source: trunk/README @ 1

Revision 1, 59.2 KB checked in by mmamonski, 9 years ago (diff)

Torque/PBS DRMAA initial commit

Line 
1=================================
2DRMAA for Torque/PBS Professional
3=================================
4
5:Authors:       Åukasz Cieśnik <lukasz.ciesnik@fedstage.com>,
6                                Michał Matłoka <michal.matloka@student.put.poznan.pl>,
7                                Mariusz Mamonski <mamonski@man.poznan.pl>
8:Contact:       Mariusz Mamonski <mamonski@man.poznan.pl>
9:Date:          $Date: 2010-07-07 17:05:39 +0200 (Wed, 07 Jul 2010) $
10:Version:       1.0.3
11:Revision:      $Revision: 386 $
12:Copyright:     Copyright (C) 2006-2008 FedStage Systems
13
14:Abstract:  This document describes installation, configuration and usage
15  of `DRMAA for Torque/PBS Pro`_ library (PBS DRMAA for short).
16
17.. meta::
18  :http-equiv=Content-Language: en
19  :http-equiv=Content-Type: application/xhtml+xml; charset=UTF-8
20  :description lang=en: DRMAA implementation for PBS systems.
21  :keywords: DRMAA, PBS, Torque, PBS Professional, PBS Pro, Portable Batch System
22
23.. contents::
24
25.. default-role:: literal
26
27
28Introduction
29============
30
31DRMAA for Torque/PBS Pro is implementation of `Open Grid Forum`_ DRMAA_
32(Distributed Resource Management Application API) specification_ for
33submission and control jobs to PBS_ systems: `PBS Professional`_, Torque_
34and OpenPBS_.  Using DRMAA, grid applications builders, portal developers
35and ISVs can use the same high-level API to link their software with
36different cluster/resource management systems.
37
38This software also enables the integration of `SMOA Computing`_
39with the underlying Torque/PBS Pro system for remote multi-user job submission
40and control over Web Services.
41
42This manual can be found in HTML and PDF formats in ``doc`` directory.
43
44
45Installation
46============
47
48To compile the library just go to main source directory and type::
49
50  $ ./configure [--prefix=/installation/directory] && make
51
52If you had installed PBS in a non standard directory pass it
53in ``--with-pbs`` configure parameter.  There are no unusual requirements
54for basic usage of library: ANSI C compiler and standard make should
55suffice (if linking against PBS Professional you will need also the OpenSSL library). 
56If you have taken sources directly from SVN repository you would
57need additional `developer tools`_. For further information regarding GNU
58build system see the INSTALL file.
59
60For Torque_ it is advised to configure queues so jobs are leaved after
61the completion.  To achieve this simply type the following command for
62all queues which are intended to use with PBS DRMAA::
63
64  # qmgr -c "set queue QUEUE_NAME keep_completed = 60"
65
66The value of the ``keep_completed`` parameter denotes a number of
67seconds jobs will have to wait in the queue after the completion (and
68should be greater then ``pool_delay`` value in PBS DRMAA configuration_).
69It enables the DRMAA library to retrieve the information about finished
70jobs.
71
72Alternatively you can configure the DRMAA library to use Torque server daemon logs
73as information source for terminated jobs (consult next section for details)
74
75Configuration
76=============
77
78During DRMAA session initialization (``drmaa_init``) library tries to read
79its configuration parameters from locations:
80``/etc/pbs_drmaa.conf``, ``~/.pbs_drmaa.conf`` and from file given in
81``PBS_DRMAA_CONF`` environment variable (if set to non-empty string).
82If multiple configuration sources are present then all configurations
83are merged with values from user-defined files taking precedence
84(in following order: ``$PBS_DRMAA_CONF``, ``~/.pbs_drmaa.conf``,
85``/etc/pbs_drmaa.conf``).
86
87Currently recognized configuration parameters are:
88
89  pool_delay
90    Amount of time (in seconds) between successive checks of unfinished job(s).
91
92     Type: integer, Default: 5
93
94  wait_thread
95    Value 1 enables single "wait thread" for updating jobs status.
96    With ``pbs_home`` set enables wait_thread which reads PBS log files (instead of polling PBS daemons).
97     
98     Type: integer, Default: 0
99
100  pbs_home
101    Path to Torque/PBS Pro spool directory that contains server logs (e.g.: /var/spool/pbs).
102   
103     Type: string, Default: not set
104     
105  job_categories
106    Dictionary of job categories.  It's keys are job categories names
107    mapped to `native specification`_ strings.  Attributes set by
108    job category can be overridden by corresponding DRMAA attributes
109    or native specification.  Special category name ``default``
110    is used when ``drmaa_job_category`` job attribute was not set.
111
112  cache_job_state
113    According to the DRMAA specification every `drmaa_job_ps()` call should
114    query DRM system for job state.  With this option one may optimize
115    communication with DRM.  If set to positive integer `drmaa_job_ps()`
116    returns remembered job state without communicating with DRM for
117    `cache_job_state` seconds since last update.  By default library
118    conforms to specification (no caching will be performed).
119
120    Type: integer, default: 0
121
122
123.. table::
124  Different modes of operation
125
126  =========== ========= =========== ======================= ===================================
127  wait_thread pbs_home     mode     keep_completed needed         comments
128  =========== ========= =========== ======================= ===================================
129       0       not set   polling           yes              default configuration
130       1       not set   polling           yes              more effective than above
131       1         set     triggered         no               read access to server logs needed
132  =========== ========= =========== ======================= ===================================
133 
134
135Configuration file syntax
136-------------------------
137
138Configuration file is in form a dictionary.
139Dictionary is set of zero or more key-value pairs.
140Key is a string while value could be a string, an integer
141or another dictionary.
142::
143
144  configuration: dictionary | dictionary_body
145  dictionary: '{' dictionary_body '}'
146  dictionary_body: (string ':' value ',')*
147  value: integer | string | dictionary
148  string: unquoted-string | single-quoted-string | double-quoted-string
149  unquoted-string: [^ \t\n\r:,0-9][^ \t\n\r:,]*
150  single-quoted-string: '[^']*'
151  double-quoted-string: "[^"]*"
152  integer: [0-9]+
153
154Configuration file example
155--------------------------
156
157::
158 
159  # pbs_drmaa.conf - Sample pbs_drmaa configuration file.
