No, it is a small file that you install as a system update to your authorized 
player.  It is serial number specific.  Once installed, it doesn't have to be 
installed again, even if you do future software upgrades.  I suppose, if you 
had a real destructive crash, then it might get wiped out, but otherwise not. 
The file you run will be keyed to your units s/n.

Steve, K8SP
----- Original Message ----- 
From: "Martin McCormick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, July 15, 2009 12:01 PM
Subject: Re: digital talking book players


Walt Sebastian writes:
> Hi Guys,
> Ok, What is a NLS key?

I have an answer and a question. The NLS key is a
digital signature that authorizes you to listen to the Talking
Books. My question is, how is that handled?

Is it a SIM card you put in to your player that contains
the digital key to decrypt the files or is it a long string of
digits you manually have to do something with before your player
will work?

Martin McCormick