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# Contributor Code of Conduct
As contributors and maintainers of this project, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities.
We are committed to making participation in this project a harassment-free experience for everyone, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, or religion.
Examples of unacceptable behavior by participants include the use of sexual language or imagery, derogatory comments or personal attacks, trolling, public or private harassment, insults, or other unprofessional conduct.
Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct. Project maintainers who do not follow the Code of Conduct may be removed from the project team.
Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by opening an issue or contacting [Eric Hellman](mailto:eric@ebookfoundation.org).
This Code of Conduct is adapted from the [Contributor Covenant](http:contributor-covenant.org), version 1.0.0, available at [http://contributor-covenant.org/version/1/0/0/](http://contributor-covenant.org/version/1/0/0/)

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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
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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
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To "modify" a work means to copy from or adapt all or part of the work
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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
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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
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of having them make modifications exclusively for you, or provide you
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for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
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Conveying under any other circumstances is permitted solely under
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No covered work shall be deemed part of an effective technological
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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
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modification of the work as a means of enforcing, against the work's
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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
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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.
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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
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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
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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,
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typical or common use of that class of product, regardless of the status
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actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
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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
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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
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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
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# LibraryAuth
LibraryAuth is a Django app that bundles together user registration and authentications with commonly used library authentication methods. It bundles Django Registration, Django Email Change and Python Social Auth.
The example application shows how to set up a site with password and social authentication. An example showing the Library authentication is work-in-progress
LibraryAuth is used by Unglue.it
LibraryAuth is copyright Gluejar, Inc. (2014-2016) and is licensed under the Gnu General Public License.

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The MIT License (MIT)
Copyright (c) 2013 Gabriele Alese <gabriele@alese.it>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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pyepub
======
An enhanced python library for dealing with EPUB2 files.
Based on latest [py-clave](http://github.com/gabalese/py-clave) development release.
Installation
------------
Grab the [latest stable release](https://github.com/gabalese/pyepub/archive/master.zip). Unpack the tarball and execute:
```
$ cd pyepub
$ python setup.py install
```
This will install the EPUB library in your current python environment as `pyepub`.
Basic usage
-----------
The code is as documented as I could. First `import` the EPUB class to use:
```python
from pyepub import EPUB
```
And you're pretty much done. Since pyepub.EPUB inherits largely from zipfile.Zipfile, the inferface is quite familiar.
For example, you can create a new EPUB to write into using the "w" flag:
```python
from pyepub import EPUB
epub = EPUB("newfile.epub", "w")
```
By default the epub is `open`-ed in read-only mode and exposes json-able dictionary of OPF properties.
```python
>>> from pyepub import EPUB
>>> epub = EPUB("file.epub")
>>> epub.info
{"metadata":[...], "manifest": [...], "spine": [...], "guide": [...]}
```
The EPUB can be opened in append ("a") mode, thus enabling adding content.
Due to the internal nature of zipfile stdlib module, a zipfile can't overwrite its contents.
Thusly, a EPUB opened for append is never overwritten. The `EPUB.__init__` constructor closes the local file and swaps
the reference with a `StringIO` file-like object. To write the final file to disk, you can call the `EPUB.writetodisk()`
method:
```python
>>> from pyepub import EPUB
>>> epub = EPUB("file.epub","a")
>>> epub.close() # not necessary, since .writetodisk() will close the file for you.
>>> epub.writetodisk("newfile.epub")
>>> epub.filename # the "file" remains available at .filename property, and can be .read() as usual.
<StringIO.StringIO instance at 0x1004a8c20>
```
License
-------
pyepub is distributed according to the MIT license. I don't like GPL-esque licenses, and I reinvented the wheel (since
there already is a EPUB library in pypi) to avoid involving GPL in my projects.

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Copyright (c) Robert Thomson and individual contributors.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of Robert Thomson, Seantis, nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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FEF Questionnaire
=====================
Introduction
------------
FEF Questionnaire is a Django questionnaire app which is easily customizable
and includes advanced dependency support using boolean expressions.
It allows an administrator to create and edit questionnaires in the Django
admin interface, with support for multiple languages.
It can be run either as a survey where subjects are solicited by email, or as a web-based poll.
In either mode, an instance can be linked to an arbitrary object via the django content-types module.
