XPost: comp.dsp, sci.crypt, sci.electronics.design   
   From: OneBigLever@InfiniteSeries.Org   
      
   On Thu, 17 Dec 2009 20:05:07 -0600, krw  wrote:   
      
   >On Thu, 17 Dec 2009 17:44:12 -0800 (PST), Mark    
   >wrote:   
   >   
   >>   
   >>>   
   >>> Passing encrypted video over a satellite network built for unencrypted   
   >>> analog video is not a trivial challenge. As far as I know, there   
   >>> exists no scheme to do this that has not been broken already. The   
   >>> problem is that encryption works partly by diffusing information so   
   >>> that no part of the output looks like any part of the input. The   
   >>> satellite link is filled with errors and distortion that have to be   
   >>> contained to retain adequate video quality.   
   >>>   
   >>> DS   
   >>   
   >>um,, is that why General Instrument was able to do it did it 15 years   
   >>ago for HBO?   
   >   
   >It can obviously be done.  It just requires different, perhaps less   
   >efficient, error correction algorithms which may mean lower S/N   
   >required.   
      
     Wrong.  It just requires MORE FEC.   
      
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