This file is indexed.

/usr/share/doc/open-invaders-data/AUTHORS is in open-invaders-data 0.3-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Darryl LeCount: Lead programmer, design, sound, graphics
Amber Adams: Graphics, testing and feedback
TheLinuxGuy: Testing and feedback
Orz: Collision detection code (the PMASK library)
Cody "Codeman38" Boisclair: The font "Press Start" (the basis for the ingame font)
Jakob Fischer: The font "Abduction 2002" (used for the game logo)

Music:
In game - Timeless Beauty by Robert Schneider (aka Meta)
Title - Boiled Blood by Robert Schneider (aka Meta)
Hiscore - Trancing by Robert Schneider (aka Meta)
Ending - Birthro by Robert Schneider (aka Meta)

Thanks also to:

The crew on #c++ at irc.quakenet.org (especially BD-Calvin and Sprudling), 
The guys at happypenguin.org and allegro.cc
Shawn Hargreaves for Allegro

for all the assistance!