COPYING

GNU GENERAL PUBLIC LICENSE

Version 3, 29 June 2007

Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>

Everyone is permitted to copy and distribute verbatim copies of this license 
document, but changing it is not allowed. 

Preamble

The GNU General Public License is a free, copyleft license for software and other 
kinds of works.

The licenses for most software and other practical works are designed to take away 
your freedom to share and change the works. By contrast, the GNU General Public 
License is intended to guarantee your freedom to share and change all versions of a 
program--to make sure it remains free software for all its users. We, the Free 
Software Foundation, use the GNU General Public License for most of our software; it 
applies also to any other work released this way by its authors. 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 them 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 prevent others from denying you these rights or 
asking you to surrender the rights. Therefore, you have certain responsibilities if 
you distribute copies of the software, or if you modify it: responsibilities to 
respect the freedom of others.

For example, if you distribute copies of such a program, whether gratis or for a fee, 
you must pass on to the recipients the same freedoms that you received. 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.

Developers that use the GNU GPL protect your rights with two steps: (1) assert 
copyright on the software, and (2) offer you this License giving you legal permission 
to copy, distribute and/or modify it.

For the developers' and authors' protection, the GPL clearly explains that there is 
no warranty for this free software. For both users' and authors' sake, the GPL 
requires that modified versions be marked as changed, so that their problems will not 
be attributed erroneously to authors of previous versions.

Some devices are designed to deny users access to install or run modified versions of 
the software inside them, although the manufacturer can do so. This is fundamentally 
incompatible with the aim of protecting users' freedom to change the software. The 
systematic pattern of such abuse occurs in the area of products for individuals to 
use, which is precisely where it is most unacceptable. Therefore, we have designed 
this version of the GPL to prohibit the practice for those products. If such problems 
arise substantially in other domains, we stand ready to extend this provision to 
those domains in future versions of the GPL, as needed to protect the freedom of 
users.

Finally, every program is threatened constantly by software patents. States should 
not allow patents to restrict development and use of software on general-purpose 
computers, but in those that do, we wish to avoid the special danger that patents 
applied to a free program could make it effectively proprietary. To prevent this, the 
GPL assures that patents cannot be used to render the program non-free.

The precise terms and conditions for copying, distribution and modification follow. 

TERMS AND CONDITIONS 

0. Definitions.

"This License" refers to version 3 of the GNU General Public License.

"Copyright" also means copyright-like laws that apply to other kinds of works, such 
as semiconductor masks.

"The Program" refers to any copyrightable work licensed under this License. Each 
licensee is addressed as "you". "Licensees" and "recipients" may be individuals or 
organizations.

To "modify" a work means to copy from or adapt all or part of the work in a fashion 
requiring copyright permission, other than the making of an exact copy. The resulting 
work is called a "modified version" of the earlier work or a work "based on" the 
earlier work.

A "covered work" means either the unmodified Program or a work based on the Program.

To "propagate" a work means to do anything with it that, without permission, would 
make you directly or secondarily liable for infringement under applicable copyright 
law, except executing it on a computer or modifying a private copy. Propagation 
includes copying, distribution (with or without modification), making available to 
the public, and in some countries other activities as well.

To "convey" a work means any kind of propagation that enables other parties to make 
or receive copies. Mere interaction with a user through a computer network, with no 
transfer of a copy, is not conveying.

An interactive user interface displays "Appropriate Legal Notices" to the extent that 
it includes a convenient and prominently visible feature that (1) displays an 
appropriate copyright notice, and (2) tells the user that there is no warranty for 
the work (except to the extent that warranties are provided), that licensees may 
convey the work under this License, and how to view a copy of this License. If the 
interface presents a list of user commands or options, such as a menu, a prominent 
item in the list meets this criterion. 

1. Source Code.

The "source code" for a work means the preferred form of the work for making 
modifications to it. "Object code" means any non-source form of a work.

A "Standard Interface" means an interface that either is an official standard defined 
by a recognized standards body, or, in the case of interfaces specified for a 
particular programming language, one that is widely used among developers working in 
that language.

The "System Libraries" of an executable work include anything, other than the work as 
a whole, that (a) is included in the normal form of packaging a Major Component, but 
which is not part of that Major Component, and (b) serves only to enable use of the 
work with that Major Component, or to implement a Standard Interface for which an 
implementation is available to the public in source code form. A "Major Component", 
in this context, means a major essential component (kernel, window system, and so on) 
of the specific operating system (if any) on which the executable work runs, or a 
compiler used to produce the work, or an object code interpreter used to run it.

