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1 NETHACK GENERAL PUBLIC LICENSE
2 (Copyright 1989 M. Stephenson)
3 (Based on the BISON general public license, copyright 1988 Richard M.
4 Stallman)
5 Everyone is permitted to copy and distribute verbatim copies of this
6 license, but changing it is not allowed. You can also use this wording
7 to make the terms for other programs.
8 The license agreements of most software companies keep you at the mercy
9 of those companies. By contrast, our general public license is intended
10 to give everyone the right to share NetHack. To make sure that you get
11 the rights we want you to have, we need to make restrictions that forbid
12 anyone to deny you these rights or to ask you to surrender the rights.
13 Hence this license agreement.
14
15 Specifically, we want to make sure that you have the right to give away
16 copies of NetHack, that you receive source code or else can get it if
17 you want it, that you can change NetHack or use pieces of it in new free
18 programs, and that you know you can do these things.
19
20 To make sure that everyone has such rights, we have to forbid you to
21 deprive anyone else of these rights. For example, if you distribute
22 copies of NetHack, you must give the recipients all the rights that you
23 have. You must make sure that they, too, receive or can get the source
24 code. And you must tell them their rights.
25
26 Also, for our own protection, we must make certain that everyone finds
27 out that there is no warranty for NetHack. If NetHack is modified by
28 someone else and passed on, we want its recipients to know that what
29 they have is not what we distributed.
30
31 Therefore we (Mike Stephenson and other holders of NetHack copyrights)
32 make the following terms which say what you must do to be allowed to
33 distribute or change NetHack.
34
35 COPYING POLICIES
36 You may copy and distribute verbatim copies of NetHack source code as
37 you receive it, in any medium, provided that you keep intact the notices
38 on all files that refer to copyrights, to this License Agreement, and to
39 the absence of any warranty; and give any other recipients of the
40 NetHack program a copy of this License Agreement along with the program.
41 You may modify your copy or copies of NetHack or any portion of it, and
42 copy and distribute such modifications under the terms of Paragraph 1
43 above (including distributing this License Agreement), provided that you
44 also do the following:
45 a) cause the modified files to carry prominent notices stating that you
46 changed the files and the date of any change; and
47
48 b) cause the whole of any work that you distribute or publish, that in
49 whole or in part contains or is a derivative of NetHack or any part
50 thereof, to be licensed at no charge to all third parties on terms
51 identical to those contained in this License Agreement (except that you
52 may choose to grant more extensive warranty protection to some or all
53 third parties, at your option)
54
55 c) You may charge a distribution fee for the physical act of
56 transferring a copy, and you may at your option offer warranty
57 protection in exchange for a fee.
58
59 You may copy and distribute NetHack (or a portion or derivative of it,
60 under Paragraph 2) in object code or executable form under the terms of
61 Paragraphs 1 and 2 above provided that you also do one of the following:
62 a) accompany it with the complete machine-readable source code, which
63 must be distributed under the terms of Paragraphs 1 and 2 above; or,
64
65 b) accompany it with full information as to how to obtain the complete
66 machine-readable source code from an appropriate archive site. (This
67 alternative is allowed only for noncommercial distribution.)
68
69 For these purposes, complete source code means either the full source
70 distribution as originally released over Usenet or updated copies of the
71 files in this distribution used to create the object code or executable.
72
73
74 You may not copy, sublicense, distribute or transfer NetHack except as
75 expressly provided under this License Agreement. Any attempt otherwise
76 to copy, sublicense, distribute or transfer NetHack is void and your
77 rights to use the program under this License agreement shall be
78 automatically terminated. However, parties who have received computer
79 software programs from you with this License Agreement will not have
80 their licenses terminated so long as such parties remain in full
81 compliance.
82 Stated plainly: You are permitted to modify NetHack, or otherwise use
83 parts of NetHack, provided that you comply with the conditions specified
84 above; in particular, your modified NetHack or program containing parts
85 of NetHack must remain freely available as provided in this License
86 Agreement. In other words, go ahead and share NetHack, but don't try to
87 stop anyone else from sharing it farther.

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