160 
161  wait_thread: 0,
162
163  #pool_delay: 5,
164
165  job_categories: {
166        #default: "-k n", # delete output files from execution hosts
167        longterm: "-p -100 -l nice=5",
168        amd64: "-l arch=amd64",
169        python: "-l software=python",
170        java: "-l software=java,vmem=500mb -v PATH=/opt/sun-jdk-1.6:/usr/bin:/bin",
171        #test: "-u test -q testing",
172  },
173 
174
175Native specification
176====================
177
178DRMAA interface allows to pass DRM dependant job submission options.
179Those options may be specified by settings ``drmaa_native_specification``. ``drmaa_native_specification``
180accepts space delimited ``qsub``. ``qsub``
181options which does not set job attributes (`-b`, `-z`, `-C`) as
182well as meant for submission of interactive jobs (`-I`, `-X`) or
183to specify directories (`-d`, `-D`) are *not* supported.
184Also instead of `-W` option following long options are accepted
185within native specification: `--depend`, `--group-list`, `--stagein`
186and `--stageout`.  For detailed description of each option see PBS
187documentation.
188
189Attributes set in native specification overrides corresponding DRMAA job
190attributes.
191
192.. table::
193  Native specification strings with corresponding DRMAA attributes.
194
195  ===================== =============== ============ ====================
196  DRMAA attribute       PBS attribute   PBS resource native specification
197  ===================== =============== ============ ====================
198                      Attributes which get overridden                   
199  -----------------------------------------------------------------------
200  drmaa_job_name        Job_Name                     `-N` job name       
201  drmaa_output_path     Output_Path                  `-o` output path   
202  drmaa_error_path      Error_Path                   `-e` error path     
203  drmaa_join_files      Join_Path                    `-j` join options   
204  drmaa_block_email     Mail_Points                  `-m` mail options   
205  drmaa_start_time      Execution_Time               `-a` start time     
206  drmaa_js_state        Hold_Types                   `-h`               
207  ..                    Account_Name                 `-A` account string
208  ..                    Checkpoint                   `-c` interval       
209  ..                    Keep_Files                   `-k` keep           
210  ..                    Priority                     `-p` priority       
211  ..                    destination                  `-q` queue         
212  ..                    Rerunable                    `-r` y/n           
213  ..                    Shell_Path_List              `-S` path list     
214  ..                    User_List                    `-u` user list     
215  ..                    group_list                   `--group_list=`\groups
216  drmaa_v_env           Variable_List                `-v` variable list 
217  ..                    Variable_List                `-V`               
218  drmaa_v_email         Mail_Users                   `-M` user list     
219  drmaa_duration_hlimit Resource_List   cput         `-l cput=`\limit   
220  drmaa_wct_hlimit      Resource_List   walltime     `-l walltime=`\limit
221  ..                    Resource_List                `-l` resources     
222  ..                    depend                       `--depend=`\dependency
223  ..                    stagein                      `--stagein=`\stagein
224  ..                    stageout                     `--stageout=`\stageout
225  ===================== =============== ============ ====================
226
227
228Release notes
229=============
230
231Changes in 1.0.4 release
232------------------------
233 * fix "mtime" date parsing ('triggered' mode)
234 * fix "submit_args" attribute bug (PBS Professional only)
235
236Changes in 1.0.3 release
237------------------------
238
239 * new implementation of the "wait thread" which reads PBS log files (increased scalability)
240 * support for native specification attribute
241 * memleak fixes
242 * testsuite passed on PBS Pro 10
243 * exit codes 126-127 cause the drmaa_wifaborted() to return true
244 * other bug fixes
245
246Changes in 1.0.2 release
247------------------------
248
249 * automatic reconnect on PBS connection errors
250 * static linkage with DRMAA utilities
251 * other bug fixes
252 
253Changes in 1.0.1 release
254------------------------
255
256 * number of attributes implemented:
257
258   - ``drmaa_start_time``
259   - ``drmaa_duration_hlimit``
260   - ``drmaa_wct_hlimit``
261   - ``drmaa_native_specification``
262   - ``drmaa_job_category``
263
264 * configuration file(s)
265 * separate wait thread
266 * lot of bug fixes
267 * more robust code
268 * separated DRMAA utilities library
269 * Python driven test-suite
270
271
272Known bugs and limitations
273--------------------------
274
275Library covers nearly all DRMAA 1.0 specification_ with exceptions
276listed below.  It passes the `official DRMAA test-suite`_ except of tests
277which require job termination status.  All mandatory and some optional
278job attributes (namely: transfer files, wall clock time hard limit,
279job run duration hard limit) are implemented.
280
281Known limitations imposed by PBS API:
282
283 * With `PBS Pro`_ (and OpenPBS_) retrieving of job termination status is
284   impossible.  For this DRM finished jobs are marked as done with 0
285   return code unless job was terminated through library when they are
286   treated as aborted and killed after receiving SIGTERM.
287
288 * Library accepts job identifiers only of those jobs which
289   were submitted under current session (specification says it should
290   also accept job identifiers from previous sessions and even of
291   jobs submitted in former execution of DRMAA enabled application).
292   This could only be partially fixed as job state needs to be kept by
293   library in order to cope with PBS shortcomings.
294
295 * Job termination (when job is running) is realized by PBS
296   by sending SIGTERM and/or SIGKILL therefore retrieving
297   those signals cannot be distinguished from abort using
298   ``drmaa_control(DRMAA_CONTROL_TERMINATE)``.  Then job termination
299   state is marked as "aborted" and "signaled" whatever is the state.
300
301 * ``drmaa_wcoredump()`` always returns ``false``.
302
303 * Waiting functions (``drmaa_wait()`` and ``drmaa_synchronize()``)
304   must pool DRM to find out whether job finished.
305
306
307Test-suite
308----------
309
310The DRMAA for Torque/PBS Pro library was successfully tested with
311`PBS Pro`_ 10 (10.0.0.82981) and Torque_ 2.5.1 on Linux OS.  Following
312table presents results of tests from
313`Official DRMAA test-suite`_ (originally developed for Sun Grid Engine).
