  		    GNU GENERAL PUBLIC LICENSE 		       Version 2, June 1991   8  Copyright (C) 1989, 1991 Free Software Foundation, Inc.@                           675 Mass Ave, Cambridge, MA 02139, USA=  Everyone is permitted to copy and distribute verbatim copies :  of this license document, but changing it is not allowed.   			    Preamble   ?   The licenses for most software are designed to take away your D freedom to share and change it.  By contrast, the GNU General PublicF License is intended to guarantee your freedom to share and change freeD software--to make sure the software is free for all its users.  This; General Public License applies to most of the Free Software F Foundation's software and to any other program whose authors commit toF using it.  (Some other Free Software Foundation software is covered byE the GNU Library General Public License instead.)  You can apply it to  your programs, too.   B   When we speak of free software, we are referring to freedom, notF price.  Our General Public Licenses are designed to make sure that youF have the freedom to distribute copies of free software (and charge forE this service if you wish), that you receive source code or can get it D if you want it, that you can change the software or use pieces of it@ in new free programs; and that you know you can do these things.  B   To protect your rights, we need to make restrictions that forbidF anyone to deny you these rights or to ask you to surrender the rights.G These restrictions translate to certain responsibilities for you if you 7 distribute copies of the software, or if you modify it.   B   For example, if you distribute copies of such a program, whetherE gratis or for a fee, you must give the recipients all the rights that D you have.  You must make sure that they, too, receive or can get theC source code.  And you must show them these terms so they know their  rights.   H   We protect your rights with two steps: (1) copyright the software, andD (2) offer you this license which gives you legal permission to copy,& distribute and/or modify the software.  F   Also, for each author's protection and ours, we want to make certainA that everyone understands that there is no warranty for this free H software.  If the software is modified by someone else and passed on, weG want its recipients to know that what they have is not the original, so G that any problems introduced by others will not reflect on the original  authors' reputations.   @   Finally, any free program is threatened constantly by softwareC patents.  We wish to avoid the danger that redistributors of a free F program will individually obtain patent licenses, in effect making theE program proprietary.  To prevent this, we have made it clear that any G patent must be licensed for everyone's free use or not licensed at all.   @   The precise terms and conditions for copying, distribution and modification follow.    		    GNU GENERAL PUBLIC LICENSEB    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION  E   0. This License applies to any program or other work which contains D a notice placed by the copyright holder saying it may be distributedF under the terms of this General Public License.  The "Program", below,E refers to any such program or work, and a "work based on the Program" D means either the Program or any derivative work under copyright law:A that is to say, a work containing the Program or a portion of it, D either verbatim or with modifications and/or translated into anotherF language.  (Hereinafter, translation is included without limitation in? the term "modification".)  Each licensee is addressed as "you".   D Activities other than copying, distribution and modification are not@ covered by this License; they are outside its scope.  The act ofF running the Program is not restricted, and the output from the Program> is covered only if its contents constitute a work based on theA Program (independent of having been made by running the Program). 6 Whether that is true depends on what the Program does.  A   1. You may copy and distribute verbatim copies of the Program's ? source code as you receive it, in any medium, provided that you C conspicuously and appropriately publish on each copy an appropriate @ copyright notice and disclaimer of warranty; keep intact all theF notices that refer to this License and to the absence of any warranty;C and give any other recipients of the Program a copy of this License  along with the Program.   E You may charge a fee for the physical act of transferring a copy, and G you may at your option offer warranty protection in exchange for a fee.   E   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 copy and B distribute such modifications or work under the terms of Section 1; above, provided that you also meet all of these conditions:   C     a) You must cause the modified files to carry prominent notices B     stating that you changed the files and the date of any change.  F     b) You must cause any work that you distribute or publish, that inC     whole or in part contains or is derived from the Program or any E     part thereof, to be licensed as a whole at no charge to all third ,     parties under the terms of this License.  D     c) If the modified program normally reads commands interactively>     when run, you must cause it, when started running for suchD     interactive use in the most ordinary way, to print or display an@     announcement including an appropriate copyright notice and aF     notice that there is no warranty (or else, saying that you provideA     a warranty) and that users may redistribute the program under E     these conditions, and telling the user how to view a copy of this B     License.  (Exception: if the Program itself is interactive butD     does not normally print such an announcement, your work based on:     the Program is not required to print an announcement.)  = These requirements apply to the modified work as a whole.  