The "Corresponding Source" for a work in object code form means all the source code 
needed to generate, install, and (for an executable work) run the object code and to 
modify the work, including scripts to control those activities. However, it does not 
include the work's System Libraries, or general-purpose tools or generally available 
free programs which are used unmodified in performing those activities but which are 
not part of the work. For example, Corresponding Source includes interface definition 
files associated with source files for the work, and the source code for shared 
libraries and dynamically linked subprograms that the work is specifically designed 
to require, such as by intimate data communication or control flow between those 
subprograms and other parts of the work.

The Corresponding Source need not include anything that users can regenerate 
automatically from other parts of the Corresponding Source.

The Corresponding Source for a work in source code form is that same work. 

2. Basic Permissions.

All rights granted under this License are granted for the term of copyright on the 
Program, and are irrevocable provided the stated conditions are met. This License 
explicitly affirms your unlimited permission to run the unmodified Program. The 
output from running a covered work is covered by this License only if the output, 
given its content, constitutes a covered work. This License acknowledges your rights 
of fair use or other equivalent, as provided by copyright law.

You may make, run and propagate covered works that you do not convey, without 
conditions so long as your license otherwise remains in force. You may convey covered 
works to others for the sole purpose of having them make modifications exclusively 
for you, or provide you with facilities for running those works, provided that you 
comply with the terms of this License in conveying all material for which you do not 
control copyright. Those thus making or running the covered works for you must do so 
exclusively on your behalf, under your direction and control, on terms that prohibit 
them from making any copies of your copyrighted material outside their relationship 
with you.

Conveying under any other circumstances is permitted solely under the conditions 
stated below. Sublicensing is not allowed; section 10 makes it unnecessary. 

3. Protecting Users' Legal Rights From Anti-Circumvention Law.

No covered work shall be deemed part of an effective technological measure under any 
applicable law fulfilling obligations under article 11 of the WIPO copyright treaty 
adopted on 20 December 1996, or similar laws prohibiting or restricting circumvention 
of such measures.

When you convey a covered work, you waive any legal power to forbid circumvention of 
technological measures to the extent such circumvention is effected by exercising 
rights under this License with respect to the covered work, and you disclaim any 
intention to limit operation or modification of the work as a means of enforcing, 
against the work's users, your or third parties' legal rights to forbid circumvention 
of technological measures. 

4. Conveying Verbatim Copies.

You may convey verbatim copies of the Program's source code as you receive it, in any 
medium, provided that you conspicuously and appropriately publish on each copy an 
appropriate copyright notice; keep intact all notices stating that this License and 
any non-permissive terms added in accord with section 7 apply to the code; keep 
intact all notices of the absence of any warranty; and give all recipients a copy of 
this License along with the Program.

You may charge any price or no price for each copy that you convey, and you may offer 
support or warranty protection for a fee. 

5. Conveying Modified Source Versions.

You may convey a work based on the Program, or the modifications to produce it from 
the Program, in the form of source code under the terms of section 4, provided that 
you also meet all of these conditions:

    a) The work must carry prominent notices stating that you modified it, and giving 
a relevant date.
    b) The work must carry prominent notices stating that it is released under this 
License and any conditions added under section 7. This requirement modifies the 
requirement in section 4 to "keep intact all notices".
    c) You must license the entire work, as a whole, under this License to anyone who 
comes into possession of a copy. This License will therefore apply, along with any 
applicable section 7 additional terms, to the whole of the work, and all its parts, 
regardless of how they are packaged. This License gives no permission to license the 
work in any other way, but it does not invalidate such permission if you have 
separately received it.
    d) If the work has interactive user interfaces, each must display Appropriate 
Legal Notices; however, if the Program has interactive interfaces that do not display 
Appropriate Legal Notices, your work need not make them do so.

A compilation of a covered work with other separate and independent works, which are 
not by their nature extensions of the covered work, and which are not combined with 
it such as to form a larger program, in or on a volume of a storage or distribution 
medium, is called an "aggregate" if the compilation and its resulting copyright are 
not used to limit the access or legal rights of the compilation's users beyond what 
the individual works permit. Inclusion of a covered work in an aggregate does not 
cause this License to apply to the other parts of the aggregate. 

