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licence.txt
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licence.txt
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Crawl General Public Licence
Linley Henzell
(Copyright 1997-1999 Linley Henzell)
Yes, this is an almost exact copy of the Nethack Licence, but has
obviously been adapted for Crawl (under the 'terms for other
programs' portion of paragraph one). Crawl contains no code from
Nethack in any shape or form.
Based on the NETHACK GENERAL PUBLIC LICENCE
(Copyright 1989 M. Stephenson)
Based on the BISON GENERAL PUBLIC LICENCE
(Copyright 1988 Richard M. Stallman)
Everyone is permitted to copy and distribute verbatim copies of
this licence, but changing it is not allowed. You can also use this
wording to make the terms for other programs.
The licence agreements of most software companies keep you at the
mercy of those companies. By contrast, our general public licence
is intended to give everyone the right to share Crawl. 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 licence agreement.
Specifically, we want to make sure that you have the right to give
away copies of Crawl, that you receive source code or else can get
it if you want it, that you can change Crawl 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 Crawl, 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 Crawl. If Crawl is modified
by someone else and passed on, we want its recipients to know that
what they have is not what we distributed.
Therefore I (Linley Henzell, the copyright holder of Crawl) make
the following terms which say what you must do to be allowed to
distribute or change Crawl.
COPYING POLICIES
1. You may copy and distribute verbatim copies of Crawl 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 Licence
Agreement, and to the absence of any warranty; and give any other
recipients of the Crawl program a copy of this Licence Agreement
along with the program.
2. You may modify your copy or copies of Crawl or any portion of it,
and copy and distribute such modifications under the terms of
Paragraph 1 above (including distributing this Licence 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 Crawl
or any part thereof, to be licensed at no charge to all third
parties on terms identical to those contained in this Licence
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.
3. You may copy and distribute Crawl (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 available from my web site or updated
copies of the files in this distribution used to create the object
code or executable.
4. You may not copy, sublicence, distribute or transfer Crawl except
as expressly provided under this Licence Agreement. Any attempt
otherwise to copy, sublicence, distribute or transfer Crawl is
void and your rights to use the program under this Licence
agreement shall be automatically terminated. However, parties who
have received computer software programs from you with this
Licence Agreement will not have their licences terminated so long
as such parties remain in full compliance.
Stated plainly: You are prohibited by the terms of this Licence
Agreement from using Crawl for gainful purposes. You are permitted
to modify Crawl, or otherwise use parts of Crawl, provided that you
comply with the conditions specified above; in particular, your
modified Crawl or program containing parts of Crawl must remain
freely available as provided in this Licence Agreement. In other
words, go ahead and share Crawl, but don't try to stop anyone else
from sharing it farther.