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,
66 and (2) offer you this license which gives you legal permission to
67 copy, 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,
72 we want its recipients to know that what they have is not the original,
73 so that any problems introduced by others will not reflect on the
74 original 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.
88 Each licensee is addressed as "you".
89 1. You may copy and distribute verbatim copies of the Program's
91 source code as you receive it, in any medium, provided that you
92 conspicuously and appropriately publish on each copy an appropriate
93 copyright notice and disclaimer of warranty; keep intact all the
94 notices that refer to this General Public License and to the absence of
95 any warranty; and give any other recipients of the Program a copy of
96 this General Public License along with the Program. You may charge a
97 fee for the physical act of transferring a copy.
98 2. You may modify your copy or copies of the Program or any portion
100 of it, and copy and distribute such modifications under the terms of
101 Paragraph 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,
108 either with or without modifications, to be licensed at no charge
109 to all third parties under the terms of this General Public License
110 (except that you may choose to grant warranty protection to some or
111 all third parties, at your option).
112 c) If the modified program normally reads commands interactively
114 when run, you must cause it, when started running for such
115 interactive use in the simplest and most usual way, to print or
116 display an announcement including an appropriate copyright notice
117 and a notice that there is no warranty (or else, saying that you
118 provide a warranty) and that users may redistribute the program
119 under these conditions, and telling the user how to view a copy of
120 this General 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
128 bring the other work under the scope of these terms.
129 3. You may copy and distribute the Program (or a portion or
131 derivative of it, under Paragraph 2) in object code or executable form
132 under the terms of Paragraphs 1 and 2 above provided that you also do
133 one of the following:
134 a) accompany it with the complete corresponding machine-readable
136 source code, which must be distributed under the terms of
137 Paragraphs 1 and 2 above; or,
138 b) accompany it with a written offer, valid for at least three
140 years, to give any third party free (except for a nominal charge
141 for the cost of distribution) a complete machine-readable copy of
142 the corresponding source code, to be distributed under the terms of
143 Paragraphs 1 and 2 above; or,
144 c) accompany it with the information you received as to where the
146 corresponding source code may be obtained. (This alternative is
147 allowed only for noncommercial distribution and only if you
148 received the program in object code or executable form alone.)
149 Source code for a work means the preferred form of the work for making
151 modifications to it. For an executable file, complete source code
152 means all the source code for all modules it contains; but, as a
153 special exception, it need not include source code for modules which
154 are standard libraries that accompany the operating system on which the
155 executable file runs, or for standard header files or definitions files
156 that accompany that operating system.
157 4. You may not copy, modify, sublicense, distribute or transfer the
159 Program except as expressly provided under this General Public License.
160 Any attempt otherwise to copy, modify, sublicense, distribute or
161 transfer the Program is void, and will automatically terminate your
162 rights to use the Program under this License. However, parties who
163 have received copies, or rights to use copies, from you under this
164 General Public License will not have their licenses terminated so long
165 as such parties remain in full compliance.
166 5. By copying, distributing or modifying the Program (or any work
168 based on the Program) you indicate your acceptance of this license to
169 do so, and all its terms and conditions.
170 6. Each time you redistribute the Program (or any work based on the
172 Program), the recipient automatically receives a license from the
173 original licensor to copy, distribute or modify the Program subject to
174 these terms and conditions. You may not impose any further
175 restrictions on the recipients' exercise of the rights granted herein.
176 7. The Free Software Foundation may publish revised and/or new
178 versions of the General Public License from time to time. Such new
179 versions will be similar in spirit to the present version, but may
180 differ in detail to address new problems or concerns.
181 Each version is given a distinguishing version number. If the Program
183 specifies a version number of the license which applies to it and "any
184 later version", you have the option of following the terms and
185 conditions either of that version or of any later version published by
186 the Free Software Foundation. If the Program does not specify a
187 version number of the license, you may choose any version ever
188 published by the Free Software Foundation.
189 8. If you wish to incorporate parts of the Program into other free
191 programs whose distribution conditions are different, write to the
192 author to ask for permission. For software which is copyrighted by the
193 Free Software Foundation, write to the Free Software Foundation; we
194 sometimes make exceptions for this. Our decision will be guided by the
195 two goals of preserving the free status of all derivatives of our free
196 software and of promoting the sharing and reuse of software generally.
197 NO WARRANTY
199 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
201 WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
202 EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
203 OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND,
204 EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
205 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
206 THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS
207 WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
208 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
209 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
211 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
212 AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
213 FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
214 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
215 PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
216 RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
217 FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF
218 SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
219 DAMAGES.
220 END OF TERMS AND CONDITIONS
222 Appendix: How to Apply These Terms to Your New Programs
224 If you develop a new program, and you want it to be of the greatest
226 possible use to humanity, the best way to achieve this is to make it
227 free software which everyone can redistribute and change under these
228 terms.
229 To do so, attach the following notices to the program. It is safest
231 to attach them to the start of each source file to most effectively
232 convey the exclusion of warranty; and each file should have at least
233 the "copyright" line and a pointer to where the full notice is found.
234 <one line to give the program's name and a brief idea of what it
236 does.>
237 Copyright (C) 19yy <name of author>
238 This program is free software; you can redistribute it and/or
240 modify it under the terms of the GNU General Public License as
241 published by the Free Software Foundation; either version 1, or (at
242 your option) any later version.
243 This program is distributed in the hope that it will be useful,
245 but WITHOUT ANY WARRANTY; without even the implied warranty of
246 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
247 GNU General Public License for more details.
248 You should have received a copy of the GNU General Public License
250 along with this program; if not, write to the Free Software
251 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
252 02110-1301 USA
253 Also add information on how to contact you by electronic and paper
256 mail.
257 If the program is interactive, make it output a short notice like this
259 when it starts in an interactive mode:
260 Gnomovision version 69, Copyright (C) 19xx name of author
262 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type
263 'show w'. This is free software, and you are welcome to
264 redistribute it under certain conditions; type 'show c' for
265 details.
266 The hypothetical commands 'show w' and 'show c' should show the
268 appropriate parts of the General Public License. Of course, the
269 commands you use may be called something other than 'show w' and 'show
270 c'; they could even be mouse-clicks or menu items--whatever suits your
271 program.
272 You should also get your employer (if you work as a programmer) or your
274 school, if any, to sign a "copyright disclaimer" for the program, if
275 necessary. Here a sample; alter the names:
276 Yoyodyne, Inc., hereby disclaims all copyright interest in the
278 program 'Gnomovision' (a program to direct compilers to make passes
279 at assemblers) written by James Hacker.
280 <signature of Ty Coon>, 1 April 1989
282 Ty Coon, President of Vice
283 That's all there is to it!
285perl v5.28.2 2018-03-01 PERLGPL(1)