Try out the questionaire on the Unglue.it page for "Open Access Ebooks" https://unglue.it/work/82028/
History
-------
The questionnaire app was originally developed by [Seantis](https://github.com/seantis), itself derived from [rmt](https://github.com/rmt). Eldest Daughter picked up the project and named it [ED-questionnaire](git://github.com/eldest-daughter/ed-questionnaire) because they had been using it and the Seantis version had entered a steady state of development. There are several feature changes they wanted and decided to head up the maintenance themselves.
The old versions are tagged as follows:
* tag 1.0 - state of last commit by the original developer (rmt)
* tag 1.1 - contains merged changes by other forks improving the original
* tag 2.0 - original updated trunk from Seantis version
* tag 2.5 - contains the original Seantis version and all PRs merged in as of 12/09/15. It's considered to be the backwards compatible version of the repository.
The "ED-questionnaire" version was dubbed v3.0. It is not compatible with the v2.x branches.
The "FEF-questionnaire" was created to add the ability to link the questionnaire to individual books in a book database. We'll call this v4.0
About this Manual
-----------------
FEF Questionnaire is not a very well documented app so far to say the least. This manual should give you a general idea of the layout and concepts of it, but it is not as comprehensive as it should be.
What it does cover is the following:
* **Integration** lays out the steps needed to create a new Django app together with the questionnaire. The same steps can be used to integrate the questionnaire into an existing site (though you would be entering unpaved ways).
* **Concepts** talks about the data model and the design of the application.
* **Migration** explains how a questionnaire defined with 1.0 can be used in 2.0.
* **2.0 Postmortem** talks about some experiences made during the development of 2.0.
Integration
-----------
This part of the docs will take you through the steps needed to create a questionnaire app from scratch. It should also be quite handy for the task of integrating the questionnaire into an existing site.
First, create a folder for your new site:
mkdir site
cd site
Create a virtual environment so your python packages don't influence your system
virtualenv --no-site-packages -p python2.5 .
Activate your virtual environment
source bin/activate
Install Django
pip install django
Create your Django site
django-admin.py startproject mysite
Create a place for the questionnare
cd mysite
mkdir apps
cd apps
Clone the questionnaire source
git clone git://github.com/EbookFoundation/fef-questionnaire.git
You should now have a ed-questionnaire folder in your apps folder
cd fef-questionnaire
The next step is to install the questionnaire.
python setup.py install
If you are working with ed-questionnaire from your own fork you may want to use `python setup.py develop` instead, which will save you from running `python setup.py install` every time the questionnaire changes.
Now let's configure your basic questionnaire.
First, you want to setup the languages used in your questionnaire. Open up your `mysite` folder in your favorite text editor.
Open `mysite/mysite/settings.py` and add following lines, representing your languages of choice:
LANGUAGES = (
('en', 'English'),
('de', 'Deutsch')
)
At the top of `settings.py` you should at this point add:
import os.path
We will use that below for the setup of the folders.
In the same file add the questionnaire static directory to your STATICFILES_DIRS:
STATICFILES_DIRS = (
os.path.abspath('./apps/fef-questionnaire/questionnaire/static/'),
)
Also add the locale and request cache middleware to MIDDLEWARE_CLASSES:
'django.middleware.locale.LocaleMiddleware',
'questionnaire.request_cache.RequestCacheMiddleware',
If you are using Django 1.7 you will need to comment out the following line, like so:
# 'django.middleware.security.SecurityMiddleware',
otherwise you will get an error when trying to start the server.
Add the questionnaire template directory as well as your own to TEMPLATE_DIRS:
os.path.abspath('./apps/fef-questionnaire/questionnaire/templates'),
os.path.abspath('./templates'),
And finally, add `transmeta`, `questionnaire` to your INSTALLED_APPS:
'django.contrib.sites',
'transmeta',
'questionnaire',
'questionnaire.page',
To get the "sites" framework working you also need to add the following setting:
SITE_ID = 1
Next up we want to edit the `urls.py` file of your project to link the questionnaire views to your site's url configuration.
For an empty site with enabled admin interface you add:
from django.conf.urls import patterns, include, url
from django.contrib import admin
admin.autodiscover()
urlpatterns = patterns('',
url(r'^admin/', include(admin.site.urls)),
# questionnaire urls
url(r'q/', include('questionnaire.urls')),
)
Having done that we can initialize our database. (For this to work you must have setup your DATABASES in `settings.py`.). First, in your CLI navigate back to the `mysite` folder:
cd ../..