314
315.. table::
316  Mode - Polling
317
318  =============================================== =========== ============
319                  Test name                        PBS Pro 10  Torque 2.5.1
320  =============================================== =========== ============
321  test_mt_exit_during_submit                        passed       passed           
322  test_mt_exit_during_submit_or_wait                passed       passed           
323  test_mt_submit_before_init_wait                   passed       passed           
324  test_mt_submit_mt_wait                            passed       passed           
325  test_mt_submit_wait                               passed       passed           
326  test_st_attribute_change                          passed       passed           
327  test_st_bulk_singlesubmit_wait_individual         passed       passed           
328  test_st_bulk_submit_in_hold_session_delete        passed       passed           
329  test_st_bulk_submit_in_hold_session_release       passed       passed           
330  test_st_bulk_submit_in_hold_single_delete         passed       passed           
331  test_st_bulk_submit_in_hold_single_release        passed       passed           
332  test_st_bulk_submit_wait                          passed       passed           
333  test_st_contact                                   passed       passed           
334  test_st_drm_system                                passed       passed           
335  test_st_drmaa_impl                                passed       passed           
336  test_st_empty_session_control                     passed       passed           
337  test_st_empty_session_synchronize_dispose         passed       passed           
338  test_st_empty_session_synchronize_nodispose       passed       passed           
339  test_st_empty_session_wait                        passed       passed           
340  test_st_error_file_failure                      FAILED [1]_    passed       
341  test_st_exit_status                             FAILED [1]_    passed       
342  test_st_input_file_failure                      FAILED [1]_    passed       
343  test_st_mult_exit                                 passed       passed       
344  test_st_mult_init                                 passed       passed         
345  test_st_output_file_failure                     FAILED [1]_    passed     
346  test_st_submit_in_hold_delete                     passed       passed         
347  test_st_submit_in_hold_release                    passed       passed         
348  test_st_submit_kill_sig                         FAILED [1]_    passed       
349  test_st_submit_polling_synchronize_timeout        passed       passed       
350  test_st_submit_polling_synchronize_zerotimeout    passed       passed       
351  test_st_submit_polling_wait_timeout               passed       passed       
352  test_st_submit_polling_wait_zerotimeout           passed       passed       
353  test_st_submit_suspend_resume_wait                passed       passed       
354  test_st_submit_wait                               passed       passed       
355  test_st_submitmixture_sync_all_dispose            passed       passed     
356  test_st_submitmixture_sync_all_nodispose          passed       passed       
357  test_st_submitmixture_sync_allids_dispose         passed       passed     
358  test_st_submitmixture_sync_allids_nodispose       passed       passed     
359  test_st_supported_attr                            passed       passed   
360  test_st_supported_vattr                           passed       passed   
361  test_st_usage_check                               passed       passed   
362  test_st_version                                   passed       passed   
363  =============================================== =========== ============
364
365.. [1] Due to unavailability of job termination status.
366
367.. table::
368  Mode - Triggered
369
370  =============================================== =========== ============
371                  Test name                        PBS Pro 10  Torque 2.5.1
372  =============================================== =========== ============
373  test_mt_exit_during_submit                        passed       passed           
374  test_mt_exit_during_submit_or_wait                passed       passed           
375  test_mt_submit_before_init_wait                   passed       passed           
376  test_mt_submit_mt_wait                            passed       passed           
377  test_mt_submit_wait                               passed       passed           
378  test_st_attribute_change                          passed       passed           
379  test_st_bulk_singlesubmit_wait_individual         passed       passed           
380  test_st_bulk_submit_in_hold_session_delete        passed       passed           
381  test_st_bulk_submit_in_hold_session_release       passed       passed           
382  test_st_bulk_submit_in_hold_single_delete         passed       passed           
383  test_st_bulk_submit_in_hold_single_release        passed       passed           
384  test_st_bulk_submit_wait                          passed       passed           
385  test_st_contact                                   passed       passed           
386  test_st_drm_system                                passed       passed           
387  test_st_drmaa_impl                                passed       passed           
388  test_st_empty_session_control                     passed       passed           
389  test_st_empty_session_synchronize_dispose         passed       passed           
390  test_st_empty_session_synchronize_nodispose       passed       passed           
391  test_st_empty_session_wait                        passed       passed           
392  test_st_error_file_failure                        passed       passed         
393  test_st_exit_status                               passed       passed       
394  test_st_input_file_failure                        passed       passed       
395  test_st_mult_exit                                 passed       passed       
396  test_st_mult_init                                 passed       passed         
397  test_st_output_file_failure                       passed       passed       
398  test_st_submit_in_hold_delete                     passed       passed         
399  test_st_submit_in_hold_release                    passed       passed         
400  test_st_submit_kill_sig                           passed       passed       
401  test_st_submit_polling_synchronize_timeout        passed       passed       
402  test_st_submit_polling_synchronize_zerotimeout    passed       passed       
403  test_st_submit_polling_wait_timeout               passed       passed       
404  test_st_submit_polling_wait_zerotimeout           passed       passed       
405  test_st_submit_suspend_resume_wait                passed       passed       
406  test_st_submit_wait                               passed       passed       
407  test_st_submitmixture_sync_all_dispose            passed       passed     
408  test_st_submitmixture_sync_all_nodispose          passed       passed       
409  test_st_submitmixture_sync_allids_dispose         passed       passed     
410  test_st_submitmixture_sync_allids_nodispose       passed       passed     
411  test_st_supported_attr                            passed       passed   
412  test_st_supported_vattr                           passed       passed   
413  test_st_usage_check                               passed       passed   
414  test_st_version                                   passed       passed   
415  =============================================== =========== ============
416
417Developers
418==========
419
420Core functionality of DRMAA is put into ``drmaa_utils`` library.
421This library was created in order to keep consistent common functionality
422of `DRMAA for Torque/PBS Pro`_ and other DRMAA libraries.  As it is
423independent from any particular DRM you may found this library useful for
424developing other DRMAAs.
425
426Developer tools
427---------------
428Although not needed for library user the following tools may be required
429if you intend to develop DRMAA for Torque/PBS Pro library or run tests:
430
431 * GNU autotools (autoconf, automake, libtool),
432 * Bison_ parser generator,
433 * gperf_ perfect hash function generator,
434 * Python_ (with development files) for Docutils_ and running test-suite
435   (at least 2.5 version but not Python 3.* which will introduce
436   incompatibilities),
437 * Pyrex_ a Language for writing Python extension modules (>=0.9.6),
438 * Docutils_ for processing this ``README``,
439 * LaTeX_ for creating documentation in PDF format,
440 * Doxygen_ for generating code documentation.
