This is a Debian prepackaged version of the xgalaga video game.

The source to this package can be found on the xgalaga home page, 
http://rumsey.org/xgal.html, or at ftp://ftp.netcom.com/pub/og/ogre/games/

Xgalaga is Copyright (c) 1995 Joe Rumsey <mrogre@mediaone.net>

Xgalaga is licensed under the GNU Public License GPL. On Debian systems the
complete text of the GPL is in /usr/share/common-licenses/GPL
 
Xgalaga contains the libsprite library, with the following copyright:
  
/*
        Copyright 1989          Kevin P. Smith
                                Scott Silvey

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
notice appear in all copies.
*/