not
  255 excuse you from the conditions of this License.  If you cannot
  256 distribute so as to satisfy simultaneously your obligations under this
  257 License and any other pertinent obligations, then as a consequence you
  258 may not distribute the Program at all.  For example, if a patent
  259 license would not permit royalty-free redistribution of the Program by
  260 all those who receive copies directly or indirectly through you, then
  261 the only way you could satisfy both it and this License would be to
  262 refrain entirely from distribution of the Program.
  263 
  264 If any portion of this section is held invalid or unenforceable under
  265 any particular circumstance, the balance of the section is intended to
  266 apply and the section as a whole is intended to apply in other
  267 circumstances.
  268 
  269 It is not the purpose of this section to induce you to infringe any
  270 patents or other property right claims or to contest validity of any
  271 such claims; this section has the sole purpose of protecting the
  272 integrity of the free software distribution system, which is
  273 implemented by public license practices.  Many people have made
  274 generous contributions to the wide range of software distributed
  275 through that system in reliance on consistent application of that
  276 system; it is up to the author/donor to decide if he or she is willing
  277 to distribute software through any other system and a licensee cannot
  278 impose that choice.
  279 
  280 This section is intended to make thoroughly clear what is believed to
  281 be a consequence of the rest of this License.
  282 
  283   8. If the distribution and/or use of the Program is restricted in
  284 certain countries either by patents or by copyrighted interfaces, the
  285 original copyright holder who places the Program under this License
  286 may add an explicit geographical distribution limitation excluding
  287 those countries, so that distribution is permitted only in or among
  288 countries not thus excluded.  In such case, this License incorporates
  289 the limitation as if written in the body of this License.
  290 
  291   9. The Free Software Foundation may publish revised and/or new versions
  292 of the General Public License from time to time.  Such new versions will
  293 be similar in spirit to the present version, but may differ in detail to
  294 address new problems or concerns.
  295 
  296 Each version is given a distinguishing version number.  If the Program
  297 specifies a version number of this License which applies to it and "any
  298 later version", you have the option of following the terms and conditions
  299 either of that version or of any later version published by the Free
  300 Software Foundation.  If the Program does not specify a version number of
  301 this License, you may choose any version ever published by the Free Software
  302 Foundation.
  303 
  304   10. If you wish to incorporate parts of the Program into other free
  305 programs whose distribution conditions are different, write to the author
  306 to ask for permission.  For software which is copyrighted by the Free
  307 Software Foundation, write to the Free Software Foundation; we sometimes
  308 make exceptions for this.  Our decision will be guided by the two goals
  309 of preserving the free status of all derivatives of our free software and
  310 of 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
  315 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  316 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  317 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  318 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  319 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  320 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  321 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  322 REPAIR OR CORRECTION.
  323 
  324   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  325 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  326 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  327 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  328 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  329 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  330 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  331 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  332 POSSIBILITY 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
  339 possible use to the public, the best way to achieve this is to make it
  340 free 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
  343 to attach them to the start of each source file to most effectively
  344 convey the exclusion of warranty; and each file should have at least
  345 the "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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  363     USA
  364 
  365 
  366 Also add information on how to contact you by electronic and paper mail.
  367 
  368 If the program is interactive, make it output a short notice like this
  369 when it starts in an interactive mode:
  370 
  371     Gnomovision version 69, Copyright (C) 19yy name of author
  372     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  373     This is free software, and you are welcome to redistribute it
  374     under certain conditions; type `show c' for details.
  375 
  376 The hypothetical commands `show w' and `show c' should show the appropriate
  377 parts of the General Public License.  Of course, the commands you use may
  378 be called something other than `show w' and `show c'; they could even be
  379 mouse-clicks or menu items--whatever suits your program.
  380 
  381 You should also get your employer (if you work as a programmer) or your
  382 school, if any, to sign a "copyright disclaimer" for the program, if
  383 necessary.  Here is a sample; alter the names:
  384 
  385   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  386   `Gnomovision' (which makes passes at compilers) written by James Hacker.
  387 
  388   <signature of Ty Coon>, 1 April 1989
  389   Ty Coon, President of Vice
  390 
  391 This General Public License does not permit incorporating your program into
  392 proprietary programs.  If your program is a subroutine library, you may
  393 consider it more useful to permit linking proprietary applications with the
  394 library.  If this is what you want to do, use the GNU Library General
  395 Public License instead of this License.