441
442.. _Bison:     http://www.gnu.org/software/bison/
443.. _gperf:     http://www.gnu.org/software/gperf/
444.. _Python:    http://www.python.org/
445.. _Pyrex:     http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/
446.. _Docutils:  http://docutils.sourceforge.net/
447.. _LaTeX:     http://www.latex-project.org/
448.. _Doxygen:   http://www.stack.nl/~dimitri/doxygen/
449
450
451
452Contact
453=======
454
455The DRMAA library for Torque and PBSPro is curently maintained by `Poznan Supercomputing and Networking Center`_. Please send
456your comments, questions and bug reports to:
457
458   Mariusz Mamonski <mamonski@man.poznan.pl>
459
460
461
462
463.. _DRMAA: http://drmaa.org/
464.. _Open Grid Forum: http://www.gridforum.org/
465.. _specification: http://www.ogf.org/documents/GFD.22.pdf
466.. _Official DRMAA test-suite: http://www.drmaa.org/wiki/index.php?pagename=DrmaaTestsuite
467.. _FedStage DRMAA for PBS Pro:
468  http://www.fedstage.com/wiki/FedStage_DRMAA_for_PBS_Pro
469.. _PBS DRMAA: http://www.fedstage.com/wiki/FedStage_DRMAA_for_PBS_Pro
470.. _FedStage Computing: http://www.fedstage.com/wiki/FedStage_Computing
471.. _PBS: http://en.wikipedia.org/wiki/Portable_Batch_System
472.. _PBS Professional: http://www.pbsgridworks.com/
473.. _PBS Pro: http://www.pbsgridworks.com/
474.. _Torque: http://www.clusterresources.com/pages/products/torque-resource-manager.php
475.. _OpenPBS: http://www.openpbs.org/
476.. _Poznan Supercomputing and Networking Center: http://www.man.poznan.pl/online/en/
477
478
479License
480=======
481
482Copyright (C) 2006-2008 FedStage Systems
483
484This program is free software: you can redistribute it and/or modify
485it under the terms of the `GNU General Public License`_ as published
486by the Free Software Foundation, either version 3 of the License, or
487(at your option) any later version.
488
489This program is distributed in the hope that it will be useful,
490but WITHOUT ANY WARRANTY; without even the implied warranty of
491MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
492GNU General Public License for more details.
493
494You should have received a copy of the `GNU General Public License`_
495along with this program.  If not, see <http://www.gnu.org/licenses/>.
496
497
498GNU General Public License
499--------------------------
500Version 3, 29 June 2007
501
502| Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
503| Everyone is permitted to copy and distribute verbatim copies
504| of this license document, but changing it is not allowed.
505
506Preamble
507........
508
509The GNU General Public License is a free, copyleft license for
510software and other kinds of works.
511
512The licenses for most software and other practical works are designed
513to take away your freedom to share and change the works.  By contrast,
514the GNU General Public License is intended to guarantee your freedom to
515share and change all versions of a program--to make sure it remains free
516software for all its users.  We, the Free Software Foundation, use the
517GNU General Public License for most of our software; it applies also to
518any other work released this way by its authors.  You can apply it to
519your programs, too.
520
521When we speak of free software, we are referring to freedom, not
522price.  Our General Public Licenses are designed to make sure that you
523have the freedom to distribute copies of free software (and charge for
524them if you wish), that you receive source code or can get it if you
525want it, that you can change the software or use pieces of it in new
526free programs, and that you know you can do these things.
527
528To protect your rights, we need to prevent others from denying you
529these rights or asking you to surrender the rights.  Therefore, you have
530certain responsibilities if you distribute copies of the software, or if
531you modify it: responsibilities to respect the freedom of others.
532
533For example, if you distribute copies of such a program, whether
534gratis or for a fee, you must pass on to the recipients the same
535freedoms that you received.  You must make sure that they, too, receive
536or can get the source code.  And you must show them these terms so they
537know their rights.
538
539Developers that use the GNU GPL protect your rights with two steps:
540(1) assert copyright on the software, and (2) offer you this License
541giving you legal permission to copy, distribute and/or modify it.
542
543For the developers' and authors' protection, the GPL clearly explains
544that there is no warranty for this free software.  For both users' and
545authors' sake, the GPL requires that modified versions be marked as
546changed, so that their problems will not be attributed erroneously to
547authors of previous versions.
548
549Some devices are designed to deny users access to install or run
550modified versions of the software inside them, although the manufacturer
551can do so.  This is fundamentally incompatible with the aim of
552protecting users' freedom to change the software.  The systematic
553pattern of such abuse occurs in the area of products for individuals to
554use, which is precisely where it is most unacceptable.  Therefore, we
555have designed this version of the GPL to prohibit the practice for those
556products.  If such problems arise substantially in other domains, we
557stand ready to extend this provision to those domains in future versions
558of the GPL, as needed to protect the freedom of users.
559
560Finally, every program is threatened constantly by software patents.
561States should not allow patents to restrict development and use of
562software on general-purpose computers, but in those that do, we wish to
563avoid the special danger that patents applied to a free program could
564make it effectively proprietary.  To prevent this, the GPL assures that
565patents cannot be used to render the program non-free.
566
567The precise terms and conditions for copying, distribution and
568modification follow.
569
570TERMS AND CONDITIONS
571....................
572
5730.  Definitions.
574   
575    "This License" refers to version 3 of the GNU General Public License.
576   
577    "Copyright" also means copyright-like laws that apply to other kinds of
578    works, such as semiconductor masks.
579   
580    "The Program" refers to any copyrightable work licensed under this
581    License.  Each licensee is addressed as "you".  "Licensees" and
582    "recipients" may be individuals or organizations.
583   
584    To "modify" a work means to copy from or adapt all or part of the work
585    in a fashion requiring copyright permission, other than the making of an
586    exact copy.  The resulting work is called a "modified version" of the
587    earlier work or a work "based on" the earlier work.
588   
589    A "covered work" means either the unmodified Program or a work based
590    on the Program.
591   
592    To "propagate" a work means to do anything with it that, without
593    permission, would make you directly or secondarily liable for
594    infringement under applicable copyright law, except executing it on a
595    computer or modifying a private copy.  Propagation includes copying,
596    distribution (with or without modification), making available to the
597    public, and in some countries other activities as well.