6. Conveying Non-Source Forms.

You may convey a covered work in object code form under the terms of sections 4 and 
5, provided that you also convey the machine-readable Corresponding Source under the 
terms of this License, in one of these ways:

    a) Convey the object code in, or embodied in, a physical product (including a 
physical distribution medium), accompanied by the Corresponding Source fixed on a 
durable physical medium customarily used for software interchange.
    b) Convey the object code in, or embodied in, a physical product (including a 
physical distribution medium), accompanied by a written offer, valid for at least 
three years and valid for as long as you offer spare parts or customer support for 
that product model, to give anyone who possesses the object code either (1) a copy of 
the Corresponding Source for all the software in the product that is covered by this 
License, on a durable physical medium customarily used for software interchange, for 
a price no more than your reasonable cost of physically performing this conveying of 
source, or (2) access to copy the Corresponding Source from a network server at no 
charge.
    c) Convey individual copies of the object code with a copy of the written offer 
to provide the Corresponding Source. This alternative is allowed only occasionally 
and noncommercially, and only if you received the object code with such an offer, in 
accord with subsection 6b.
    d) Convey the object code by offering access from a designated place (gratis or 
for a charge), and offer equivalent access to the Corresponding Source in the same 
way through the same place at no further charge. You need not require recipients to 
copy the Corresponding Source along with the object code. If the place to copy the 
object code is a network server, the Corresponding Source may be on a different 
server (operated by you or a third party) that supports equivalent copying 
facilities, provided you maintain clear directions next to the object code saying 
where to find the Corresponding Source. Regardless of what server hosts the 
Corresponding Source, you remain obligated to ensure that it is available for as long 
as needed to satisfy these requirements.
    e) Convey the object code using peer-to-peer transmission, provided you inform 
other peers where the object code and Corresponding Source of the work are being 
offered to the general public at no charge under subsection 6d.

A separable portion of the object code, whose source code is excluded from the 
Corresponding Source as a System Library, need not be included in conveying the 
object code work.

A "User Product" is either (1) a "consumer product", which means any tangible 
personal property which is normally used for personal, family, or household purposes, 
or (2) anything designed or sold for incorporation into a dwelling. In determining 
whether a product is a consumer product, doubtful cases shall be resolved in favor of 
coverage. For a particular product received by a particular user, "normally used" 
refers to a typical or common use of that class of product, regardless of the status 
of the particular user or of the way in which the particular user actually uses, or 
expects or is expected to use, the product. A product is a consumer product 
regardless of whether the product has substantial commercial, industrial or 
non-consumer uses, unless such uses represent the only significant mode of use of the 
product.

"Installation Information" for a User Product means any methods, procedures, 
authorization keys, or other information required to install and execute modified 
versions of a covered work in that User Product from a modified version of its 
Corresponding Source. The information must suffice to ensure that the continued 
functioning of the modified object code is in no case prevented or interfered with 
solely because modification has been made.

If you convey an object code work under this section in, or with, or specifically for 
use in, a User Product, and the conveying occurs as part of a transaction in which 
the right of possession and use of the User Product is transferred to the recipient 
in perpetuity or for a fixed term (regardless of how the transaction is 
characterized), the Corresponding Source conveyed under this section must be 
accompanied by the Installation Information. But this requirement does not apply if 
neither you nor any third party retains the ability to install modified object code 
on the User Product (for example, the work has been installed in ROM).

The requirement to provide Installation Information does not include a requirement to 
continue to provide support service, warranty, or updates for a work that has been 
modified or installed by the recipient, or for the User Product in which it has been 
modified or installed. Access to a network may be denied when the modification itself 
materially and adversely affects the operation of the network or violates the rules 
and protocols for communication across the network.

Corresponding Source conveyed, and Installation Information provided, in accord with 
this section must be in a format that is publicly documented (and with an 
implementation available to the public in source code form), and must require no 
special password or key for unpacking, reading or copying. 

7. Additional Terms.

"Additional permissions" are terms that supplement the terms of this License by 
making exceptions from one or more of its conditions. Additional permissions that are 
applicable to the entire Program shall be treated as though they were included in 
this License, to the extent that they are valid under applicable law. If additional 
permissions apply only to part of the Program, that part may be used separately under 
those permissions, but the entire Program remains governed by this License without 
regard to the additional permissions.

When you convey a copy of a covered work, you may at your option remove any 
additional permissions from that copy, or from any part of it. (Additional 
permissions may be written to require their own removal in certain cases when you 
modify the work.) You may place additional permissions on material, added by you to a 
covered work, for which you have or can give appropriate copyright permission.

