Files: error/critical error.ogg
Source: http://www.freesound.org/people/liquidhot/sounds/23514/
Copyright: 2009, liquidhot
License: CC-BY-3.0

Files: login/login accepted.ogg
Source: http://www.freesound.org/people/liquidhot/sounds/23516/
Copyright: 2006, liquidhot
License: CC-BY-3.0

Files: logout/terminating.ogg
Source: http://www.freesound.org/people/liquidhot/sounds/23513/
Copyright: 2006, liquidhot
License: CC-BY-3.0

Files: purchase/code accepted.ogg
Source: http://www.freesound.org/people/epanody/sounds/97827/
Copyright: 2010, epanody
License: CC-BY-3.0