598   
599    To "convey" a work means any kind of propagation that enables other
600    parties to make or receive copies.  Mere interaction with a user through
601    a computer network, with no transfer of a copy, is not conveying.
602   
603    An interactive user interface displays "Appropriate Legal Notices"
604    to the extent that it includes a convenient and prominently visible
605    feature that (1) displays an appropriate copyright notice, and (2)
606    tells the user that there is no warranty for the work (except to the
607    extent that warranties are provided), that licensees may convey the
608    work under this License, and how to view a copy of this License.  If
609    the interface presents a list of user commands or options, such as a
610    menu, a prominent item in the list meets this criterion.
611   
6121.  Source Code.
613   
614    The "source code" for a work means the preferred form of the work
615    for making modifications to it.  "Object code" means any non-source
616    form of a work.
617   
618    A "Standard Interface" means an interface that either is an official
619    standard defined by a recognized standards body, or, in the case of
620    interfaces specified for a particular programming language, one that
621    is widely used among developers working in that language.
622   
623    The "System Libraries" of an executable work include anything, other
624    than the work as a whole, that (a) is included in the normal form of
625    packaging a Major Component, but which is not part of that Major
626    Component, and (b) serves only to enable use of the work with that
627    Major Component, or to implement a Standard Interface for which an
628    implementation is available to the public in source code form.  A
629    "Major Component", in this context, means a major essential component
630    (kernel, window system, and so on) of the specific operating system
631    (if any) on which the executable work runs, or a compiler used to
632    produce the work, or an object code interpreter used to run it.
633   
634    The "Corresponding Source" for a work in object code form means all
635    the source code needed to generate, install, and (for an executable
636    work) run the object code and to modify the work, including scripts to
637    control those activities.  However, it does not include the work's
638    System Libraries, or general-purpose tools or generally available free
639    programs which are used unmodified in performing those activities but
640    which are not part of the work.  For example, Corresponding Source
641    includes interface definition files associated with source files for
642    the work, and the source code for shared libraries and dynamically
643    linked subprograms that the work is specifically designed to require,
644    such as by intimate data communication or control flow between those
645    subprograms and other parts of the work.
646   
647    The Corresponding Source need not include anything that users
648    can regenerate automatically from other parts of the Corresponding
649    Source.
650   
651    The Corresponding Source for a work in source code form is that
652    same work.
653   
6542.  Basic Permissions.
655   
656    All rights granted under this License are granted for the term of
657    copyright on the Program, and are irrevocable provided the stated
658    conditions are met.  This License explicitly affirms your unlimited
659    permission to run the unmodified Program.  The output from running a
660    covered work is covered by this License only if the output, given its
661    content, constitutes a covered work.  This License acknowledges your
662    rights of fair use or other equivalent, as provided by copyright law.
663   
664    You may make, run and propagate covered works that you do not
665    convey, without conditions so long as your license otherwise remains
666    in force.  You may convey covered works to others for the sole purpose
667    of having them make modifications exclusively for you, or provide you
668    with facilities for running those works, provided that you comply with
669    the terms of this License in conveying all material for which you do
670    not control copyright.  Those thus making or running the covered works
671    for you must do so exclusively on your behalf, under your direction
672    and control, on terms that prohibit them from making any copies of
673    your copyrighted material outside their relationship with you.
674   
675    Conveying under any other circumstances is permitted solely under
676    the conditions stated below.  Sublicensing is not allowed; section 10
677    makes it unnecessary.
678   
6793.  Protecting Users' Legal Rights From Anti-Circumvention Law.
680   
681    No covered work shall be deemed part of an effective technological
682    measure under any applicable law fulfilling obligations under article
683    11 of the WIPO copyright treaty adopted on 20 December 1996, or
684    similar laws prohibiting or restricting circumvention of such
685    measures.
686   
687    When you convey a covered work, you waive any legal power to forbid
688    circumvention of technological measures to the extent such circumvention
689    is effected by exercising rights under this License with respect to
690    the covered work, and you disclaim any intention to limit operation or
691    modification of the work as a means of enforcing, against the work's
692    users, your or third parties' legal rights to forbid circumvention of
693    technological measures.
694   
6954.  Conveying Verbatim Copies.
696   
697    You may convey verbatim copies of the Program's source code as you
698    receive it, in any medium, provided that you conspicuously and
699    appropriately publish on each copy an appropriate copyright notice;
700    keep intact all notices stating that this License and any
701    non-permissive terms added in accord with section 7 apply to the code;
702    keep intact all notices of the absence of any warranty; and give all
703    recipients a copy of this License along with the Program.
704   
705    You may charge any price or no price for each copy that you convey,
706    and you may offer support or warranty protection for a fee.
707   
7085.  Conveying Modified Source Versions.
709   
710    You may convey a work based on the Program, or the modifications to
711    produce it from the Program, in the form of source code under the
712    terms of section 4, provided that you also meet all of these conditions:
713   
714     a) The work must carry prominent notices stating that you modified
715        it, and giving a relevant date.
716   
717     b) The work must carry prominent notices stating that it is
718        released under this License and any conditions added under section
719        7.  This requirement modifies the requirement in section 4 to
720        "keep intact all notices".
721   
722     c) You must license the entire work, as a whole, under this
723        License to anyone who comes into possession of a copy.  This
724        License will therefore apply, along with any applicable section 7
725        additional terms, to the whole of the work, and all its parts,
726        regardless of how they are packaged.  This License gives no
727        permission to license the work in any other way, but it does not
728        invalidate such permission if you have separately received it.
729   
730     d) If the work has interactive user interfaces, each must display
731        Appropriate Legal Notices; however, if the Program has interactive
732        interfaces that do not display Appropriate Legal Notices, your
733        work need not make them do so.
734   
735    A compilation of a covered work with other separate and independent
736    works, which are not by their nature extensions of the covered work,
737    and which are not combined with it such as to form a larger program,
738    in or on a volume of a storage or distribution medium, is called an
739    "aggregate" if the compilation and its resulting copyright are not
740    used to limit the access or legal rights of the compilation's users
741    beyond what the individual works permit.  Inclusion of a covered work
742    in an aggregate does not cause this License to apply to the other
743    parts of the aggregate.
