CAM help!

[tezenoy]

I have a Technotrend DVB-C 2300 OT Premium card, with a Common Interface and a Nagravision CAM Module.
the encrypted channels are encrypted with Nagravision here.
The Common Interface works, it identifies the protection and it identified that a Nagravision card has been inserted.
I still cannot see encrypted channels.
people told me that it's because the smartcard is "married" to the digital reciever with a serial number and I need to change the "nagra boxkey" in the CAM to the digital reciever's serial number and then it will work.
I know how to change the code, but,
the format of the boxkey in the cam goes like this: 00 00 00 00-00 00 00
I have a "Conditional Access Number (CA)" and "NDS Serial Number" from my digital reciever.
in other formats tho -
conditional access number from digital reciever is ** **** **** **
mac address from digital reciever is **:**:**:**:**:**
and nds serial number is CE***************
what should I insert as the Nagra boxkey in the CAM settings?
please help, I would really appreciate it.