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1*e948b3e4Syifeizhao                    GNU GENERAL PUBLIC LICENSE
2*e948b3e4Syifeizhao                       Version 2, June 1991
3*e948b3e4Syifeizhao
4*e948b3e4Syifeizhao Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
5*e948b3e4Syifeizhao 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
6*e948b3e4Syifeizhao Everyone is permitted to copy and distribute verbatim copies
7*e948b3e4Syifeizhao of this license document, but changing it is not allowed.
8*e948b3e4Syifeizhao
9*e948b3e4Syifeizhao                            Preamble
10*e948b3e4Syifeizhao
11*e948b3e4Syifeizhao  The licenses for most software are designed to take away your
12*e948b3e4Syifeizhaofreedom to share and change it.  By contrast, the GNU General Public
13*e948b3e4SyifeizhaoLicense is intended to guarantee your freedom to share and change free
14*e948b3e4Syifeizhaosoftware--to make sure the software is free for all its users.  This
15*e948b3e4SyifeizhaoGeneral Public License applies to most of the Free Software
16*e948b3e4SyifeizhaoFoundation's software and to any other program whose authors commit to
17*e948b3e4Syifeizhaousing it.  (Some other Free Software Foundation software is covered by
18*e948b3e4Syifeizhaothe GNU Lesser General Public License instead.)  You can apply it to
19*e948b3e4Syifeizhaoyour programs, too.
20*e948b3e4Syifeizhao
21*e948b3e4Syifeizhao  When we speak of free software, we are referring to freedom, not
22*e948b3e4Syifeizhaoprice.  Our General Public Licenses are designed to make sure that you
23*e948b3e4Syifeizhaohave the freedom to distribute copies of free software (and charge for
24*e948b3e4Syifeizhaothis service if you wish), that you receive source code or can get it
25*e948b3e4Syifeizhaoif you want it, that you can change the software or use pieces of it
26*e948b3e4Syifeizhaoin new free programs; and that you know you can do these things.
27*e948b3e4Syifeizhao
28*e948b3e4Syifeizhao  To protect your rights, we need to make restrictions that forbid
29*e948b3e4Syifeizhaoanyone to deny you these rights or to ask you to surrender the rights.
30*e948b3e4SyifeizhaoThese restrictions translate to certain responsibilities for you if you
31*e948b3e4Syifeizhaodistribute copies of the software, or if you modify it.
32*e948b3e4Syifeizhao
33*e948b3e4Syifeizhao  For example, if you distribute copies of such a program, whether
34*e948b3e4Syifeizhaogratis or for a fee, you must give the recipients all the rights that
35*e948b3e4Syifeizhaoyou have.  You must make sure that they, too, receive or can get the
36*e948b3e4Syifeizhaosource code.  And you must show them these terms so they know their
37*e948b3e4Syifeizhaorights.
38*e948b3e4Syifeizhao
39*e948b3e4Syifeizhao  We protect your rights with two steps: (1) copyright the software, and
40*e948b3e4Syifeizhao(2) offer you this license which gives you legal permission to copy,
41*e948b3e4Syifeizhaodistribute and/or modify the software.
42*e948b3e4Syifeizhao
43*e948b3e4Syifeizhao  Also, for each author's protection and ours, we want to make certain
44*e948b3e4Syifeizhaothat everyone understands that there is no warranty for this free
45*e948b3e4Syifeizhaosoftware.  If the software is modified by someone else and passed on, we
46*e948b3e4Syifeizhaowant its recipients to know that what they have is not the original, so
47*e948b3e4Syifeizhaothat any problems introduced by others will not reflect on the original
48*e948b3e4Syifeizhaoauthors' reputations.
49*e948b3e4Syifeizhao
50*e948b3e4Syifeizhao  Finally, any free program is threatened constantly by software
51*e948b3e4Syifeizhaopatents.  We wish to avoid the danger that redistributors of a free
52*e948b3e4Syifeizhaoprogram will individually obtain patent licenses, in effect making the
53*e948b3e4Syifeizhaoprogram proprietary.  To prevent this, we have made it clear that any
54*e948b3e4Syifeizhaopatent must be licensed for everyone's free use or not licensed at all.
55*e948b3e4Syifeizhao
56*e948b3e4Syifeizhao  The precise terms and conditions for copying, distribution and
57*e948b3e4Syifeizhaomodification follow.
