Took a quick look at the files and istm that the voiceover files are encrypted with a key pair that are provided by the server when it instructs the client to play that particular mp3 clip / set.
From my quick look I think the controlling script or data files are encrypted and probably provide stop/start indexing and so on, and the mp3s are encrypted also.
This same technique is used for maps and suchlike, to stop folks ripping out all the goodies and knowing all the expansion plot etc before actually playing to that point.
If someone cared enough, a list of key pairs could possibly be collected and stored+used against the voice overs (and the maps). No-one has bothered to undertake this yet, and I would guess it won't happen any time soon.
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