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