Notwithstanding any other provision of this License, for material you add to a 
covered work, you may (if authorized by the copyright holders of that material) 
supplement the terms of this License with terms:

    a) Disclaiming warranty or limiting liability differently from the terms of 
sections 15 and 16 of this License; or
    b) Requiring preservation of specified reasonable legal notices or author 
attributions in that material or in the Appropriate Legal Notices displayed by works 
containing it; or
    c) Prohibiting misrepresentation of the origin of that material, or requiring 
that modified versions of such material be marked in reasonable ways as different 
from the original version; or
    d) Limiting the use for publicity purposes of names of licensors or authors of 
the material; or
    e) Declining to grant rights under trademark law for use of some trade names, 
trademarks, or service marks; or
    f) Requiring indemnification of licensors and authors of that material by anyone 
who conveys the material (or modified versions of it) with contractual assumptions of 
liability to the recipient, for any liability that these contractual assumptions 
directly impose on those licensors and authors.

All other non-permissive additional terms are considered "further restrictions" 
within the meaning of section 10. If the Program as you received it, or any part of 
it, contains a notice stating that it is governed by this License along with a term 
that is a further restriction, you may remove that term. If a license document 
contains a further restriction but permits relicensing or conveying under this 
License, you may add to a covered work material governed by the terms of that license 
document, provided that the further restriction does not survive such relicensing or 
conveying.

If you add terms to a covered work in accord with this section, you must place, in 
the relevant source files, a statement of the additional terms that apply to those 
files, or a notice indicating where to find the applicable terms.

Additional terms, permissive or non-permissive, may be stated in the form of a 
separately written license, or stated as exceptions; the above requirements apply 
either way. 

8. Termination.

You may not propagate or modify a covered work except as expressly provided under 
this License. Any attempt otherwise to propagate or modify it is void, and will 
automatically terminate your rights under this License (including any patent licenses 
granted under the third paragraph of section 11).

However, if you cease all violation of this License, then your license from a 
particular copyright holder is reinstated (a) provisionally, unless and until the 
copyright holder explicitly and finally terminates your license, and (b) permanently, 
if the copyright holder fails to notify you of the violation by some reasonable means 
prior to 60 days after the cessation.

Moreover, your license from a particular copyright holder is reinstated permanently 
if the copyright holder notifies you of the violation by some reasonable means, this 
is the first time you have received notice of violation of this License (for any 
work) from that copyright holder, and you cure the violation prior to 30 days after 
your receipt of the notice.

Termination of your rights under this section does not terminate the licenses of 
parties who have received copies or rights from you under this License. If your 
rights have been terminated and not permanently reinstated, you do not qualify to 
receive new licenses for the same material under section 10. 

9. Acceptance Not Required for Having Copies.

You are not required to accept this License in order to receive or run a copy of the 
Program. Ancillary propagation of a covered work occurring solely as a consequence of 
using peer-to-peer transmission to receive a copy likewise does not require 
acceptance. However, nothing other than this License grants you permission to 
propagate or modify any covered work. These actions infringe copyright if you do not 
accept this License. Therefore, by modifying or propagating a covered work, you 
indicate your acceptance of this License to do so. 

10. Automatic Licensing of Downstream Recipients.

Each time you convey a covered work, the recipient automatically receives a license 
from the original licensors, to run, modify and propagate that work, subject to this 
License. You are not responsible for enforcing compliance by third parties with this 
License.

An "entity transaction" is a transaction transferring control of an organization, or 
substantially all assets of one, or subdividing an organization, or merging 
organizations. If propagation of a covered work results from an entity transaction, 
each party to that transaction who receives a copy of the work also receives whatever 
licenses to the work the party's predecessor in interest had or could give under the 
previous paragraph, plus a right to possession of the Corresponding Source of the 
work from the predecessor in interest, if the predecessor has it or can get it with 
reasonable efforts.

You may not impose any further restrictions on the exercise of the rights granted or 
affirmed under this License. For example, you may not impose a license fee, royalty, 
or other charge for exercise of rights granted under this License, and you may not 
initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging 
that any patent claim is infringed by making, using, selling, offering for sale, or 
importing the Program or any portion of it. 

11. Patents.

A "contributor" is a copyright holder who authorizes use under this License of the 
Program or a work on which the Program is based. The work thus licensed is called the 
contributor's "contributor version".

A contributor's "essential patent claims" are all patent claims owned or controlled 
by the contributor, whether already acquired or hereafter acquired, that would be 
infringed by some manner, permitted by this License, of making, using, or selling its 
contributor version, but do not include claims that would be infringed only as a 
consequence of further modification of the contributor version. For purposes of this 
definition, "control" includes the right to grant patent sublicenses in a manner 
consistent with the requirements of this License.

Each contributor grants you a non-exclusive, worldwide, royalty-free patent license 
under the contributor's essential patent claims, to make, use, sell, offer for sale, 
import and otherwise run, modify and propagate the contents of its contributor 
version.

