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93 lines
4.6 KiB
Plaintext
93 lines
4.6 KiB
Plaintext
NETHACK GENERAL PUBLIC LICENSE
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(Copyright 1989 M. Stephenson)
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(Based on the BISON general public license, copyright 1988 Richard M. Stallman)
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Everyone is permitted to copy and distribute verbatim copies of this license,
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but changing it is not allowed. You can also use this wording to make the
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terms for other programs.
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The license agreements of most software companies keep you at the mercy of
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those companies. By contrast, our general public license is intended to give
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everyone the right to share NetHack. To make sure that you get the rights
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we want you to have, we need to make restrictions that forbid anyone to deny
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you these rights or to ask you to surrender the rights. Hence this license
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agreement.
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Specifically, we want to make sure that you have the right to give away copies
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of NetHack, that you receive source code or else can get it if you want it,
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that you can change NetHack or use pieces of it in new free programs, and
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that you know you can do these things.
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To make sure that everyone has such rights, we have to forbid you to deprive
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anyone else of these rights. For example, if you distribute copies of NetHack,
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you must give the recipients all the rights that you have. You must make sure
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that they, too, receive or can get the source code. And you must tell them
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their rights.
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Also, for our own protection, we must make certain that everyone finds out
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that there is no warranty for NetHack. If NetHack is modified by someone else
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and passed on, we want its recipients to know that what they have is not what
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we distributed.
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Therefore we (Mike Stephenson and other holders of NetHack copyrights) make
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the following terms which say what you must do to be allowed to distribute
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or change NetHack.
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COPYING POLICIES
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1. You may copy and distribute verbatim copies of NetHack source code as you
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receive it, in any medium, provided that you keep intact the notices on all
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files that refer to copyrights, to this License Agreement, and to the absence
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of any warranty; and give any other recipients of the NetHack program a copy
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of this License Agreement along with the program.
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2. You may modify your copy or copies of NetHack or any portion of it, and
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copy and distribute such modifications under the terms of Paragraph 1 above
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(including distributing this License Agreement), provided that you also do
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the following:
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a) cause the modified files to carry prominent notices stating that you changed
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the files and the date of any change; and
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b) cause the whole of any work that you distribute or publish, that in whole
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or in part contains or is a derivative of NetHack or any part thereof, to
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be licensed at no charge to all third parties on terms identical to those
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contained in this License Agreement (except that you may choose to grant more
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extensive warranty protection to some or all third parties, at your option)
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c) You may charge a distribution fee for the physical act of transferring
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a copy, and you may at your option offer warranty protection in exchange for
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a fee.
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3. You may copy and distribute NetHack (or a portion or derivative of it,
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under Paragraph 2) in object code or executable form under the terms of Paragraphs
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1 and 2 above provided that you also do one of the following:
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a) accompany it with the complete machine-readable source code, which must
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be distributed under the terms of Paragraphs 1 and 2 above; or,
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b) accompany it with full information as to how to obtain the complete machine-readable
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source code from an appropriate archive site. (This alternative is allowed
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only for noncommercial distribution.)
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For these purposes, complete source code means either the full source distribution
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as originally released over Usenet or updated copies of the files in this
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distribution used to create the object code or executable.
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4. You may not copy, sublicense, distribute or transfer NetHack except as
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expressly provided under this License Agreement. Any attempt otherwise to
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copy, sublicense, distribute or transfer NetHack is void and your rights to
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use the program under this License agreement shall be automatically terminated.
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However, parties who have received computer software programs from you with
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this License Agreement will not have their licenses terminated so long as
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such parties remain in full compliance.
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Stated plainly: You are permitted to modify NetHack, or otherwise use parts
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of NetHack, provided that you comply with the conditions specified above;
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in particular, your modified NetHack or program containing parts of NetHack
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must remain freely available as provided in this License Agreement. In other
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words, go ahead and share NetHack, but don't try to stop anyone else from
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sharing it farther.
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