.. -*- mode: rst; coding: utf-8 -*-

============================================
Star Traders: A Game of Interstellar Trading
============================================

**Copyright © 1990–2020, John Zaitseff.**

The Star Traders game is free software that is distributed under the
terms of the GNU General Public License.  The actual copyright on this
program (“the Program”, in the language of the License) belongs to John
Zaitseff, although the text of the License itself belongs to the Free
Software Foundation.

Even though the GNU General Public License does *not* require you to send
your modifications back to the author, it is considered “good form” to do
so, as this allows your modifications to be incorporated into future
versions of the program, allowing others to benefit from them.


==========================
GNU GENERAL PUBLIC LICENSE
==========================
--------------------------
 Version 3,  29 June 2007
--------------------------

| Copyright © 2007 Free Software Foundation, Inc.
| https://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
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To protect your rights, we need to prevent others from denying you these
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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
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Developers that use the GNU GPL protect your rights with two steps:
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For the developers’ and authors’ protection, the GPL clearly explains
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Some devices are designed to deny users access to install or run modified
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The precise terms and conditions for copying, distribution and
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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
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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
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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
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to implement a Standard Interface for which an implementation is
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this context, means a major essential component (kernel, window system,
and so on) of the specific operating system (if any) on which the
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The “Corresponding Source” for a work in object code form means all the
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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
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You may make, run and propagate covered works that you do not convey,
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You may convey covered works to others for the sole purpose of having
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Conveying under any other circumstances is permitted solely under the
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3. Protecting Users’ Legal Rights From Anti-Circumvention Law.
--------------------------------------------------------------

No covered work shall be deemed part of an effective technological
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When you convey a covered work, you waive any legal power to forbid
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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 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
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c) You must license the entire work, as a whole, under this License to
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   to the whole of the work, and all its parts, regardless of how they
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d) If the work has interactive user interfaces, each must display
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   need not make them do so.

A compilation of a covered work with other separate and independent
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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
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   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
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   received the object code with such an offer, in accord with subsection
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d) Convey the object code by offering access from a designated place
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e) Convey the object code using peer-to-peer transmission, provided you
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   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
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“Installation Information” for a User Product means any methods,
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If you convey an object code work under this section in, or with, or
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code on the User Product (for example, the work has been installed in
ROM).

The requirement to provide Installation Information does not include a
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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
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d) Limiting the use for publicity purposes of names of licensors or
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e) Declining to grant rights under trademark law for use of some trade
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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
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   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**


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.

.. parsed-literal::

     *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 <https://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:

.. parsed-literal::

     *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 https://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
https://www.gnu.org/licenses/why-not-lgpl.html.