In the following three paragraphs, a "patent license" is any express agreement or 
commitment, however denominated, not to enforce a patent (such as an express 
permission to practice a patent or covenant not to sue for patent infringement). To 
"grant" such a patent license to a party means to make such an agreement or 
commitment not to enforce a patent against the party.

If you convey a covered work, knowingly relying on a patent license, and the 
Corresponding Source of the work is not available for anyone to copy, free of charge 
and under the terms of this License, through a publicly available network server or 
other readily accessible means, then you must either (1) cause the Corresponding 
Source to be so available, or (2) arrange to deprive yourself of the benefit of the 
patent license for this particular work, or (3) arrange, in a manner consistent with 
the requirements of this License, to extend the patent license to downstream 
recipients. "Knowingly relying" means you have actual knowledge that, but for the 
patent license, your conveying the covered work in a country, or your recipient's use 
of the covered work in a country, would infringe one or more identifiable patents in 
that country that you have reason to believe are valid.

If, pursuant to or in connection with a single transaction or arrangement, you 
convey, or propagate by procuring conveyance of, a covered work, and grant a patent 
license to some of the parties receiving the covered work authorizing them to use, 
propagate, modify or convey a specific copy of the covered work, then the patent 
license you grant is automatically extended to all recipients of the covered work and 
works based on it.

A patent license is "discriminatory" if it does not include within the scope of its 
coverage, prohibits the exercise of, or is conditioned on the non-exercise of one or 
more of the rights that are specifically granted under this License. You may not 
convey a covered work if you are a party to an arrangement with a third party that is 
in the business of distributing software, under which you make payment to the third 
party based on the extent of your activity of conveying the work, and under which the 
third party grants, to any of the parties who would receive the covered work from 
you, a discriminatory patent license (a) in connection with copies of the covered 
work conveyed by you (or copies made from those copies), or (b) primarily for and in 
connection with specific products or compilations that contain the covered work, 
unless you entered into that arrangement, or that patent license was granted, prior 
to 28 March 2007.

Nothing in this License shall be construed as excluding or limiting any implied 
license or other defenses to infringement that may otherwise be available to you 
under applicable patent law. 

12. No Surrender of Others' Freedom.

If conditions are imposed on you (whether by court order, agreement or otherwise) 
that contradict the conditions of this License, they do not excuse you from the 
conditions of this License. If you cannot convey a covered work so as to satisfy 
simultaneously your obligations under this License and any other pertinent 
obligations, then as a consequence you may not convey it at all. For example, if you 
agree to terms that obligate you to collect a royalty for further conveying from 
those to whom you convey the Program, the only way you could satisfy both those terms 
and this License would be to refrain entirely from conveying the Program. 

13. Use with the GNU Affero General Public License.

Notwithstanding any other provision of this License, you have permission to link or 
combine any covered work with a work licensed under version 3 of the GNU Affero 
General Public License into a single combined work, and to convey the resulting work. 
The terms of this License will continue to apply to the part which is the covered 
work, but the special requirements of the GNU Affero General Public License, section 
13, concerning interaction through a network will apply to the combination as such. 

14. Revised Versions of this License.

The Free Software Foundation may publish revised and/or new versions of the GNU 
General Public License from time to time. Such new versions will be similar in spirit 
to the present version, but may differ in detail to address new problems or concerns.

Each version is given a distinguishing version number. If the Program specifies that 
a certain numbered version of the GNU General Public License "or any later version" 
applies to it, you have the option of following the terms and conditions either of 
that numbered version or of any later version published by the Free Software 
Foundation. If the Program does not specify a version number of the GNU General 
Public License, you may choose any version ever published by the Free Software 
Foundation.

If the Program specifies that a proxy can decide which future versions of the GNU 
General Public License can be used, that proxy's public statement of acceptance of a 
version permanently authorizes you to choose that version for the Program.

Later license versions may give you additional or different permissions. However, no 
additional obligations are imposed on any author or copyright holder as a result of 
your choosing to follow a later version. 

15. Disclaimer of Warranty.

THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR 
IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 
OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST 
OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 

16. Limitation of Liability.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY 
COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS 
PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, 
INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE 
PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE 
OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE 
WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16.

If the disclaimer of warranty and limitation of liability provided above cannot be 
given local legal effect according to their terms, reviewing courts shall apply local 
law that most closely approximates an absolute waiver of all civil liability in 
connection with the Program, unless a warranty or assumption of liability accompanies 
a copy of the Program in return for a fee.

END OF TERMS AND CONDITIONS