744   
7456.  Conveying Non-Source Forms.
746   
747    You may convey a covered work in object code form under the terms
748    of sections 4 and 5, provided that you also convey the
749    machine-readable Corresponding Source under the terms of this License,
750    in one of these ways:
751   
752     a) Convey the object code in, or embodied in, a physical product
753        (including a physical distribution medium), accompanied by the
754        Corresponding Source fixed on a durable physical medium
755        customarily used for software interchange.
756   
757     b) Convey the object code in, or embodied in, a physical product
758        (including a physical distribution medium), accompanied by a
759        written offer, valid for at least three years and valid for as
760        long as you offer spare parts or customer support for that product
761        model, to give anyone who possesses the object code either (1) a
762        copy of the Corresponding Source for all the software in the
763        product that is covered by this License, on a durable physical
764        medium customarily used for software interchange, for a price no
765        more than your reasonable cost of physically performing this
766        conveying of source, or (2) access to copy the
767        Corresponding Source from a network server at no charge.
768   
769     c) Convey individual copies of the object code with a copy of the
770        written offer to provide the Corresponding Source.  This
771        alternative is allowed only occasionally and noncommercially, and
772        only if you received the object code with such an offer, in accord
773        with subsection 6b.
774   
775     d) Convey the object code by offering access from a designated
776        place (gratis or for a charge), and offer equivalent access to the
777        Corresponding Source in the same way through the same place at no
778        further charge.  You need not require recipients to copy the
779        Corresponding Source along with the object code.  If the place to
780        copy the object code is a network server, the Corresponding Source
781        may be on a different server (operated by you or a third party)
782        that supports equivalent copying facilities, provided you maintain
783        clear directions next to the object code saying where to find the
784        Corresponding Source.  Regardless of what server hosts the
785        Corresponding Source, you remain obligated to ensure that it is
786        available for as long as needed to satisfy these requirements.
787   
788     e) Convey the object code using peer-to-peer transmission, provided
789        you inform other peers where the object code and Corresponding
790        Source of the work are being offered to the general public at no
791        charge under subsection 6d.
792   
793    A separable portion of the object code, whose source code is excluded
794    from the Corresponding Source as a System Library, need not be
795    included in conveying the object code work.
796   
797    A "User Product" is either (1) a "consumer product", which means any
798    tangible personal property which is normally used for personal, family,
799    or household purposes, or (2) anything designed or sold for incorporation
800    into a dwelling.  In determining whether a product is a consumer product,
801    doubtful cases shall be resolved in favor of coverage.  For a particular
802    product received by a particular user, "normally used" refers to a
803    typical or common use of that class of product, regardless of the status
804    of the particular user or of the way in which the particular user
805    actually uses, or expects or is expected to use, the product.  A product
806    is a consumer product regardless of whether the product has substantial
807    commercial, industrial or non-consumer uses, unless such uses represent
808    the only significant mode of use of the product.
809   
810    "Installation Information" for a User Product means any methods,
811    procedures, authorization keys, or other information required to install
812    and execute modified versions of a covered work in that User Product from
813    a modified version of its Corresponding Source.  The information must
814    suffice to ensure that the continued functioning of the modified object
815    code is in no case prevented or interfered with solely because
816    modification has been made.
817   
818    If you convey an object code work under this section in, or with, or
819    specifically for use in, a User Product, and the conveying occurs as
820    part of a transaction in which the right of possession and use of the
821    User Product is transferred to the recipient in perpetuity or for a
822    fixed term (regardless of how the transaction is characterized), the
823    Corresponding Source conveyed under this section must be accompanied
824    by the Installation Information.  But this requirement does not apply
825    if neither you nor any third party retains the ability to install
826    modified object code on the User Product (for example, the work has
827    been installed in ROM).
828   
829    The requirement to provide Installation Information does not include a
830    requirement to continue to provide support service, warranty, or updates
831    for a work that has been modified or installed by the recipient, or for
832    the User Product in which it has been modified or installed.  Access to a
833    network may be denied when the modification itself materially and
834    adversely affects the operation of the network or violates the rules and
835    protocols for communication across the network.
836   
837    Corresponding Source conveyed, and Installation Information provided,
838    in accord with this section must be in a format that is publicly
839    documented (and with an implementation available to the public in
840    source code form), and must require no special password or key for
841    unpacking, reading or copying.
842   
8437.  Additional Terms.
844   
845    "Additional permissions" are terms that supplement the terms of this
846    License by making exceptions from one or more of its conditions.
847    Additional permissions that are applicable to the entire Program shall
848    be treated as though they were included in this License, to the extent
849    that they are valid under applicable law.  If additional permissions
850    apply only to part of the Program, that part may be used separately
851    under those permissions, but the entire Program remains governed by
852    this License without regard to the additional permissions.
853   
854    When you convey a copy of a covered work, you may at your option
855    remove any additional permissions from that copy, or from any part of
856    it.  (Additional permissions may be written to require their own
857    removal in certain cases when you modify the work.)  You may place
858    additional permissions on material, added by you to a covered work,
859    for which you have or can give appropriate copyright permission.
860   
861    Notwithstanding any other provision of this License, for material you
862    add to a covered work, you may (if authorized by the copyright holders of
863    that material) supplement the terms of this License with terms:
864   
865     a) Disclaiming warranty or limiting liability differently from the
866        terms of sections 15 and 16 of this License; or
867   
868     b) Requiring preservation of specified reasonable legal notices or
869        author attributions in that material or in the Appropriate Legal
870        Notices displayed by works containing it; or
871   
872     c) Prohibiting misrepresentation of the origin of that material, or
873        requiring that modified versions of such material be marked in
874        reasonable ways as different from the original version; or
875   
876     d) Limiting the use for publicity purposes of names of licensors or
877        authors of the material; or
878   
879     e) Declining to grant rights under trademark law for use of some
880        trade names, trademarks, or service marks; or
881   
882     f) Requiring indemnification of licensors and authors of that
883        material by anyone who conveys the material (or modified versions of
884        it) with contractual assumptions of liability to the recipient, for
885        any liability that these contractual assumptions directly impose on
886        those licensors and authors.