If D identifiable sections of that work are not derived from the Program,B and can be reasonably considered independent and separate works inC themselves, then this License, and its terms, do not apply to those B sections when you distribute them as separate works.  But when youE distribute the same sections as part of a whole which is a work based E on the Program, the distribution of the whole must be on the terms of A this License, whose permissions for other licensees extend to the I entire whole, and thus to each and every part regardless of who wrote it.   E Thus, it is not the intent of this section to claim rights or contest E your rights to work written entirely by you; rather, the intent is to ? exercise the right to control the distribution of derivative or & collective works based on the Program.  F In addition, mere aggregation of another work not based on the ProgramE with the Program (or with a work based on the Program) on a volume of D a storage or distribution medium does not bring the other work under the scope of this License.  D   3. You may copy and distribute the Program (or a work based on it,E under Section 2) in object code or executable form under the terms of F Sections 1 and 2 above provided that you also do one of the following:  D     a) Accompany it with the complete corresponding machine-readableF     source code, which must be distributed under the terms of SectionsL     1 and 2 above on a medium customarily used for software interchange; or,  B     b) Accompany it with a written offer, valid for at least threeB     years, to give any third party, for a charge no more than yourA     cost of physically performing source distribution, a complete A     machine-readable copy of the corresponding source code, to be E     distributed under the terms of Sections 1 and 2 above on a medium 2     customarily used for software interchange; or,  E     c) Accompany it with the information you received as to the offer B     to distribute corresponding source code.  (This alternative is?     allowed only for noncommercial distribution and only if you D     received the program in object code or executable form with such1     an offer, in accord with Subsection b above.)   C The source code for a work means the preferred form of the work for D making modifications to it.  For an executable work, complete sourceD code means all the source code for all modules it contains, plus any? associated interface definition files, plus the scripts used to F control compilation and installation of the executable.  However, as a? special exception, the source code distributed need not include A anything that is normally distributed (in either source or binary D form) with the major components (compiler, kernel, and so on) of theD operating system on which the executable runs, unless that component" itself accompanies the executable.  @ If distribution of executable or object code is made by offering@ access to copy from a designated place, then offering equivalent< access to copy the source code from the same place counts asB distribution of the source code, even though third parties are not8 compelled to copy the source along with the object code.  D   4. You may not copy, modify, sublicense, or distribute the Program= except as expressly provided under this License.  Any attempt B otherwise to copy, modify, sublicense or distribute the Program isF void, and will automatically terminate your rights under this License.D However, parties who have received copies, or rights, from you underD this License will not have their licenses terminated so long as such" parties remain in full compliance.  D   5. You are not required to accept this License, since you have notD signed it.  However, nothing else grants you permission to modify orB distribute the Program or its derivative works.  These actions areC prohibited by law if you do not accept this License.  Therefore, by ? modifying or distributing the Program (or any work based on the D Program), you indicate your acceptance of this License to do so, andC all its terms and conditions for copying, distributing or modifying ! the Program or works based on it.   E   6. Each time you redistribute the Program (or any work based on the A Program), the recipient automatically receives a license from the F original licensor to copy, distribute or modify the Program subject to; these terms and conditions.  You may not impose any further F restrictions on the recipients' exercise of the rights granted herein.D You are not responsible for enforcing compliance by third parties to
 this License.   E   7. If, as a consequence of a court judgment or allegation of patent D infringement or for any other reason (not limited to patent issues),C conditions are imposed on you (whether by court order, agreement or F otherwise) that contradict the conditions of this License, they do not> excuse you from the conditions of this License.  If you cannotF distribute so as to satisfy simultaneously your obligations under thisF License and any other pertinent obligations, then as a consequence you@ may not distribute the Program at all.  For example, if a patentF license would not permit royalty-free redistribution of the Program byE all those who receive copies directly or indirectly through you, then C the only way you could satisfy both it and this License would be to 2 refrain entirely from distribution of the Program.  E If any portion of this section is held invalid or unenforceable under F any particular circumstance, the balance of the section is intended to> apply and the section as a whole is intended to apply in other circumstances.  C It is not the purpose of this section to induce you to infringe any D patents or other property right claims or to contest validity of any@ such claims; this section has the sole purpose of protecting the< integrity of the free software distribution system, which is? implemented by public license practices.  