Replay	AuthCtl
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Valid is an md5hash of the unit serial number, the unit ISC, the unit OEM, and the entire SysConfig/Auth tree in parenthesised form. ValidSig2? is then a ElGamal? signature of Valid.

For instance, on a 4000 (where the ISC and OEM are both 0), the md5hash is taken of a body of text similar to:

RTV4080K1AA5000149                                                              
0                                                                               
0                                                                               
(                                                                               
  'Activated' N '1'                                                             
  'Registered' N '0'                                                            
  'RegisteredMyReplayTV' N '1'                                                  
  ChannelGuide (                                                                
   OK (                                                                         
    'Eff' N '0'                                                                 
    'Exp' N '0'                                                                 
    'Auth' N '1'                                                                
   )                                                                            
  )                                                                             
  ReplayGuide (                                                                 
   OK (                                                                         
    'Eff' N '0'                                                                 
    'Exp' N '0'                                                                 
    'Auth' N '1'                                                                
   )                                                                            
  )                                                                             
  Zones (                                                                       
   OK (                                                                         
    'Eff' N '0'                                                                 
    'Exp' N '0'                                                                 
    'Auth' N '1'                                                                
   )                                                                            
  )                                                                             
  View (                                                                        
   OK (                                                                         
    'Eff' N '0'                                                                 
    'Exp' N '0'                                                                 
    'Auth' N '1'                                                                
   )                                                                            
  )                                                                             
  Record (                                                                      
   OK (                                                                         
    'Eff' N '0'                                                                 
    'Exp' N '0'                                                                 
    'Auth' N '1'                                                                
   )                                                                            
  )                                                                             
)                                                                               

The text that's actually used has no whitespace, either horizontal or vertical -- it starts out

RTV4080K1AA50014900('Activated'N'1''Registered'N'0'

-- ToddLarason - 22 Jun 2002

If the md5hash doesn't match the Auth tree, or the signature doesn't match the md5hash, it's treated as if there's no authorization available, and the unit is disabled until a network connection is made and a valid auth tree can be retrieved.

-- ToddLarason - 10 Dec 2002