887   
888    All other non-permissive additional terms are considered "further
889    restrictions" within the meaning of section 10.  If the Program as you
890    received it, or any part of it, contains a notice stating that it is
891    governed by this License along with a term that is a further
892    restriction, you may remove that term.  If a license document contains
893    a further restriction but permits relicensing or conveying under this
894    License, you may add to a covered work material governed by the terms
895    of that license document, provided that the further restriction does
896    not survive such relicensing or conveying.
897   
898    If you add terms to a covered work in accord with this section, you
899    must place, in the relevant source files, a statement of the
900    additional terms that apply to those files, or a notice indicating
901    where to find the applicable terms.
902   
903    Additional terms, permissive or non-permissive, may be stated in the
904    form of a separately written license, or stated as exceptions;
905    the above requirements apply either way.
906   
9078.  Termination.
908   
909    You may not propagate or modify a covered work except as expressly
910    provided under this License.  Any attempt otherwise to propagate or
911    modify it is void, and will automatically terminate your rights under
912    this License (including any patent licenses granted under the third
913    paragraph of section 11).
914   
915    However, if you cease all violation of this License, then your
916    license from a particular copyright holder is reinstated (a)
917    provisionally, unless and until the copyright holder explicitly and
918    finally terminates your license, and (b) permanently, if the copyright
919    holder fails to notify you of the violation by some reasonable means
920    prior to 60 days after the cessation.
921   
922    Moreover, your license from a particular copyright holder is
923    reinstated permanently if the copyright holder notifies you of the
924    violation by some reasonable means, this is the first time you have
925    received notice of violation of this License (for any work) from that
926    copyright holder, and you cure the violation prior to 30 days after
927    your receipt of the notice.
928   
929    Termination of your rights under this section does not terminate the
930    licenses of parties who have received copies or rights from you under
931    this License.  If your rights have been terminated and not permanently
932    reinstated, you do not qualify to receive new licenses for the same
933    material under section 10.
934   
9359.  Acceptance Not Required for Having Copies.
936   
937    You are not required to accept this License in order to receive or
938    run a copy of the Program.  Ancillary propagation of a covered work
939    occurring solely as a consequence of using peer-to-peer transmission
940    to receive a copy likewise does not require acceptance.  However,
941    nothing other than this License grants you permission to propagate or
942    modify any covered work.  These actions infringe copyright if you do
943    not accept this License.  Therefore, by modifying or propagating a
944    covered work, you indicate your acceptance of this License to do so.
945   
94610. Automatic Licensing of Downstream Recipients.
947   
948    Each time you convey a covered work, the recipient automatically
949    receives a license from the original licensors, to run, modify and
950    propagate that work, subject to this License.  You are not responsible
951    for enforcing compliance by third parties with this License.
952   
953    An "entity transaction" is a transaction transferring control of an
954    organization, or substantially all assets of one, or subdividing an
955    organization, or merging organizations.  If propagation of a covered
956    work results from an entity transaction, each party to that
957    transaction who receives a copy of the work also receives whatever
958    licenses to the work the party's predecessor in interest had or could
959    give under the previous paragraph, plus a right to possession of the
960    Corresponding Source of the work from the predecessor in interest, if
961    the predecessor has it or can get it with reasonable efforts.
962   
963    You may not impose any further restrictions on the exercise of the
964    rights granted or affirmed under this License.  For example, you may
965    not impose a license fee, royalty, or other charge for exercise of
966    rights granted under this License, and you may not initiate litigation
967    (including a cross-claim or counterclaim in a lawsuit) alleging that
968    any patent claim is infringed by making, using, selling, offering for
969    sale, or importing the Program or any portion of it.
970   
97111. Patents.
972   
973    A "contributor" is a copyright holder who authorizes use under this
974    License of the Program or a work on which the Program is based.  The
975    work thus licensed is called the contributor's "contributor version".
976   
977    A contributor's "essential patent claims" are all patent claims
978    owned or controlled by the contributor, whether already acquired or
979    hereafter acquired, that would be infringed by some manner, permitted
980    by this License, of making, using, or selling its contributor version,
981    but do not include claims that would be infringed only as a
982    consequence of further modification of the contributor version.  For
983    purposes of this definition, "control" includes the right to grant
984    patent sublicenses in a manner consistent with the requirements of
985    this License.
986   
987    Each contributor grants you a non-exclusive, worldwide, royalty-free
988    patent license under the contributor's essential patent claims, to
989    make, use, sell, offer for sale, import and otherwise run, modify and
990    propagate the contents of its contributor version.
991   
992    In the following three paragraphs, a "patent license" is any express
993    agreement or commitment, however denominated, not to enforce a patent
994    (such as an express permission to practice a patent or covenant not to
995    sue for patent infringement).  To "grant" such a patent license to a
996    party means to make such an agreement or commitment not to enforce a
997    patent against the party.
998   
999    If you convey a covered work, knowingly relying on a patent license,
1000    and the Corresponding Source of the work is not available for anyone
1001    to copy, free of charge and under the terms of this License, through a
1002    publicly available network server or other readily accessible means,
1003    then you must either (1) cause the Corresponding Source to be so
1004    available, or (2) arrange to deprive yourself of the benefit of the
1005    patent license for this particular work, or (3) arrange, in a manner
1006    consistent with the requirements of this License, to extend the patent
1007    license to downstream recipients.  "Knowingly relying" means you have
1008    actual knowledge that, but for the patent license, your conveying the
1009    covered work in a country, or your recipient's use of the covered work
1010    in a country, would infringe one or more identifiable patents in that
1011    country that you have reason to believe are valid.
1012   
1013    If, pursuant to or in connection with a single transaction or
1014    arrangement, you convey, or propagate by procuring conveyance of, a
1015    covered work, and grant a patent license to some of the parties
1016    receiving the covered work authorizing them to use, propagate, modify
1017    or convey a specific copy of the covered work, then the patent license
1018    you grant is automatically extended to all recipients of the covered
1019    work and works based on it.
1020   
1021    A patent license is "discriminatory" if it does not include within
1022    the scope of its coverage, prohibits the exercise of, or is
1023    conditioned on the non-exercise of one or more of the rights that are
1024    specifically granted under this License.  You may not convey a covered
1025    work if you are a party to an arrangement with a third party that is
1026    in the business of distributing software, under which you make payment
1027    to the third party based on the extent of your activity of conveying
1028    the work, and under which the third party grants, to any of the
1029    parties who would receive the covered work from you, a discriminatory
1030    patent license (a) in connection with copies of the covered work
1031    conveyed by you (or copies made from those copies), or (b) primarily
1032    for and in connection with specific products or compilations that
1033    contain the covered work, unless you entered into that arrangement,
1034    or that patent license was granted, prior to 28 March 2007.