The check that you are in the proper folder, type `ls`: if you can see `manage.py` in your list of files, you are good. Otherwise, find your way to the folder that contains that file. Then type:
python manage.py syncdb
python manage.py migrate
The questionnaire expects a `base.html` template to be there, with certain stylesheets and blocks inside. Have a look at `./apps/fef-questionnaire/example/templates/base.html`.
For now you might want to just copy the `base.html` to your own template folder.
mkdir templates
cd templates
cp ../apps/fef-questionnaire/example/templates/base.html .
Congratulations, you have setup the basics of the questionnaire! At this point this site doesn't really do anything, as there are no questionnaires defined.
To see an example questionnaire you can do the following (Note: this will only work if you have both English and German defined as Languages in `settings.py`):
python manage.py loaddata ./apps/fef-questionnaire/example/fixtures/initial_data.yaml
You may then start your development server:
python manage.py runserver
And navigate to [localhost:8000](http://localhost:8000/).
Concepts
--------
The ED Questionnaire has the following tables, described in detail below.
* Subject
* RunInfo
* RunInfoHistory
* Question
* Choice
* QuestionSet
* Questionnaire
* Answer
* Landing
### Subject
A subject is someone filling out a questionnaire.
Subjects are primarily useful in a study where the participants answer a questionnaire repeatedly. In this case a subject may be entered. Whoever is conducting the study (i.e. the person running the questionnaire app), may then periodically send emails inviting the subjects to fill out the questionnaire.
Sending Emails is covered in detail later.
Of course, not every questionnaire is part of a study. Sometimes you just want to find out what people regard as more awesome: pirates or ninjas*?
*(it's pirates!)
Though a poll would be a better choice for this example, one can find the answer to that question with ED Questionnaire by using an anonymous subject. The next chapter *Questionnaire* will talk about that in more detail.
### RunInfo
A runinfo refers to the currently active run of a subject.
A subject who is presently taking a questionnaire is considered to be on a run. The runinfo refers to that run and carries information about it.
The most important information associated with a runinfo is the subject, a random value that is used to generate the unique url to the questionnaire, the result of already answered questions and the progress.
Once a run is over it is deleted with some information being carried over to the RunInfoHistory.
Runs can be tagged by any number of comma separated tags. If tags are used, questions can be made to only show up if the given tag is part of the RunInfo.
### RunInfoHistory
The runinfo history is used to refer to a set of answers.
### Question
A question is anything you want to ask a subject. There are a number of different types you can use:
* **choice-yesno** - Yes or No
* **choice-yesnocomment** - Yes or No with a chance to comment on the answer
* **choice-yesnodontknow** - Yes or No or Whaaa?
* **open** - A simple one line input box
* **open-textfield** - A box for lengthy answers
* **choice** - A list of choices to choose from
* **choice-freeform** - A list of choices with a chance to enter something else
* **choice-multiple** - A list of choices with multiple answers
* **choice-multiple-freeform** - Multiple Answers with multiple user defined answers
* **range** - A range of number from which one number can be chosen
* **number** - A number
* **timeperiod** - A timeperiod
* **custom** - Custom question using a custom template
* **comment** - Not a question, but only a comment displayed to the user
* **sameas** - Same type as another question
*Some of these types, depend on checks or choices. The number question for instance can be controlled by setting the checks to something like `range=1-100 step=1`. The range question may also use the before-mentioned checks and also `unit=%`. Other questions like the choice-multiple-freeform need a `extracount=10` if ten extra options should be given to the user.
I would love to go into all the details here but time I have not so I my only choice is to kindly refer you to the qprocessor submodule which handles all the question types.*
Next up is the question number. The question number defines the order of questions alphanumerically as long as a number of questions are shown on the same page. The number is also used to refer to the question.
The text of the question is what the user will be asked. There can be one text for each language defined in the `settings.py` file.
The extra is an additional piece of information shown to the user. As of yet not all questions support this, but most do.
An important aspect of questions (and their parents, QuestionSets) is the checks field. The checks field does a lot of things (possibly too many), the most important of which is to define if a certain question or questionset should be shown to the current subject.
The most important checks on the question are the following:
* **required** A required question must be answered by the user
* **requiredif="number,answer"** Means that the question is required if the question with *number* is equal to *answer*.
