[mythtv] [Q]: can someone point me to where myth "decides" if a stream is encrypted or not?

[Emmanuel]

Hi all,
I actually want to do the following: there is one sat channel here which 
is free that is no decryption is required whereas most channels are 
encrypted. The problem is that this stream is flagged in the dvb tables 
as encrypted and then myth tries, rightly so, to decrypt which does not  
work. SO my question is where is the code where the stream is detected 
as needing decryption and how can I permanently change that (I could 
even write a patch with a button in the setup to ask for that if others 
need that sort of broken tables work-around).
TIA
Bye
Manu