58*e948b3e4Syifeizhao
59*e948b3e4Syifeizhao                    GNU GENERAL PUBLIC LICENSE
60*e948b3e4Syifeizhao   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
61*e948b3e4Syifeizhao
62*e948b3e4Syifeizhao  0. This License applies to any program or other work which contains
63*e948b3e4Syifeizhaoa notice placed by the copyright holder saying it may be distributed
64*e948b3e4Syifeizhaounder the terms of this General Public License.  The "Program", below,
65*e948b3e4Syifeizhaorefers to any such program or work, and a "work based on the Program"
66*e948b3e4Syifeizhaomeans either the Program or any derivative work under copyright law:
67*e948b3e4Syifeizhaothat is to say, a work containing the Program or a portion of it,
68*e948b3e4Syifeizhaoeither verbatim or with modifications and/or translated into another
69*e948b3e4Syifeizhaolanguage.  (Hereinafter, translation is included without limitation in
70*e948b3e4Syifeizhaothe term "modification".)  Each licensee is addressed as "you".
71*e948b3e4Syifeizhao
72*e948b3e4SyifeizhaoActivities other than copying, distribution and modification are not
73*e948b3e4Syifeizhaocovered by this License; they are outside its scope.  The act of
74*e948b3e4Syifeizhaorunning the Program is not restricted, and the output from the Program
75*e948b3e4Syifeizhaois covered only if its contents constitute a work based on the
76*e948b3e4SyifeizhaoProgram (independent of having been made by running the Program).
77*e948b3e4SyifeizhaoWhether that is true depends on what the Program does.
78*e948b3e4Syifeizhao
79*e948b3e4Syifeizhao  1. You may copy and distribute verbatim copies of the Program's
80*e948b3e4Syifeizhaosource code as you receive it, in any medium, provided that you
81*e948b3e4Syifeizhaoconspicuously and appropriately publish on each copy an appropriate
82*e948b3e4Syifeizhaocopyright notice and disclaimer of warranty; keep intact all the
83*e948b3e4Syifeizhaonotices that refer to this License and to the absence of any warranty;
84*e948b3e4Syifeizhaoand give any other recipients of the Program a copy of this License
85*e948b3e4Syifeizhaoalong with the Program.
86*e948b3e4Syifeizhao
87*e948b3e4SyifeizhaoYou may charge a fee for the physical act of transferring a copy, and
88*e948b3e4Syifeizhaoyou may at your option offer warranty protection in exchange for a fee.
89*e948b3e4Syifeizhao
90*e948b3e4Syifeizhao  2. You may modify your copy or copies of the Program or any portion
91*e948b3e4Syifeizhaoof it, thus forming a work based on the Program, and copy and
92*e948b3e4Syifeizhaodistribute such modifications or work under the terms of Section 1
93*e948b3e4Syifeizhaoabove, provided that you also meet all of these conditions:
94*e948b3e4Syifeizhao
95*e948b3e4Syifeizhao    a) You must cause the modified files to carry prominent notices
96*e948b3e4Syifeizhao    stating that you changed the files and the date of any change.
97*e948b3e4Syifeizhao
98*e948b3e4Syifeizhao    b) You must cause any work that you distribute or publish, that in
99*e948b3e4Syifeizhao    whole or in part contains or is derived from the Program or any
100*e948b3e4Syifeizhao    part thereof, to be licensed as a whole at no charge to all third
101*e948b3e4Syifeizhao    parties under the terms of this License.
102*e948b3e4Syifeizhao
103*e948b3e4Syifeizhao    c) If the modified program normally reads commands interactively
104*e948b3e4Syifeizhao    when run, you must cause it, when started running for such
105*e948b3e4Syifeizhao    interactive use in the most ordinary way, to print or display an
106*e948b3e4Syifeizhao    announcement including an appropriate copyright notice and a
107*e948b3e4Syifeizhao    notice that there is no warranty (or else, saying that you provide
108*e948b3e4Syifeizhao    a warranty) and that users may redistribute the program under
109*e948b3e4Syifeizhao    these conditions, and telling the user how to view a copy of this
110*e948b3e4Syifeizhao    License.  (Exception: if the Program itself is interactive but
111*e948b3e4Syifeizhao    does not normally print such an announcement, your work based on
112*e948b3e4Syifeizhao    the Program is not required to print an announcement.)
