A list of licenses and copyright notices:

soud/hit.ogg : Copyright (C) 2009 Thiago Leucz Astrizi, released under
               Free Art License 1.3 (http://artlibre.org/licence/lal/en).

images/ball.png: Copyright (C) 2009 Thiago Leucz Astrizi, released under
                 Free Art License 1.3 (http://artlibre.org/licence/lal/en).