1035   
1036    Nothing in this License shall be construed as excluding or limiting
1037    any implied license or other defenses to infringement that may
1038    otherwise be available to you under applicable patent law.
1039   
104012. No Surrender of Others' Freedom.
1041   
1042    If conditions are imposed on you (whether by court order, agreement or
1043    otherwise) that contradict the conditions of this License, they do not
1044    excuse you from the conditions of this License.  If you cannot convey a
1045    covered work so as to satisfy simultaneously your obligations under this
1046    License and any other pertinent obligations, then as a consequence you may
1047    not convey it at all.  For example, if you agree to terms that obligate you
1048    to collect a royalty for further conveying from those to whom you convey
1049    the Program, the only way you could satisfy both those terms and this
1050    License would be to refrain entirely from conveying the Program.
1051   
105213. Use with the GNU Affero General Public License.
1053   
1054    Notwithstanding any other provision of this License, you have
1055    permission to link or combine any covered work with a work licensed
1056    under version 3 of the GNU Affero General Public License into a single
1057    combined work, and to convey the resulting work.  The terms of this
1058    License will continue to apply to the part which is the covered work,
1059    but the special requirements of the GNU Affero General Public License,
1060    section 13, concerning interaction through a network will apply to the
1061    combination as such.
1062   
106314. Revised Versions of this License.
1064   
1065    The Free Software Foundation may publish revised and/or new versions of
1066    the GNU General Public License from time to time.  Such new versions will
1067    be similar in spirit to the present version, but may differ in detail to
1068    address new problems or concerns.
1069   
1070    Each version is given a distinguishing version number.  If the
1071    Program specifies that a certain numbered version of the GNU General
1072    Public License "or any later version" applies to it, you have the
1073    option of following the terms and conditions either of that numbered
1074    version or of any later version published by the Free Software
1075    Foundation.  If the Program does not specify a version number of the
1076    GNU General Public License, you may choose any version ever published
1077    by the Free Software Foundation.
1078   
1079    If the Program specifies that a proxy can decide which future
1080    versions of the GNU General Public License can be used, that proxy's
1081    public statement of acceptance of a version permanently authorizes you
1082    to choose that version for the Program.
1083   
1084    Later license versions may give you additional or different
1085    permissions.  However, no additional obligations are imposed on any
1086    author or copyright holder as a result of your choosing to follow a
1087    later version.
1088   
108915. Disclaimer of Warranty.
1090   
1091    THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
1092    APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
1093    HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
1094    OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
1095    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1096    PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
1097    IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
1098    ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
1099   
110016. Limitation of Liability.
1101   
1102    IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
1103    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
1104    THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
1105    GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
1106    USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
1107    DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
1108    PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
1109    EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
1110    SUCH DAMAGES.
1111   
111217. Interpretation of Sections 15 and 16.
1113   
1114    If the disclaimer of warranty and limitation of liability provided
1115    above cannot be given local legal effect according to their terms,
1116    reviewing courts shall apply local law that most closely approximates
1117    an absolute waiver of all civil liability in connection with the
1118    Program, unless a warranty or assumption of liability accompanies a
1119    copy of the Program in return for a fee.
1120
1121END OF TERMS AND CONDITIONS
1122
1123How to Apply These Terms to Your New Programs
1124.............................................
1125
1126If you develop a new program, and you want it to be of the greatest
1127possible use to the public, the best way to achieve this is to make it
1128free software which everyone can redistribute and change under these terms.
1129
1130To do so, attach the following notices to the program.  It is safest
1131to attach them to the start of each source file to most effectively
1132state the exclusion of warranty; and each file should have at least
1133the "copyright" line and a pointer to where the full notice is found.
1134::
1135
1136    <one line to give the program's name and a brief idea of what it does.>
1137    Copyright (C) <year>  <name of author>
1138
1139    This program is free software: you can redistribute it and/or modify
1140    it under the terms of the GNU General Public License as published by
1141    the Free Software Foundation, either version 3 of the License, or
1142    (at your option) any later version.
1143
1144    This program is distributed in the hope that it will be useful,
1145    but WITHOUT ANY WARRANTY; without even the implied warranty of
1146    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
1147    GNU General Public License for more details.
1148
1149    You should have received a copy of the GNU General Public License
1150    along with this program.  If not, see <http://www.gnu.org/licenses/>.
1151
1152Also add information on how to contact you by electronic and paper mail.
1153
1154If the program does terminal interaction, make it output a short
1155notice like this when it starts in an interactive mode::
1156
1157    <program>  Copyright (C) <year>  <name of author>
1158    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
1159    This is free software, and you are welcome to redistribute it
1160    under certain conditions; type `show c' for details.
1161
1162The hypothetical commands ``show w`` and ``show c`` should show the
1163appropriate parts of the General Public License.  Of course, your
1164program's commands might be different; for a GUI interface, you would
1165use an "about box".
1166
1167You should also get your employer (if you work as a programmer) or school,
1168if any, to sign a "copyright disclaimer" for the program, if necessary.
1169For more information on this, and how to apply and follow the GNU GPL, see
1170<http://www.gnu.org/licenses/>.
1171
1172The GNU General Public License does not permit incorporating your program
1173into proprietary programs.  If your program is a subroutine library, you
1174may consider it more useful to permit linking proprietary applications with
1175the library.  If this is what you want to do, use the GNU Lesser General
1176Public License instead of this License.  But first, please read
1177<http://www.gnu.org/philosophy/why-not-lgpl.html>.
1178
1179
1180
1181.. role:: raw-html(raw)
1182  :format: html
1183.. role:: raw-latex(raw)
1184  :format: latex
1185.. |--|   unicode:: U+02013 .. en dash
1186  :trim:
1187.. |---|  unicode:: U+02014 .. em dash
1188.. |LaTeX| replace:: :raw-html:`LaTeX` :raw-latex:`\LaTeX{}`
1189
1190.. vim: ft=rest
1191.. vim700: spell spelllang=en
Note: See TracBrowser for help on using the repository browser.