113*e948b3e4Syifeizhao
114*e948b3e4SyifeizhaoThese requirements apply to the modified work as a whole.  If
115*e948b3e4Syifeizhaoidentifiable sections of that work are not derived from the Program,
116*e948b3e4Syifeizhaoand can be reasonably considered independent and separate works in
117*e948b3e4Syifeizhaothemselves, then this License, and its terms, do not apply to those
118*e948b3e4Syifeizhaosections when you distribute them as separate works.  But when you
119*e948b3e4Syifeizhaodistribute the same sections as part of a whole which is a work based
120*e948b3e4Syifeizhaoon the Program, the distribution of the whole must be on the terms of
121*e948b3e4Syifeizhaothis License, whose permissions for other licensees extend to the
122*e948b3e4Syifeizhaoentire whole, and thus to each and every part regardless of who wrote it.
123*e948b3e4Syifeizhao
124*e948b3e4SyifeizhaoThus, it is not the intent of this section to claim rights or contest
125*e948b3e4Syifeizhaoyour rights to work written entirely by you; rather, the intent is to
126*e948b3e4Syifeizhaoexercise the right to control the distribution of derivative or
127*e948b3e4Syifeizhaocollective works based on the Program.
128*e948b3e4Syifeizhao
129*e948b3e4SyifeizhaoIn addition, mere aggregation of another work not based on the Program
130*e948b3e4Syifeizhaowith the Program (or with a work based on the Program) on a volume of
131*e948b3e4Syifeizhaoa storage or distribution medium does not bring the other work under
132*e948b3e4Syifeizhaothe scope of this License.
133*e948b3e4Syifeizhao
134*e948b3e4Syifeizhao  3. You may copy and distribute the Program (or a work based on it,
135*e948b3e4Syifeizhaounder Section 2) in object code or executable form under the terms of
136*e948b3e4SyifeizhaoSections 1 and 2 above provided that you also do one of the following:
137*e948b3e4Syifeizhao
138*e948b3e4Syifeizhao    a) Accompany it with the complete corresponding machine-readable
139*e948b3e4Syifeizhao    source code, which must be distributed under the terms of Sections
140*e948b3e4Syifeizhao    1 and 2 above on a medium customarily used for software interchange; or,
141*e948b3e4Syifeizhao
142*e948b3e4Syifeizhao    b) Accompany it with a written offer, valid for at least three
143*e948b3e4Syifeizhao    years, to give any third party, for a charge no more than your
144*e948b3e4Syifeizhao    cost of physically performing source distribution, a complete
145*e948b3e4Syifeizhao    machine-readable copy of the corresponding source code, to be
146*e948b3e4Syifeizhao    distributed under the terms of Sections 1 and 2 above on a medium
147*e948b3e4Syifeizhao    customarily used for software interchange; or,
148*e948b3e4Syifeizhao
149*e948b3e4Syifeizhao    c) Accompany it with the information you received as to the offer
150*e948b3e4Syifeizhao    to distribute corresponding source code.  (This alternative is
151*e948b3e4Syifeizhao    allowed only for noncommercial distribution and only if you
152*e948b3e4Syifeizhao    received the program in object code or executable form with such
153*e948b3e4Syifeizhao    an offer, in accord with Subsection b above.)
154*e948b3e4Syifeizhao
155*e948b3e4SyifeizhaoThe source code for a work means the preferred form of the work for
156*e948b3e4Syifeizhaomaking modifications to it.  For an executable work, complete source
157*e948b3e4Syifeizhaocode means all the source code for all modules it contains, plus any
158*e948b3e4Syifeizhaoassociated interface definition files, plus the scripts used to
159*e948b3e4Syifeizhaocontrol compilation and installation of the executable.  However, as a
160*e948b3e4Syifeizhaospecial exception, the source code distributed need not include
161*e948b3e4Syifeizhaoanything that is normally distributed (in either source or binary
162*e948b3e4Syifeizhaoform) with the major components (compiler, kernel, and so on) of the
163*e948b3e4Syifeizhaooperating system on which the executable runs, unless that component
164*e948b3e4Syifeizhaoitself accompanies the executable.
