1PERLGPL(1) Perl Programmers Reference Guide PERLGPL(1)
2
6 perlgpl - the GNU General Public License, version 1
7
9 You can refer to this document in Pod via "L<perlgpl>"
10 Or you can see this document by entering "perldoc perlgpl"
11
13 Perl is free software; you can redistribute it and/or modify it under
14 the terms of either:
15 a) the GNU General Public License as published by the Free
17 Software Foundation; either version 1, or (at your option) any
18 later version, or
19 b) the "Artistic License" which comes with this Kit.
21 This is the "GNU General Public License, version 1". It's here so that
23 modules, programs, etc., that want to declare this as their
24 distribution license can link to it.
25 For the Perl Artistic License, see perlartistic.
27
29 GNU GENERAL PUBLIC LICENSE
30 Version 1, February 1989
31 Copyright (C) 1989 Free Software Foundation, Inc.
33 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 Everyone is permitted to copy and distribute verbatim copies
36 of this license document, but changing it is not allowed.
37 Preamble
39 The license agreements of most software companies try to keep users
41 at the mercy of those companies. By contrast, our General Public
42 License is intended to guarantee your freedom to share and change free
43 software--to make sure the software is free for all its users. The
44 General Public License applies to the Free Software Foundation's
45 software and to any other program whose authors commit to using it.
46 You can use it for your programs, too.
47 When we speak of free software, we are referring to freedom, not
49 price. Specifically, the General Public License is designed to make
50 sure that you have the freedom to give away or sell copies of free
51 software, that you receive source code or can get it if you want it,
52 that you can change the software or use pieces of it in new free
53 programs; and that you know you can do these things.
54 To protect your rights, we need to make restrictions that forbid
56 anyone to deny you these rights or to ask you to surrender the rights.
57 These restrictions translate to certain responsibilities for you if you
58 distribute copies of the software, or if you modify it.
59 For example, if you distribute copies of a such a program, whether
61 gratis or for a fee, you must give the recipients all the rights that
62 you have. You must make sure that they, too, receive or can get the
63 source code. And you must tell them their rights.
64 We protect your rights with two steps: (1) copyright the software, and
66 (2) offer you this license which gives you legal permission to copy,
67 distribute and/or modify the software.
68 Also, for each author's protection and ours, we want to make certain
70 that everyone understands that there is no warranty for this free
71 software. If the software is modified by someone else and passed on, we
72 want its recipients to know that what they have is not the original, so
73 that any problems introduced by others will not reflect on the original
74 authors' reputations.
75 The precise terms and conditions for copying, distribution and
77 modification follow.
78 GNU GENERAL PUBLIC LICENSE
80 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
81 0. This License Agreement applies to any program or other work which
83 contains a notice placed by the copyright holder saying it may be
84 distributed under the terms of this General Public License. The
85 "Program", below, refers to any such program or work, and a "work based
86 on the Program" means either the Program or any work containing the
87 Program or a portion of it, either verbatim or with modifications. Each
88 licensee is addressed as "you".
89 1. You may copy and distribute verbatim copies of the Program's source
91 code as you receive it, in any medium, provided that you conspicuously and
92 appropriately publish on each copy an appropriate copyright notice and
93 disclaimer of warranty; keep intact all the notices that refer to this
94 General Public License and to the absence of any warranty; and give any
95 other recipients of the Program a copy of this General Public License
96 along with the Program. You may charge a fee for the physical act of
97 transferring a copy.
98 2. You may modify your copy or copies of the Program or any portion of
100 it, and copy and distribute such modifications under the terms of Paragraph
101 1 above, provided that you also do the following:
102 a) cause the modified files to carry prominent notices stating that
104 you changed the files and the date of any change; and
105 b) cause the whole of any work that you distribute or publish, that
107 in whole or in part contains the Program or any part thereof, either
108 with or without modifications, to be licensed at no charge to all
109 third parties under the terms of this General Public License (except
110 that you may choose to grant warranty protection to some or all
111 third parties, at your option).
112 c) If the modified program normally reads commands interactively when
114 run, you must cause it, when started running for such interactive use
115 in the simplest and most usual way, to print or display an
116 announcement including an appropriate copyright notice and a notice
117 that there is no warranty (or else, saying that you provide a
118 warranty) and that users may redistribute the program under these
119 conditions, and telling the user how to view a copy of this General
120 Public License.
121 d) You may charge a fee for the physical act of transferring a
123 copy, and you may at your option offer warranty protection in
124 exchange for a fee.
125 Mere aggregation of another independent work with the Program (or its
127 derivative) on a volume of a storage or distribution medium does not bring
128 the other work under the scope of these terms.
