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

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