165*e948b3e4Syifeizhao
166*e948b3e4SyifeizhaoIf distribution of executable or object code is made by offering
167*e948b3e4Syifeizhaoaccess to copy from a designated place, then offering equivalent
168*e948b3e4Syifeizhaoaccess to copy the source code from the same place counts as
169*e948b3e4Syifeizhaodistribution of the source code, even though third parties are not
170*e948b3e4Syifeizhaocompelled to copy the source along with the object code.
171*e948b3e4Syifeizhao
172*e948b3e4Syifeizhao  4. You may not copy, modify, sublicense, or distribute the Program
173*e948b3e4Syifeizhaoexcept as expressly provided under this License.  Any attempt
174*e948b3e4Syifeizhaootherwise to copy, modify, sublicense or distribute the Program is
175*e948b3e4Syifeizhaovoid, and will automatically terminate your rights under this License.
176*e948b3e4SyifeizhaoHowever, parties who have received copies, or rights, from you under
177*e948b3e4Syifeizhaothis License will not have their licenses terminated so long as such
178*e948b3e4Syifeizhaoparties remain in full compliance.
179*e948b3e4Syifeizhao
180*e948b3e4Syifeizhao  5. You are not required to accept this License, since you have not
181*e948b3e4Syifeizhaosigned it.  However, nothing else grants you permission to modify or
182*e948b3e4Syifeizhaodistribute the Program or its derivative works.  These actions are
183*e948b3e4Syifeizhaoprohibited by law if you do not accept this License.  Therefore, by
184*e948b3e4Syifeizhaomodifying or distributing the Program (or any work based on the
185*e948b3e4SyifeizhaoProgram), you indicate your acceptance of this License to do so, and
186*e948b3e4Syifeizhaoall its terms and conditions for copying, distributing or modifying
187*e948b3e4Syifeizhaothe Program or works based on it.
188*e948b3e4Syifeizhao
189*e948b3e4Syifeizhao  6. Each time you redistribute the Program (or any work based on the
190*e948b3e4SyifeizhaoProgram), the recipient automatically receives a license from the
191*e948b3e4Syifeizhaooriginal licensor to copy, distribute or modify the Program subject to
192*e948b3e4Syifeizhaothese terms and conditions.  You may not impose any further
193*e948b3e4Syifeizhaorestrictions on the recipients' exercise of the rights granted herein.
194*e948b3e4SyifeizhaoYou are not responsible for enforcing compliance by third parties to
195*e948b3e4Syifeizhaothis License.
196*e948b3e4Syifeizhao
197*e948b3e4Syifeizhao  7. If, as a consequence of a court judgment or allegation of patent
198*e948b3e4Syifeizhaoinfringement or for any other reason (not limited to patent issues),
199*e948b3e4Syifeizhaoconditions are imposed on you (whether by court order, agreement or
200*e948b3e4Syifeizhaootherwise) that contradict the conditions of this License, they do not
201*e948b3e4Syifeizhaoexcuse you from the conditions of this License.  If you cannot
202*e948b3e4Syifeizhaodistribute so as to satisfy simultaneously your obligations under this
203*e948b3e4SyifeizhaoLicense and any other pertinent obligations, then as a consequence you
204*e948b3e4Syifeizhaomay not distribute the Program at all.  For example, if a patent
205*e948b3e4Syifeizhaolicense would not permit royalty-free redistribution of the Program by
206*e948b3e4Syifeizhaoall those who receive copies directly or indirectly through you, then
207*e948b3e4Syifeizhaothe only way you could satisfy both it and this License would be to
208*e948b3e4Syifeizhaorefrain entirely from distribution of the Program.
209*e948b3e4Syifeizhao
210*e948b3e4SyifeizhaoIf any portion of this section is held invalid or unenforceable under
211*e948b3e4Syifeizhaoany particular circumstance, the balance of the section is intended to
212*e948b3e4Syifeizhaoapply and the section as a whole is intended to apply in other
213*e948b3e4Syifeizhaocircumstances.
214*e948b3e4Syifeizhao
215*e948b3e4SyifeizhaoIt is not the purpose of this section to induce you to infringe any
216*e948b3e4Syifeizhaopatents or other property right claims or to contest validity of any
217*e948b3e4Syifeizhaosuch claims; this section has the sole purpose of protecting the
218*e948b3e4Syifeizhaointegrity of the free software distribution system, which is
219*e948b3e4Syifeizhaoimplemented by public license practices.  Many people have made
220*e948b3e4Syifeizhaogenerous contributions to the wide range of software distributed
221*e948b3e4Syifeizhaothrough that system in reliance on consistent application of that
222*e948b3e4Syifeizhaosystem; it is up to the author/donor to decide if he or she is willing
223*e948b3e4Syifeizhaoto distribute software through any other system and a licensee cannot
224*e948b3e4Syifeizhaoimpose that choice.
