Now you have told me this I can help !!!
The software which you got with your TDK is tied to TDK. Meaning that you cannot use it with any other Manufacturers CDRW only TDK's own brand. And as for a Ser!al number for the Nero 18.104.22.168 the only way you will get one Legally is to purchess one from Ahead!!
You Say " I don't want to pay again to unlock the software, because I have actually paid it already when I bought the TDK-drive. "
I am sorry to say but you bought it to work with the TDK and it works if you want Nero to work with another CD Writer you will have to purchess the full version as the TDK version is an OEM tied to TDK Writers. And you didn't pay for it it came free with the Writer. So I hope this clears things up.
Life is a bitch and then you marry one !!!!!
It's Nice to be Important!!!
But it's more Important to be NICE!!!