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