225*e948b3e4Syifeizhao
226*e948b3e4SyifeizhaoThis section is intended to make thoroughly clear what is believed to
227*e948b3e4Syifeizhaobe a consequence of the rest of this License.
228*e948b3e4Syifeizhao
229*e948b3e4Syifeizhao  8. If the distribution and/or use of the Program is restricted in
230*e948b3e4Syifeizhaocertain countries either by patents or by copyrighted interfaces, the
231*e948b3e4Syifeizhaooriginal copyright holder who places the Program under this License
232*e948b3e4Syifeizhaomay add an explicit geographical distribution limitation excluding
233*e948b3e4Syifeizhaothose countries, so that distribution is permitted only in or among
234*e948b3e4Syifeizhaocountries not thus excluded.  In such case, this License incorporates
235*e948b3e4Syifeizhaothe limitation as if written in the body of this License.
236*e948b3e4Syifeizhao
237*e948b3e4Syifeizhao  9. The Free Software Foundation may publish revised and/or new versions
238*e948b3e4Syifeizhaoof the General Public License from time to time.  Such new versions will
239*e948b3e4Syifeizhaobe similar in spirit to the present version, but may differ in detail to
240*e948b3e4Syifeizhaoaddress new problems or concerns.
241*e948b3e4Syifeizhao
242*e948b3e4SyifeizhaoEach version is given a distinguishing version number.  If the Program
243*e948b3e4Syifeizhaospecifies a version number of this License which applies to it and "any
244*e948b3e4Syifeizhaolater version", you have the option of following the terms and conditions
245*e948b3e4Syifeizhaoeither of that version or of any later version published by the Free
246*e948b3e4SyifeizhaoSoftware Foundation.  If the Program does not specify a version number of
247*e948b3e4Syifeizhaothis License, you may choose any version ever published by the Free Software
248*e948b3e4SyifeizhaoFoundation.
249*e948b3e4Syifeizhao
250*e948b3e4Syifeizhao  10. If you wish to incorporate parts of the Program into other free
251*e948b3e4Syifeizhaoprograms whose distribution conditions are different, write to the author
252*e948b3e4Syifeizhaoto ask for permission.  For software which is copyrighted by the Free
253*e948b3e4SyifeizhaoSoftware Foundation, write to the Free Software Foundation; we sometimes
254*e948b3e4Syifeizhaomake exceptions for this.  Our decision will be guided by the two goals
255*e948b3e4Syifeizhaoof preserving the free status of all derivatives of our free software and
256*e948b3e4Syifeizhaoof promoting the sharing and reuse of software generally.
257*e948b3e4Syifeizhao
258*e948b3e4Syifeizhao                            NO WARRANTY
259*e948b3e4Syifeizhao
260*e948b3e4Syifeizhao  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
261*e948b3e4SyifeizhaoFOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
262*e948b3e4SyifeizhaoOTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
263*e948b3e4SyifeizhaoPROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
264*e948b3e4SyifeizhaoOR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
265*e948b3e4SyifeizhaoMERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
266*e948b3e4SyifeizhaoTO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
267*e948b3e4SyifeizhaoPROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
268*e948b3e4SyifeizhaoREPAIR OR CORRECTION.
269*e948b3e4Syifeizhao
270*e948b3e4Syifeizhao  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
271*e948b3e4SyifeizhaoWILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
272*e948b3e4SyifeizhaoREDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
273*e948b3e4SyifeizhaoINCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
274*e948b3e4SyifeizhaoOUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
275*e948b3e4SyifeizhaoTO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
276*e948b3e4SyifeizhaoYOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
277*e948b3e4SyifeizhaoPROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
278*e948b3e4SyifeizhaoPOSSIBILITY OF SUCH DAMAGES.
