96 lines
4.8 KiB
Plaintext
96 lines
4.8 KiB
Plaintext
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NETHACK GENERAL PUBLIC LICENSE
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(Copyright 1989 M. Stephenson)
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(Based on the BISON general public license,
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copyright 1988 Richard M. 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 to
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make the 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 we
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want you to have, we need to make restrictions that forbid anyone to deny you
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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
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copies of NetHack, that you receive source code or else can get it if you
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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 copies
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of NetHack, you must give the recipients all the rights that you have. You
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must make sure that they, too, receive or can get the source code. And you
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must tell them 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
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else and passed on, we want its recipients to know that what they have is
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not what 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 or
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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
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you receive it, in any medium, provided that you keep intact the notices on
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all files that refer to copyrights, to this License Agreement, and to the
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absence of any warranty; and give any other recipients of the NetHack
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program a copy 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 the
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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 protection
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in exchange for 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
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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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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
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terminated. However, parties who have received computer software programs
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from you with this License Agreement will not have their licenses terminated
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so long as 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
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other words, go ahead and share NetHack, but don't try to stop anyone else
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from sharing it farther.
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