Many people have made @ generous contributions to the wide range of software distributedA through that system in reliance on consistent application of that F system; it is up to the author/donor to decide if he or she is willingE to distribute software through any other system and a licensee cannot  impose that choice.   E This section is intended to make thoroughly clear what is believed to - be a consequence of the rest of this License.   C   8. If the distribution and/or use of the Program is restricted in E certain countries either by patents or by copyrighted interfaces, the C original copyright holder who places the Program under this License B may add an explicit geographical distribution limitation excludingC those countries, so that distribution is permitted only in or among E countries not thus excluded.  In such case, this License incorporates 9 the limitation as if written in the body of this License.   I   9. The Free Software Foundation may publish revised and/or new versions H of the General Public License from time to time.  Such new versions willH be similar in spirit to the present version, but may differ in detail to! address new problems or concerns.   F Each version is given a distinguishing version number.  If the ProgramG specifies a version number of this License which applies to it and "any I later version", you have the option of following the terms and conditions D either of that version or of any later version published by the FreeI Software Foundation.  If the Program does not specify a version number of L this License, you may choose any version ever published by the Free Software Foundation.   E   10. If you wish to incorporate parts of the Program into other free I programs whose distribution conditions are different, write to the author E to ask for permission.  For software which is copyrighted by the Free H Software Foundation, write to the Free Software Foundation; we sometimesG make exceptions for this.  Our decision will be guided by the two goals I of preserving the free status of all derivatives of our free software and 9 of promoting the sharing and reuse of software generally.    			    NO WARRANTY  J   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTYH FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHENF OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIESJ PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSEDD OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OFI MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS F TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THEH PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.   K   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING C WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR J REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,K INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING I OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED H TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BYJ YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHERE PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE  POSSIBILITY OF SUCH DAMAGES.  " 		     END OF TERMS AND CONDITIONS  8 	Appendix: How to Apply These Terms to Your New Programs  E   If you develop a new program, and you want it to be of the greatest F possible use to the public, the best way to achieve this is to make itK free software which everyone can redistribute and change under these terms.   F   To do so, attach the following notices to the program.  It is safestC to attach them to the start of each source file to most effectively D convey the exclusion of warranty; and each file should have at leastE the "copyright" line and a pointer to where the full notice is found.   K     <one line to give the program's name and a brief idea of what it does.> (     Copyright (C) 19yy  <name of author>  H     This program is free software; you can redistribute it and/or modifyH     it under the terms of the GNU General Public License as published byE     the Free Software Foundation; either version 2 of the License, or2'     (at your option) any later version.   C     This program is distributed in the hope that it will be useful, B     but WITHOUT ANY WARRANTY; without even the implied warranty ofA     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 0     GNU General Public License for more details.  E     You should have received a copy of the GNU General Public Licensec?     along with this program; if not, write to the Free Softwaree=     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.-  H Also add information on how to contact you by electronic and paper mail.  F If the program is interactive, make it output a short notice like this& when it starts in an interactive mode:  =     Gnomovision version 69, Copyright (C) 19yy name of authoroM     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. A     This is free software, and you are welcome to redistribute itr8     under certain conditions; type `show c' for details.  K The hypothetical commands `show w' and `show c' should show the appropriatefI parts of the General Public License.  Of course, the commands you use may H be called something other than `show w' and `show c'; they could even be8 mouse-clicks or menu items--whatever suits your program.  G You should also get your employer (if you work as a programmer) or your D school, if any, to sign a "copyright disclaimer" for the program, if. necessary.  Here is a sample; alter the names:  H   Yoyodyne, Inc., hereby disclaims all copyright interest in the programJ   `Gnomovision' (which makes passes at compilers) written by James Hacker.  &   <signature of Ty Coon>, 1 April 1989   Ty Coon, President of Vice  K This General Public License does not permit incorporating your program intoeG proprietary programs.  If your program is a subroutine library, you mayhK consider it more useful to permit linking proprietary applications with therE library.  If this is what you want to do, use the GNU Library Generall' Public License instead of this License.o  