279*e948b3e4Syifeizhao
280*e948b3e4Syifeizhao                     END OF TERMS AND CONDITIONS
281*e948b3e4Syifeizhao
282*e948b3e4Syifeizhao            How to Apply These Terms to Your New Programs
283*e948b3e4Syifeizhao
284*e948b3e4Syifeizhao  If you develop a new program, and you want it to be of the greatest
285*e948b3e4Syifeizhaopossible use to the public, the best way to achieve this is to make it
286*e948b3e4Syifeizhaofree software which everyone can redistribute and change under these terms.
287*e948b3e4Syifeizhao
288*e948b3e4Syifeizhao  To do so, attach the following notices to the program.  It is safest
289*e948b3e4Syifeizhaoto attach them to the start of each source file to most effectively
290*e948b3e4Syifeizhaoconvey the exclusion of warranty; and each file should have at least
291*e948b3e4Syifeizhaothe "copyright" line and a pointer to where the full notice is found.
292*e948b3e4Syifeizhao
293*e948b3e4Syifeizhao    <one line to give the program's name and a brief idea of what it does.>
294*e948b3e4Syifeizhao    Copyright (C) <year>  <name of author>
295*e948b3e4Syifeizhao
296*e948b3e4Syifeizhao    This program is free software; you can redistribute it and/or modify
297*e948b3e4Syifeizhao    it under the terms of the GNU General Public License as published by
298*e948b3e4Syifeizhao    the Free Software Foundation; either version 2 of the License, or
299*e948b3e4Syifeizhao    (at your option) any later version.
300*e948b3e4Syifeizhao
301*e948b3e4Syifeizhao    This program is distributed in the hope that it will be useful,
302*e948b3e4Syifeizhao    but WITHOUT ANY WARRANTY; without even the implied warranty of
303*e948b3e4Syifeizhao    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
304*e948b3e4Syifeizhao    GNU General Public License for more details.
305*e948b3e4Syifeizhao
306*e948b3e4Syifeizhao    You should have received a copy of the GNU General Public License along
307*e948b3e4Syifeizhao    with this program; if not, write to the Free Software Foundation, Inc.,
308*e948b3e4Syifeizhao    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
309*e948b3e4Syifeizhao
310*e948b3e4SyifeizhaoAlso add information on how to contact you by electronic and paper mail.
311*e948b3e4Syifeizhao
312*e948b3e4SyifeizhaoIf the program is interactive, make it output a short notice like this
313*e948b3e4Syifeizhaowhen it starts in an interactive mode:
314*e948b3e4Syifeizhao
315*e948b3e4Syifeizhao    Gnomovision version 69, Copyright (C) year name of author
316*e948b3e4Syifeizhao    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
317*e948b3e4Syifeizhao    This is free software, and you are welcome to redistribute it
318*e948b3e4Syifeizhao    under certain conditions; type `show c' for details.
319*e948b3e4Syifeizhao
320*e948b3e4SyifeizhaoThe hypothetical commands `show w' and `show c' should show the appropriate
321*e948b3e4Syifeizhaoparts of the General Public License.  Of course, the commands you use may
322*e948b3e4Syifeizhaobe called something other than `show w' and `show c'; they could even be
323*e948b3e4Syifeizhaomouse-clicks or menu items--whatever suits your program.
324*e948b3e4Syifeizhao
325*e948b3e4SyifeizhaoYou should also get your employer (if you work as a programmer) or your
326*e948b3e4Syifeizhaoschool, if any, to sign a "copyright disclaimer" for the program, if
327*e948b3e4Syifeizhaonecessary.  Here is a sample; alter the names:
328*e948b3e4Syifeizhao
329*e948b3e4Syifeizhao  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
330*e948b3e4Syifeizhao  `Gnomovision' (which makes passes at compilers) written by James Hacker.
331*e948b3e4Syifeizhao
332*e948b3e4Syifeizhao  <signature of Ty Coon>, 1 April 1989
333*e948b3e4Syifeizhao  Ty Coon, President of Vice
334*e948b3e4Syifeizhao
335*e948b3e4SyifeizhaoThis General Public License does not permit incorporating your program into
336*e948b3e4Syifeizhaoproprietary programs.  If your program is a subroutine library, you may
337*e948b3e4Syifeizhaoconsider it more useful to permit linking proprietary applications with the
338*e948b3e4Syifeizhaolibrary.  If this is what you want to do, use the GNU Lesser General
339*e948b3e4SyifeizhaoPublic License instead of this License.
340