perlgpl.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "PERLGPL 1"
.TH PERLGPL 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
perlgpl \- the GNU General Public License, version 2
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& You can refer to this document in Pod via "L<perlgpl>"
\& Or you can see this document by entering "perldoc perlgpl"
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is \fB\*(L"The \s-1GNU\s0 General Public License, version 2\*(R"\fR.  It's here so
that modules, programs, etc., that want to declare this as their
distribution license, can link to it.
.PP
It is also one of the two licenses Perl allows itself to be
redistributed and/or modified; for the other one, the Perl Artistic
License, see the perlartistic.
.SH "GNU GENERAL PUBLIC LICENSE"
.IX Header "GNU GENERAL PUBLIC LICENSE"
.Vb 2
\&                    GNU GENERAL PUBLIC LICENSE
\&                       Version 2, June 1991
\&
\& Copyright (C) 1989, 1991 Free Software Foundation, Inc.
\&                       51 Franklin Street, Fifth Floor, Boston, MA  02110\-1301, USA
\& Everyone is permitted to copy and distribute verbatim copies
\& of this license document, but changing it is not allowed.
\&
\&                            Preamble
\&
\&  The licenses for most software are designed to take away your
\&freedom to share and change it.  By contrast, the GNU General Public
\&License is intended to guarantee your freedom to share and change free
\&software\-\-to make sure the software is free for all its users.  This
\&General Public License applies to most of the Free Software
\&Foundation\*(Aqs software and to any other program whose authors commit to
\&using it.  (Some other Free Software Foundation software is covered by
\&the GNU Library General Public License instead.)  You can apply it to
\&your programs, too.
\&
\&  When we speak of free software, we are referring to freedom, not
\&price.  Our General Public Licenses are designed to make sure that you
\&have the freedom to distribute copies of free software (and charge for
\&this service if you wish), that you receive source code or can get it
\&if you want it, that you can change the software or use pieces of it
\&in new free programs; and that you know you can do these things.
\&
\&  To protect your rights, we need to make restrictions that forbid
\&anyone to deny you these rights or to ask you to surrender the rights.
\&These restrictions translate to certain responsibilities for you if you
\&distribute copies of the software, or if you modify it.
\&
\&  For example, if you distribute copies of such a program, whether
\&gratis or for a fee, you must give the recipients all the rights that
\&you have.  You must make sure that they, too, receive or can get the
\&source code.  And you must show them these terms so they know their
\&rights.
\&
\&  We protect your rights with two steps: (1) copyright the software, and
\&(2) offer you this license which gives you legal permission to copy,
\&distribute and/or modify the software.
\&
\&  Also, for each author\*(Aqs protection and ours, we want to make certain
\&that everyone understands that there is no warranty for this free
\&software.  If the software is modified by someone else and passed on, we
\&want its recipients to know that what they have is not the original, so
\&that any problems introduced by others will not reflect on the original
\&authors\*(Aq reputations.
\&
\&  Finally, any free program is threatened constantly by software
\&patents.  We wish to avoid the danger that redistributors of a free
\&program will individually obtain patent licenses, in effect making the
\&program proprietary.  To prevent this, we have made it clear that any
\&patent must be licensed for everyone\*(Aqs free use or not licensed at all.
\&
\&  The precise terms and conditions for copying, distribution and
\&modification follow.
\&
\&                    GNU GENERAL PUBLIC LICENSE
\&   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
\&
\&  0. This License applies to any program or other work which contains
\&a notice placed by the copyright holder saying it may be distributed
\&under the terms of this General Public License.  The "Program", below,
\&refers to any such program or work, and a "work based on the Program"
\&means either the Program or any derivative work under copyright law:
\&that is to say, a work containing the Program or a portion of it,
\&either verbatim or with modifications and/or translated into another
\&language.  (Hereinafter, translation is included without limitation in
\&the term "modification".)  Each licensee is addressed as "you".
.Ve
.PP
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
.PP
.Vb 7
\&  1. You may copy and distribute verbatim copies of the Program\*(Aqs
\&source code as you receive it, in any medium, provided that you
\&conspicuously and appropriately publish on each copy an appropriate
\&copyright notice and disclaimer of warranty; keep intact all the
\&notices that refer to this License and to the absence of any warranty;
\&and give any other recipients of the Program a copy of this License
\&along with the Program.
.Ve
.PP
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
.PP
.Vb 4
\&  2. You may modify your copy or copies of the Program or any portion
\&of it, thus forming a work based on the Program, and copy and
\&distribute such modifications or work under the terms of Section 1
\&above, provided that you also meet all of these conditions:
\&
\&    a) You must cause the modified files to carry prominent notices
\&    stating that you changed the files and the date of any change.
\&
\&    b) You must cause any work that you distribute or publish, that in