* **shownif** Same as requiredif, but defining if the question is shown at all.
* **maleonly** Only shown to male subjects
* **femaleonly** Only shown to female subjects
* **iftag="tag"** Question is only shown if the given tag is in the RunInfo
Checks allow for simple boolean expressions like this:
`iftag="foo or bar"` or `requiredif="1,yes and 2,no"`
### Choice
A choice is a possible value for a multiple choice question.
### QuestionSet
A number of questions together form a questionset. A questionset is ultimately single page of questions. Questions in the same questionset are shown on the same page.
QuestionSets also have checks, with the same options as Questions. There's only one difference, **required** and **requiredif** don't do anything.
A questionset which contains no visible questions (as defined by **shownif**) is skipped.
### Answer
Contains the answer to a question. The value of the answer is stored as JSON.
### Questionnaire
A questionnaire is a group of questionsets together.
### Landing
In Poll mode, the landing url links a Questionnaire to an Object and a User to a Subject.
Migration of 1.x to 2.0
-----------------------
2.0 added new fields to the questionnaire, but it did so in a backwards compatible way. None of the new fields are mandatory and no changes should be necessary to your existing questionnaire. Since we do not have any relevant testing data however, you might find yourself on your own if it doesn't work. Please file an issue if you think we did something wrong, so we can fix it and help you.
As Django per default does not provide a way to migrate database schemas, we pretty much make use of the bulldozer way of migrating, by exporting the data from one database and import it into a newly created one.
From you existing 1.x site do:
python manage.py dumpdata >> export.yaml
Copy your file to your new site and in your new site, create your empty database:
python manage.py syncdb
You may then import your data from your old site, which should probably work :)
python manage.py loaddata export.yaml
This of course covers only the data migration. How to migrate your custom tailored site to use questionnaire 2.0 is unfortunately something we cannot really document.
2.0 Postmortem
--------------
2.0 was the result of the work we put into Seantis questionnaire for our second project with it. We did this project without the help of the questionnaire's creator and were pretty much on our own during that time.
Here's what we think we learned:
### ED.questionnaire is a Framework
More than anything else ed.questionnaire should be thought of as a framework. Your site has to provide and do certain things for the questionnaire to work. If your site is a customized questionnaire for a company with other needs on the same site you will end up integrating code which will call questionnaire to setup runs and you will probably work through the answer records to provide some sort of summary.
If it was a library you could just work with a nice API, which does not exist.
### Don't Go Crazy with Your Checks
We used a fair amount of checks in both questionset and questions to control a complex questionnaire. We offloaded the complexity of the questionnaire into an Excel file defined by the customer and generated checks to copy that complexity into our application.
Though this approach certainly works fine it does not give you a good performance. The problem is, if you have hundreds of questions controlled by runinfo tags, that you end up with most CPU cycles spent on calculating the progress bar on each request. It is precisely for that reason that we implemented the QUESTIONNAIRE_PROGRESS setting (you can learn more about that by looking at the example settings.py).
We managed to keep our rendering time low by doing the progress bar using AJAX after a page was rendered. It is only a workaround though. Calculating the progress of a run in a huge questionnaire remains a heavy operation, so for really huge questionnaires one might consider removing the progress bar altogether. There is still some optimization to be made, but it essentially will remain the slowest part of the questionnaire, because at the end of the day interpreting loads of checks is not something you can do in a fast way, unless your name is PyPy and your programmers are insanely talented.
### There are not Enough Tests
There are a few that do some simple testing, but more are needed. More tests would also mean that more refactoring could be done which would be nice, because there certainly is a need for some refactoring.
### The Admin Interface is not Good Enough
Django admin is a nice feature to have, but we either don't leverage it well enough, or it is not the right tool for the questionnaire. In any case, if you are expecting your customer to work with the questionnaire's structure you might have to write your own admin interface. The current one is not good enough.
4.0 Changes
--------------
Version 4.0 has not been tested for compatibility with previous versions.
* Broken back links have been fixed. The application works in session mode and non-session mode.
* We've updated to Bootstrap 3.3.6 and implemented label tags for accessibility
* "landings" have been added so that survey responses can be linked to arbitrary models in an application. template tags have been added that allow questions and answers to refer to those models.
* question types have been added so that choices can be offered without making the question required.
* styling of required questions has been spiffed up