Summary: Most of this game is in the public domain, and the parts that
aren't are under relatively permissive copyright notices.

In detail....

As noted in the [Credits] screen, credit for the first 80 built-in
scenes goes to one or more of:

	Christer Ericson
	Carl Baltrunas
	Christopher Kempke
	Alan Teague
	Andrew Kepert
	Mike Ames
	Terry Monks
	Peter & Cai Lewis

I do not know what copyright rights they may have in them; the game I
saw for the Macintosh claims copyright for Christer Ericson, but does
not say whether that applies to all portions of the game or just to the
game as a whole.  The internal documentation of that version permits
free distribution of it, for what that may be worth.

The Macintosh version claims to have been written by Christer Ericson,
and provided a contact address (christer@cs.umu.se).  I wrote to that
address, asking permission to write an X version; the reply granted
permission, and gave permission to use the built-in scenes from the Mac
version provided I credited the scene designers.

font.pbm and the blockade-info-*.c files derived therefrom contain some
of the characters from the font
-adobe-courier-medium-r-normal--14-140-75-75-m-90-iso8859-1
from the MIT distribution of X11R4, where it is labeled with the
following copyright:

	Copyright 1984, 1987 Adobe Systems, Inc.
	Portions Copyright 1988 Digital Equipment Corporation

	Adobe is a registered trademark of Adobe Systems, Inc.  Permission 
	to use these trademarks is hereby granted only in association with the
	images described in this file.

	Permission to use, copy, modify, and distribute this software and
	its documentation for any purpose and without fee is hereby granted,
	provided that the above copyright notices appear in all copies and
	that both those copyright notices and this permission notice appear
	in supporting documentation, and that the names of Adobe Systems and
	Digital Equipment Corporation not be used in advertising or
	publicity pertaining to distribution of the software without
	specific, written prior permission.  Adobe Systems and Digital
	Equipment Corporation make no representations about the suitability
	of this software for any purpose.  It is provided "as is" without
	express or implied warranty.

	ADOBE SYSTEMS AND DIGITAL EQUIPMENT CORPORATION DISCLAIM ALL
	WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL ADOBE
	SYSTEMS AND DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY SPECIAL,
	INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
	RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
	CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
	CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

The particular arrangements of those characters in the bitmaps, on the
other hand, are my work and is in the public domain (except for
font.pbm, in which case the arrangement is required by pbmtext).

The bitmaps found in blockade-pix.c are my work, but they were designed
to mimic reasonably closely the overall look of the analogous bitmaps
used in the Macintosh game.  Exactly who owns the rights to those is
unclear to me and probably depends on jurisdiction - but see the last
paragraph of this file.

I do not know whose the basic game idea is; I assume it's Christer
Ericson's, since I have seen it nowhere but in the Macintosh game I
derived this from (and, of course, in my version).

All of the C code, except the code serving no purpose but to
incorporate the aforementioned bitmaps or the first 80 built-in scenes
into the program, is original with me.

Those parts of this work which it is my right to do so I hereby place
into the public domain.

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