129 3. You may copy and distribute the Program (or a portion or derivative of
131 it, under Paragraph 2) in object code or executable form under the terms of
132 Paragraphs 1 and 2 above provided that you also do one of the following:
133 a) accompany it with the complete corresponding machine-readable
135 source code, which must be distributed under the terms of
136 Paragraphs 1 and 2 above; or,
137 b) accompany it with a written offer, valid for at least three
139 years, to give any third party free (except for a nominal charge
140 for the cost of distribution) a complete machine-readable copy of the
141 corresponding source code, to be distributed under the terms of
142 Paragraphs 1 and 2 above; or,
143 c) accompany it with the information you received as to where the
145 corresponding source code may be obtained. (This alternative is
146 allowed only for noncommercial distribution and only if you
147 received the program in object code or executable form alone.)
148 Source code for a work means the preferred form of the work for making
150 modifications to it. For an executable file, complete source code means
151 all the source code for all modules it contains; but, as a special
152 exception, it need not include source code for modules which are standard
153 libraries that accompany the operating system on which the executable
154 file runs, or for standard header files or definitions files that
155 accompany that operating system.
156 4. You may not copy, modify, sublicense, distribute or transfer the
158 Program except as expressly provided under this General Public License.
159 Any attempt otherwise to copy, modify, sublicense, distribute or transfer
160 the Program is void, and will automatically terminate your rights to use
161 the Program under this License. However, parties who have received
162 copies, or rights to use copies, from you under this General Public
163 License will not have their licenses terminated so long as such parties
164 remain in full compliance.
165 5. By copying, distributing or modifying the Program (or any work based
167 on the Program) you indicate your acceptance of this license to do so,
168 and all its terms and conditions.
169 6. Each time you redistribute the Program (or any work based on the
171 Program), the recipient automatically receives a license from the original
172 licensor to copy, distribute or modify the Program subject to these
173 terms and conditions. You may not impose any further restrictions on the
174 recipients' exercise of the rights granted herein.
175 7. The Free Software Foundation may publish revised and/or new versions
177 of the General Public License from time to time. Such new versions will
178 be similar in spirit to the present version, but may differ in detail to
179 address new problems or concerns.
180 Each version is given a distinguishing version number. If the Program
182 specifies a version number of the license which applies to it and "any
183 later version", you have the option of following the terms and conditions
184 either of that version or of any later version published by the Free
185 Software Foundation. If the Program does not specify a version number of
186 the license, you may choose any version ever published by the Free Software
187 Foundation.
188 8. If you wish to incorporate parts of the Program into other free
190 programs whose distribution conditions are different, write to the author
191 to ask for permission. For software which is copyrighted by the Free
192 Software Foundation, write to the Free Software Foundation; we sometimes
193 make exceptions for this. Our decision will be guided by the two goals
194 of preserving the free status of all derivatives of our free software and
195 of promoting the sharing and reuse of software generally.
196 NO WARRANTY
198 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
200 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
201 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
202 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
203 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
204 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
205 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
206 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
207 REPAIR OR CORRECTION.
208 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
210 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
211 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
212 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
213 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
214 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
215 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
216 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
217 POSSIBILITY OF SUCH DAMAGES.
218 END OF TERMS AND CONDITIONS
220 Appendix: How to Apply These Terms to Your New Programs
222 If you develop a new program, and you want it to be of the greatest
224 possible use to humanity, the best way to achieve this is to make it
225 free software which everyone can redistribute and change under these
226 terms.
227 To do so, attach the following notices to the program. It is safest to
229 attach them to the start of each source file to most effectively convey
230 the exclusion of warranty; and each file should have at least the
231 "copyright" line and a pointer to where the full notice is found.
232 <one line to give the program's name and a brief idea of what it does.>
234 Copyright (C) 19yy <name of author>
235 This program is free software; you can redistribute it and/or modify
237 it under the terms of the GNU General Public License as published by
238 the Free Software Foundation; either version 1, or (at your option)
239 any later version.
240 This program is distributed in the hope that it will be useful,
242 but WITHOUT ANY WARRANTY; without even the implied warranty of
243 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
244 GNU General Public License for more details.
245 You should have received a copy of the GNU General Public License
247 along with this program; if not, write to the Free Software
248 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
249 02110-1301 USA
250 Also add information on how to contact you by electronic and paper mail.
253 If the program is interactive, make it output a short notice like this
255 when it starts in an interactive mode:
256 Gnomovision version 69, Copyright (C) 19xx name of author
258 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
259 This is free software, and you are welcome to redistribute it
260 under certain conditions; type 'show c' for details.
261 The hypothetical commands 'show w' and 'show c' should show the
263 appropriate parts of the General Public License. Of course, the
264 commands you use may be called something other than 'show w' and 'show
265 c'; they could even be mouse-clicks or menu items--whatever suits your
266 program.
267 You should also get your employer (if you work as a programmer) or your
269 school, if any, to sign a "copyright disclaimer" for the program, if
270 necessary. Here a sample; alter the names:
271 Yoyodyne, Inc., hereby disclaims all copyright interest in the
273 program 'Gnomovision' (a program to direct compilers to make passes
274 at assemblers) written by James Hacker.
275 <signature of Ty Coon>, 1 April 1989
277 Ty Coon, President of Vice
278 That's all there is to it!
280perl v5.16.3 2013-03-04 PERLGPL(1)